Communications

Emergency Radio Procedures

• Use the distress frequency (Channel 0) for immediate assistance. This is the standard channel used in emergencies.
• Repeat your message if no response is received. Ensure that your signal is being transmitted clearly and consistently.
• Provide detailed information about your location, situation, and needs. Include coordinates, number of people involved, and any medical conditions or injuries.
• Stay on the frequency until help arrives. Do not change channels unless instructed by a rescue team.
• Monitor other frequencies for updates or instructions from authorities. Stay informed about the status of your situation and any changes in the rescue plan.

Important Notes:
• Keep your voice steady and avoid panic when transmitting.
• If you are unable to communicate, use visual signals (e.g., mirrors, flares) to attract attention.

Objective: Interrupt an ongoing conversation to communicate an urgent message.

Steps:
1. Begin your transmission with the words "Priority! Priority!" or "Break Break."
2. This signals that your message is more urgent than the current conversation.
3. Clearly state your callsign and the nature of your message.
4. Keep your communication as brief and to-the-point as possible to minimize disruption.

Notes:
• Use this method only in emergencies, as it may be considered rude or disruptive otherwise.
• Be prepared for other users on the channel to express frustration due to the interruption.
• Always clarify that you are interrupting for a valid reason.

Objective: Adjust the RF gain to ensure clear and undistorted signal reception.

Procedure:
1. Start by setting the RF gain to maximum.
2. Gradually reduce the RF gain until you achieve the best sound quality.
3. If the RF gain is set too high, signals from nearby or strong stations may become distorted or intermittent.
4. Be cautious: if a weak signal calls in and the RF gain is turned down, it may not be heard.
5. Learn which stations on your network require higher or lower RF gain settings through experience.
6. Always begin with maximum RF gain and adjust as necessary for each station.

Do not run your aerial directly under, over, or parallel with electric light or other wires.

Details:
• This can cause signal interference and potential electrical hazards.
• Route the aerial away from power lines and other conductive materials.

Procedure:
1. Transceivers powered by solar-charged batteries should be disconnected from the battery when not in use.
2. This precaution is necessary to prevent lightning strikes on solar panels from being conducted through the battery and into the transceiver.
3. Ensure that this procedure is followed consistently, especially during thunderstorms or periods of high electrical activity.

Procedure:
1. Always disconnect the transceiver from the aerial after use.
2. Never use the transceiver during a thunderstorm.
3. Ensure that the radio operator has been given these instructions and understands their importance.
4. Display these instructions in a prominent position, using as many languages as necessary to ensure clarity for all users.
5. After disconnecting the aerial, it can be connected to earth or left "floating" (not connected to anything), but it should never be left within 30 cm of the transceiver.

Procedure:

1. Define the protocols for initiating emergency communications during a crisis or unexpected event.
2. Determine the specific frequencies and methods to be used in an emergency situation.
3. Identify who is responsible for activating emergency communication procedures.
4. Ensure all personnel are trained on these procedures and understand their roles during emergencies.
5. Document the procedures clearly and ensure they are accessible to all relevant individuals.

Note: Emergency communications must be reliable and swift to prevent delays in critical decision-making.

Procedure:

1. Use radio communication at longer ranges than conventional operations due to the dispersed nature of military operations in northern regions.
2. Consult the *Communication Supplement on Facilities North of 60°* prepared by Northern Region Headquarters (NRHQ) for guidance on communication facilities.
3. Utilize aircraft as airborne relays and air dispatch services to overcome communication challenges caused by terrain and extreme climatic conditions.
4. Ensure communication liaison with other agencies to enhance operating capabilities in the absence of infrastructure.

Procedure:

1. Contact local telephone administration: Arrange for the installation of a private wire to connect the base station and control unit.
2. Pay installation and maintenance fees: Be prepared to cover the costs associated with setting up and maintaining the line.
3. Install the private wire: Connect the base station (located on high ground) to the control unit (in an accessible location such as a building or office).
4. Test the system: Ensure that communication is clear and reliable between both ends of the connection.

Notes:
• This method is used by organizations like HM Coastguard and air traffic control authorities for long-range communications.
• The use of private wires ensures consistent and reliable signal transmission.

Objective: Ensure the transceiver is easy to maintain and modify as needed.

Procedure:
1. Check Dismantling Capability: Determine if the transceiver can be easily dismantled for servicing. Some models (e.g., TWC from U.S.A. or AEL from U.K.) use plug-in circuit boards that allow simple replacement of faulty components.
2. Fault Diagnosis and Replacement: If the transceiver uses modular boards, it may be possible to identify and replace a faulty board without requiring advanced technical knowledge. This simplifies repairs and reduces downtime.
3. Modification Potential: Assess whether the transceiver can be modified (e.g., adding an additional frequency). Some models require only a single circuit board addition (e.g., Traeger from Australia), while others may need soldering multiple components into various parts of the unit.
4. Verify Technical Documentation: Ensure that the technical manual includes full circuit diagrams, testing procedures, and numerical values for all components. This is essential for troubleshooting and modifications.
5. Request Detailed Information During Purchase: If detailed information is not included in the manual, request it as part of the purchase arrangement to avoid difficulties later.

Examples of Radio Transmissions

• Distress Call: "This is [Your Name] on Channel 0. I am in distress at coordinates [Latitude, Longitude]. Please send assistance immediately."
• Request for Help: "This is [Your Name] on Channel 0. I need help with a medical emergency at coordinates [Latitude, Longitude]."
• Location Update: "This is [Your Name] on Channel 0. I am now located at coordinates [Latitude, Longitude]. I am safe but require assistance."
• General Communication: "This is [Your Name] on Channel 0. I am traveling along the [Trail Name]. I will be passing through [Location] in approximately [Time]."

Important Notes:
• Always provide your name, location, and situation when transmitting.
• Use clear and concise language to ensure effective communication.

Procedure:

1. Inspect equipment: Take a final look around the installation site to ensure all equipment is undisturbed and in its correct position.
2. Check external cables: Verify that external cables have not been moved or disturbed by onlookers or unauthorized personnel.
3. Collect tools and test equipment: Gather all tools, test equipment, and any spare parts used during installation.
4. Document non-standard features: Make final notes in your records regarding any non-standard aspects of the installation for future reference and maintenance planning.
5. Leave operating instructions: Ensure that all necessary information (e.g., how to use the transceiver, battery care) is left with the operator or person in charge in a secure and accessible location.
6. Educate on battery usage:
- Instruct operators on how to top up the acid level in the battery.
- Explain the daily usage limits for the radio to maintain full battery charge.
7. Address common questions: Be prepared to answer questions such as:
- *Can we run a light off the radio battery in the evenings?* → No, this would drain the battery and risk damaging the equipment.
- *Can we charge another battery off the solar panel?* → No, this may compromise the power supply for the radio system.
8. Emphasize proper usage: Stress that misuse of the radio battery (e.g., using it for personal devices) can lead to damage and reduce its lifespan.
9. Ensure accountability: Make sure operators understand the importance of maintaining a reliable radio link by following proper procedures and respecting power source limitations.

Notes:
• Proper documentation and operator education are essential for long-term system reliability.
• Unauthorized use of equipment can lead to significant operational failures.

Procedure:

1. Assign multiple SELCALL codes to the individual based on their roles and locations. For example, one code may be used when they are acting as the Duty Officer, while another is used when they are serving as the First Officer.
2. Ensure that all radios associated with these roles have the correct SELCALL codes programmed in. This includes both handheld and mobile radios.
3. Carry multiple radios if necessary. In situations where an individual may be assigned to multiple roles or locations, they should carry more than one radio with different SELCALL codes programmed into them.
4. Defeat the SELCALL system on a secondary radio when needed. If the primary radio is not available (e.g., due to being inside a vehicle), use the 'def' button or menu option on another radio to disable SELCALL and allow it to receive calls intended for other codes.
5. Verify that all radios are functioning properly in different environments. For example, handheld radios may have limited range and signal strength when used inside vehicles due to metal interference, so ensure mobile radios with better antennas are available for use in such scenarios.

Procedure:

1. Identify alternative communication methods: Prepare backup systems such as direct simplex mode or other repeater locations in case the primary repeater fails.
2. Ensure redundancy: Have at least one additional repeater or a portable base station available to maintain communication during outages.
3. Train users on fallback procedures: Ensure all operators know how to switch to backup systems if the main repeater is unavailable due to power loss, theft, or technical failure.
4. Regular maintenance checks: Assign personnel to monitor and service the repeater at least every 8 hours (e.g., battery replacement, fuel top-up for generators).

Details:
• Repeaters are vulnerable to failure, so having a fallback strategy is essential.
• If the repeater fails, all radios relying on it will become non-functional until the issue is resolved.
• Users may be confused if handhelds go out of the repeater’s coverage area (e.g., driving over hills or into another town).

Objective: Monitor battery voltage levels using an LED indicator.

Procedure:
1. Replace the simple power light with a two-state LED (indicator light):
- The LED should be green when the +12V DC supply is above 11.6 volts.
- It should switch to flashing red when the voltage drops below 11.6 volts.
2. Use supporting circuitry, such as transistors and zener diodes, to operate the LED indicator.
3. A competent radio engineer can design this circuit based on a reference (e.g., Fig.5.7 in the handbook).
4. The LED used by the author was Radio Spares (RS) 588-112.
5. This setup is especially useful when operating from a battery and no voltmeter is available.

Purpose: Properly exit a radio net following established procedures.

Steps:
1. When you receive a close down order from the NCS (Net Control Station), respond in alphanumeric sequence.
2. Example of closing the net:
- NCS: NET THIS IS E3E CLOSE DOWN OVER
- Position 1: E3E (NCS) THIS IS E13 ROGER OUT
- Position 2: E3E (NCS) THIS IS E39 ROGER OUT
- Position 3: E3E (NCS) THIS IS E46 ROGER OUT
3. Ensure that all positions in the net acknowledge and exit in sequence.
4. The NCS confirms the closure of the net.

Objective: Ensure communication is maintained with higher headquarters, OPs, and within the unit.

Steps:
1. Maintain continuous communication with higher headquarters, observation posts (OPs), and within the unit.
2. Rotate roles between patrol’s Radio Telephone Operators (RTOs) to allow for:
- Continuous radio monitoring
- Radio maintenance
- Serving as runners for the PL
- Conducting other priorities of work

Procedure:

1. Be aware that high-frequency (HF) transmission and reception can be affected by magnetic storms, aurora borealis, and ionospheric disturbances, potentially causing blackouts lasting hours or days.
2. Ensure proper installation and operating procedures are followed to maintain HF communication capabilities under most conditions.
3. Address the combined effects of terrain, cold, ice, dampness, and dust on communication equipment by allocating maximum effort from operators and repair personnel for maintenance and supply.

### Turn Off Locator Beacon
• Disable the locator beacon to avoid detection.

### Keep Locator Beacon with You
• Carry the disabled locator beacon with you to supplement radio communications.

### Follow On/Off Operations Plans
• Adhere to plans or orders for on/off operations.

Conditions: Given an operational single-channel ground and airborne radio system (SINCGARS), KYK-13/TSEC with keys or AN/CYZ-10, C-11291 CM, distant station, TM 11-5820-890-10-8, TM 11-5820-890-10-3, TM 11-5820-890-10-1, ACP 125 US Suppl-1, DA Pam 738-750, FM 24-19, FM 24-18, and unit signal operation instructions (SOI) or ANCD with SOI data loaded.

Standards: Conduct a secure communications check in single channel (SC) mode with a distant station and change the radio functions using the control monitor.

### Performance Steps:

1. Perform starting procedures.
2. Load the traffic encryption key (TEK).
3. Enter the net.
- a. Use the correct procedures.
- b. Conduct a secure communications check.
4. Prepare the control monitor for operation.
5. Change the radio functions using the control monitor.
6. Exit the net.
7. Perform stopping procedures.

### Evaluation Preparation:
• Setup: Ensure that the radio set is complete and operational with (CM) installed on the radio.
• Brief Soldier: Tell the Soldier all performance measures must be completed correctly within 20 minutes. All performance measures must be done in sequence.

Operating Procedures for Radio Communications

1. Turn on the radio and check the battery level. Ensure it is fully charged before use.
2. Select an appropriate frequency channel. Use standard channels (e.g., Channel 0) for emergency communication.
3. Press the transmit button and speak clearly. Keep your voice steady and avoid shouting or whispering.
4. Wait for a response before transmitting again. Allow time for the other party to respond before sending another message.
5. Keep messages short and to the point. Provide essential information such as your location, situation, and request for assistance.
6. Monitor other channels for emergency signals. Stay alert for distress calls or other important communications.
7. Turn off the radio when not in use to conserve battery life. Avoid unnecessary transmissions that could drain power quickly.

Procedure:

1. Emphasize the selection and use of proper frequencies for radio communication in northern latitudes.
2. Use radio propagation graphs, charts, and prediction data to determine optimal frequencies for communication.
3. Employ channel evaluation techniques on northern HF circuits if equipment allows.
4. If sophisticated sounding equipment is unavailable, implement simultaneous transmissions on several frequencies (similar to the "Fleet Broadcast") from a base station to allow outstations and mobile units to select the best frequency.

Purpose: Correctly prepare and assemble a SINCGARS manpack radio for operational use.

Performance Steps:
1. Install the battery: Use one of the following batteries:
- Rechargeable: BB-390 A/U or BB-590/U
- Nonrechargeable: BB-5590/U (Lithium)
2. Connect the battery case to the radio set.
- Refer to TM 11-5820-890-10-8, page 2-14 for instructions.
3. Assemble the radio and pack frame: Assemble the pack and fasten the assembled radio into the carrying case.
- Refer to TM 11-5820-890-10-8 for assembly details.
4. Install the antenna: Connect the AS-3683/PRC to the radio.
- Refer to TM 11-5820-890-10-8, page 5-3 for instructions.
5. Connect the handset H-250/U: Connect the handset or handheld remote control radio device (HRCRD) C-12493/U.
- Refer to TM 11-5820-890-10-8, page 3-12 for instructions.
6. Preset function controls: Adjust the function controls on the radio for operation.
- Refer to TM 11-5820-890-10-8, page 5-1 for setup details.

### Locate Spare Radio and Batteries
• Find a spare radio and batteries. Keep them warm and dry.

### Use Concealment Sites
• Utilize concealment sites that optimize line of sight (LOS) for transmissions.

### Face Recovery Asset
• Orient the antenna towards the recovery asset.

### Antenna Positioning
• Keep the antenna perpendicular to the intended receiver (refer to Figure III-1).

### Avoid Grounding the Antenna
• DO NOT ground the antenna by placing fingers on it or attaching objects like a space blanket, vegetation, etc.

### Keep Transmissions Short
• Limit transmissions to 3-5 seconds maximum. Use data burst if available.

### Move After Transmission
• In combat situations, move after each transmission if possible.

### Transmit in the Blind
• If transmitting without visual contact, ensure a clear LOS towards the equator.

### Terrain Masking
• Use terrain masking to hinder enemy direction finding.

Citizen Band (CB) Radio

• Use CB radio for short-range communication. It is ideal for use in remote areas where mobile networks are unavailable.
• Ensure your CB radio is fully charged and operational before departure. Carry spare batteries if possible.
• Familiarize yourself with the operation of your CB radio. Know how to adjust frequencies, send and receive signals, and troubleshoot common issues.
• Use standard CB radio channels for emergency communication. Channel 0 (17.925 MHz) is commonly used for distress calls.

Important Notes:
• CB radio has a limited range; it may not be effective in mountainous or remote areas.
• Always use clear and concise language when communicating over the radio.

Title: Radio Operator Duties During Execution

Procedure:
1. Serve as en route recorder during all phases of the mission.
2. Record all enemy contact and report it to higher in a SALUTE format (S-Size, A-Area, L-Locations, U-Unit, T-Time, E-Equipment).
3. Report all OPSKEDs (Operational Sensitive Key Data) to higher headquarters.
4. Consolidate and record all PIR (Priority Intelligence Requirements).

Procedure:

1. Select an optimal location: Choose a spot that allows the antenna to have maximum height and line-of-sight transmission capabilities.
2. Improvise a mast if necessary: Use available materials (e.g., metal poles, trees) to elevate the antenna for better signal strength.
3. Consider staff availability: If the ideal location is not near where staff are stationed, consider using a remote-controlled base station setup.
4. Use a remote controller: Place the control unit in an area where staff can monitor and manage communications effectively.
5. Connect via cable: Use ordinary telephone cables or temporary field telephone cabling to link the base station to the remote controller.
6. For permanent setups: Arrange for a private wire from local telephone administration to connect the base station and control unit permanently.

Notes:
• The term *base station* refers to its usage, not the equipment itself.
• A modest or improvised setup can be just as effective as expensive equipment if used properly.

Objective: Set up a crossband repeater system using a dual-band mobile radio for extended communication range in canyonland terrain.

### Required Equipment:
• Dual-band mobile radio (e.g., Yaesu FT-8800)
• Power supply or 12V deep cycle battery
• Dual-band base antenna
• Coaxial feed line (coax)

### Steps to Set Up:
1. Select a Dual-Band Mobile Radio: Choose a radio that supports crossband repeating functionality, such as the Yaesu FT-8800.
2. Install Power Supply: Connect a 12V power supply or deep cycle battery (AGM/Gel cell) to the mobile radio for continuous operation.
3. **Mount Antenna and Feed Line:
- Install a dual-band base antenna on your vehicle or fixed location.
- Run coaxial feed line from the antenna to the radio, ensuring it is properly secured and routed to avoid damage.
4. Program the Radio: Use the owner’s manual to configure the mobile radio for crossband repeating functionality (e.g., set up frequency pairs for 2m and 70cm bands).
5. **Test the System:
- Power on the radio and verify that it is transmitting and receiving signals across both bands.
- Use handheld transceivers (HTs) to test communication range in canyonland terrain.

### Notes:
• This system allows your HTs to communicate over extended distances by using the mobile radio as a repeater.
• Ensure the antenna is properly tuned for optimal performance in low-foliage, canyon-like environments.

Procedure:

1. Recognize that the reflecting properties of the ionosphere are influenced by the density and uniformity of Earth's magnetic field, which is affected by solar position and radiation activity.
2. Understand that sky wave communication is subject to increased absorption and diffusion during intense auroral activity, leading to signal fading, distortion, or short-term blackouts.
3. Note that the greatest auroral activity occurs between latitudes 60° and 70° North Geomagnetic Latitude, with peak occurrences every 27–28 days, especially during fall/winter periods.
4. Be aware that all frequencies up to HF are affected by auroras but not uniformly; some frequencies will experience greater disruption than others.

Procedure:

1. Recognize that radio signals can be transmitted via two methods: ground wave (direct path between antennae) or sky wave (reflected from the ionosphere).
2. Understand that the reflective power of the ionosphere varies with frequency and time of day, which imposes limitations on usable frequencies.
3. Note that at higher frequencies (over 40 MHz), most energy passes through the ionosphere without reflection.
4. Tactical radio equipment operating in the line-of-sight band (30 MHz and upwards) is generally not affected by auroral activity, though increased ionization during auroras may occasionally extend the range of tactical FM sets.

Procedure:

1. Identify the group call SELCALL code assigned to the target individual's radio group. This is typically programmed into all radios within that specific group.
2. Send the group call SELCALL code from your transmitter. This will activate all mobiles in the designated group, opening their speakers and allowing them to hear the transmission.
3. Verbally state the callsign and name of the person required. After sending the group call SELCALL, clearly announce the individual's callsign and name so that they can identify themselves.
4. Wait for the intended recipient to respond. Once the correct individual answers, they should state the SELCALL code of the radio they are currently using.
5. Reconfigure the call to use only their specific SELCALL code. This will close off other radios in the group and allow a private conversation between you and the intended recipient.

Procedure:
1. Install gas discharge lightning arrestors into the coaxial cable between the aerial and transceiver.
2. These devices provide additional protection against lightning strikes passing through the aerial to the transceiver.
3. Ensure that the arrestor is properly connected and maintained for optimal performance.

Use a safety spark gap between the grid and the filament terminals where the plate potential is above 2,000 volts.

Details:
• This prevents electrical arcing and damage to sensitive components.
• Ensure the spark gap is properly installed and tested regularly.

Objective: Use handheld transceivers (HTs) in conjunction with a mobile repeater system to achieve long-range communication.

### Required Equipment:
• Dual-band mobile radio (e.g., Yaesu FT-8800)
• 12V power supply or deep cycle battery (AGM/Gel cell)
• Dual-band base antenna
• Coaxial feed line (coax)
• HTs (e.g., Yaesu FT-60R)

### Steps to Use:
1. Set Up Mobile Repeater System: Ensure the mobile radio is configured as a crossband repeater with dual-band operation, and that it is powered by a 12V power supply or deep cycle battery.
2. **Install Antenna and Feed Line:
- Mount a dual-band base antenna on your vehicle or fixed location.
- Connect the coaxial feed line from the antenna to the mobile radio.
3. **Program HTs for Dual-Band Operation:
- Configure your HTs (e.g., Yaesu FT-60R) to use both 2m and 70cm bands, ensuring they are set up to communicate with the mobile repeater system.
4. **Test Communication Range:
- Power on the mobile radio and HTs.
- Test communication range in canyonland terrain by transmitting from an HT and receiving on another HT via the mobile repeater system.

### Notes:
• This setup allows you to use HTs for long-range communication without needing a dedicated base station repeater.
• Ensure that both the mobile radio and HTs are properly programmed and tuned for optimal performance in low-foliage, canyon-like environments.

Procedure:

1. Use very high frequency (VHF) and microwave radio-relay equipment for short-range communication in northern latitudes.
2. Be aware that auroral reflected signals may disrupt VHF communications, especially amplitude modulated (AM) voice transmissions.
3. Prioritize the use of FM-based tactical radio sets in areas affected by auroras due to their relative immunity and potential range extension during high ionization periods.

Objective: Ensure the squelch control is set to an appropriate level for reliable reception.

Procedure:
1. Locate the squelch control on the front panel of the transceiver.
2. If the squelch is set too high, it may block weaker signals from being heard (e.g., as experienced by an aid agency in Kinshasa).
3. Adjust the squelch control to a lower level so that all desired signals can be received without interference.
4. In situations where the squelch feature is not needed, consider wiring the control permanently off:
- Remove the wire from the 'variable' arm of the control.
- Solder it to the 'squelch off' end.
5. To indicate that this modification has been made, remove the squelch control knob from the front panel.

Objective: Ensure the transceiver has a user-friendly interface suitable for its intended use.

Procedure:
1. Evaluate Control Layout: Avoid models with excessive controls or indicators that may not be used regularly. A basic SSB transceiver should have at minimum: ON/OFF, VOLUME, CLARIFIER, and CHANNEL SELECTOR (if multiple channels are available).
2. Check for Additional Features: Look for a SQUELCH control and TRANSMIT indicator, which are commonly found on most models.
3. Earphone Compatibility: Determine if the transceiver has an earphone socket or can be modified to include one. Earphones are useful for hearing weak signals in noisy environments.
4. Power Source Switching: If you plan to use both AC mains and DC battery power, check how easily the transceiver can switch between these sources (e.g., via a switch, plug change, or soldering).
5. External Power Supply Considerations: Be aware that external power supply units require interconnecting cables, plugs, and sockets, which may wear out over time and become a source of failure.

Procedure:

1. Determine who will operate the radio: Identify individuals or teams responsible for operating the station.

2. Assess time commitment: Consider how much time per day will be required to send, receive, and process messages. At small stations, this may have minimal impact on existing workloads, while at large HQ stations, it may require full-time availability.

3. Plan for staffing costs: Decide who will pay the wages of a dedicated radio operator if one is needed.

4. Train operators in advance: Ensure that personnel are trained to operate the equipment and understand procedures before deployment.

5. Provide log books: Maintain records of all messages sent and received using log books, as this is usually a legal requirement under your radio licence.

Procedure:

1. Recognize the Limitations of CTCSS: Understand that CTCSS does not provide true privacy or prevent stronger signals from overriding your transmission.
2. Assess Frequency Usage: In simplex mode, avoid using CTCSS unless you are certain that all users on the same frequency are programmed with the same tone and understand how it works.
3. Monitor for Interference: Be aware that other users may be transmitting without knowing they are on the same frequency, which can lead to missed communications or delays in emergency situations.
4. Use Alternative Methods for Privacy: If privacy is required, consider using different frequencies or more advanced systems like SELCALL (Selective Calling) instead of relying solely on CTCSS.
5. Educate Users: Ensure that all users on the same frequency understand how CTCSS works and its limitations to avoid confusion during critical communications.

Important Notes:
• CTCSS is not suitable for simplex mode in emergency or high-priority communication scenarios due to potential interference and missed messages.
• Always verify that your radio system is configured correctly and all users are aware of the limitations of CTCSS.

Procedure:
1. The radio should not be operated from a battery while the battery is being charged by any other means than by a solar charger.
2. This is because excess voltage, e.g., from a vehicle alternator with a faulty regulator, can damage the transceiver.

Procedure:

1. Determine PEP of the Transceiver: Identify the Peak Envelope Power (PEP) rating from the transceiver's specifications.
2. Calculate Average Input Power:
- Use the formula: *Average power = 2/3 × PEP*.
- Example: For a 150 watt PEP transceiver, average power = 2/3 × 150 = 100 watts.
3. Determine Current Requirement from Battery:
- Use the formula: *Current (amps) = Power (watts) / Voltage (volts)*.
- Example: For a 150 watt PEP transceiver with a 12 volt battery, current = 100 watts / 12 volts ≈ 8.3 amps average.
4. Account for Peak Current:
- The transceiver may require up to twice the average current during transmission (e.g., 18-20 amps peak for a 150 watt PEP transceiver).
5. Receiving Power Consumption: During reception, power consumption is significantly lower (typically 0.2 to 0.5 amps for a 150 watt PEP transceiver).

Procedure:

1. Assess signal quality: Monitor the HF link for signal fading and noise levels.
2. Adjust baud rate: Set a lower baud rate (e.g., 300 bauds) to accommodate potential signal degradation on HF links.
3. Implement error correction: Ensure data systems are equipped with error detection and correction mechanisms to handle missed or corrupted packets automatically.
4. Use voice link for packet radio: If necessary, use a voice radio link to carry packet radio, but limit the baud rate based on the quality of the link.
5. Monitor performance: Continuously monitor the link's performance and adjust parameters as needed to maintain reliable data transmission.

Procedure:

1. Understand Repeater Functionality: A repeater system receives a signal on one frequency and retransmits it on another, allowing communication over greater distances.
2. Program the Repeater with a CTCSS Tone: Select a unique CTCSS tone that will be used by all mobile units communicating through the repeater. Program this tone into the repeater's settings.
3. Ensure Mobile Units Are Programmed Correctly: All mobile units must be programmed with the same CTCSS tone as the repeater to ensure successful communication.
4. Verify Repeater Activation Settings: Configure the repeater to only activate when a mobile unit transmits the programmed CTCSS tone. This prevents random interference from activating the repeater unnecessarily.
5. Test the System Thoroughly: Conduct tests with multiple users on the same frequency to ensure that the repeater activates correctly and only responds to signals with the programmed CTCSS tone.
6. Monitor for Interference: Even with CTCSS, stronger signals from other sources may still interfere with communication. Regularly monitor the system for any signs of interference or malfunction.

Important Notes:
• Proper configuration of the repeater and mobile units is essential to ensure reliable communication.
• Always verify that all users understand how the CTCSS tone works in conjunction with the repeater system.

Modems (MOdulator/DEModulator) are used to transmit data over audio channels such as telephone lines or radio links by modulating and demodulating signals.

### Implementation Steps
1. Ensure that the modem at both ends of the communication link is compatible with the same signaling system.
2. Use a pair of tones for modulation, ensuring that the transceiver can handle the specific tone frequencies used in the chosen signaling system.
3. If using a modem with an SSB (Single Sideband) transceiver:
- A tuning aid is necessary to adjust the clarifier and set the tones at the correct pitch.

### Compatibility Notes
• Modems are compatible with AM, FM, and SSB transceivers depending on their design.
• Different signaling systems use various tone pairs and durations; ensure compatibility between both ends of the link.

Procedure:

1. Locate the 'def' button or menu option on your radio. This allows you to temporarily disable the SELCALL system on your current radio.
2. Press the 'def' button or navigate through the menu to defeat SELCALL. This will allow your radio to receive calls intended for other radios with different SELCALL codes.
3. Listen for incoming calls by ear. Since the SELCALL system is disabled, you must rely on spoken communication to identify if a call is intended for you.
4. Verify the caller's identity and purpose. If you are not the intended recipient, inform them that they should use the correct SELCALL code or speak directly to the person who is available.
5. Re-enable SELCALL when no longer needed. Ensure the system is reactivated to maintain security and prevent unintended communication with other stations.

Objective: Ensure the transceiver is compatible with the actual voltage available at the installation site.

Procedure:
1. Assess Actual Voltage: Check the real voltage supply at the intended installation location, as it may differ from nominal values (e.g., 220V AC may drop to 185V during certain times).
2. Verify Transceiver Specifications: Confirm whether the transceiver requires a fixed voltage or can operate within a range of voltages (e.g., 210–240V).
3. Consult Manufacturer: Contact the manufacturer to determine the actual AC voltage range over which the transceiver will function, as this may be broader than what is stated in the specification.
4. Test Performance at Lower Voltages: Be aware that performance (e.g., power output) can decrease at lower voltages. For example, a transceiver rated for 13.6V DC may produce significantly less PEP when operated from a 12V battery.
5. Select Compatible Transceiver: Ensure the chosen transceiver is compatible with the actual voltage available to avoid performance issues or failure.

Procedure:

1. Assess the reason for transmitting. This will determine whether you are calling for help or communicating within your group.
2. If calling for help (life-threatening situation):
- Transmit with enough power to ensure aid can hear your call.
- Keep power levels low enough to conserve battery life for extended use, especially if you need to guide aid to your location.
3. If communicating within your group:
- Use the lowest possible power level that still allows effective communication.
- Stay within legal limits of your radio equipment (e.g., type accepted frequencies).
4. Be aware of frequency regulations:
- Use radios that are type accepted for specific bands (e.g., AIR band vs. Marine band). Note: Some radios may be type accepted for multiple bands, but this is rare.
- Amateur radio equipment is not type accepted and must follow ham regulations when used on amateur bands.

Procedure:

1. Identify the primary communication frequency that will be used for regular operations.
2. Select a backup frequency to use in case the primary frequency becomes unavailable or compromised.
3. Ensure both frequencies are compatible with all communication devices within the convoy.
4. Document the selected frequencies and ensure they are communicated to all relevant personnel.

Note: This step is critical for maintaining uninterrupted communication during operations.

Procedure:

1. Understand PEP and Average Power Relationship: The Peak Envelope Power (PEP) of an SSB transceiver is approximately 3 times the average power output.
2. Estimate Range Requirements:
- For communication up to 300 km, a 25 watt PEP transmitter may be sufficient.
- For ranges up to 1,000 km, a 100 watt PEP transmitter is typically required.
3. Consider Interference Factors:
- In practice, due to interference and crowded channels, many users opt for higher power transmitters (up to 1,000 watts illegally).
4. Select Appropriate Power:
- Based on the Questionaire data, 74% of transceivers used are 100 watts PEP or above.
- If unsure about operating with less than 100 watts, select a transceiver capable of producing at least 100 watts PEP.
5. Power Adjustment:
- You can reduce the power output of a 100 watt transceiver if needed but cannot increase the power of a lower wattage model without additional equipment.

To establish an effective radio network timetable:

1. Determine the time slots for different departments or functions within your organisation. For example:
- 0900 to 1000: Education
- 1000 to 1100: Medical
- 1200: General Rendezvous for all other matters.

2. If the network covers a large area, subdivide it on a regional basis:
- Allocate specific times for each region to handle its own business.
- Schedule times when regions can contact central HQ control for other matters.

3. Avoid changing an existing timetable unless you are certain that the channel will be free at the new time:
- Listen on the channel for several days to determine when it is in use.
- Ensure changes do not disrupt ongoing operations.

Procedure:

1. Select a permanent location for the transceiver and its battery that is secure.
2. Install burglar bars and reliable locks to protect the equipment from theft or unauthorized access.
3. Avoid moving the transceiver and/or battery during the day to a safe storage place at night, as this can lead to damage due to constant movement and careless handling.
4. Ensure that the location is dry, even if it requires covering the equipment and desk with a plastic sheet, especially in areas prone to tropical rain.
5. Avoid rooms where other people are working or talking as background noise will be picked up by the microphone and transmitted.
6. Use sound-absorbing screens or telephone hoods (like those used in airports) to reduce echo and background noise.
7. Consider placing the equipment in a separate room for privacy, if possible, to prevent conversations from being overheard.
8. If privacy is not possible, have the operator wear earphones to prevent others from overhearing the conversation.

Warnings/Notes:
• Moving the transceiver frequently can cause damage and inconvenience.
• Acid burns from improper handling of vented batteries can occur, as seen in one case where a lady's clothing was spoiled by acid.
• Radio conversations are not private; anyone with a suitable receiver can listen on your frequency.

Overview: Setting up and managing an HQ station is crucial for effective radio communication within a group.

Procedure:
1. Assign Operator Role: Either the administrator of the group should operate the radio themselves or delegate the task to another person who will act as a message relayer.
2. Consider Advantages and Disadvantages: If the admin operates the radio, they can answer queries and resolve issues immediately. However, this may add extra workload to an already busy schedule. Alternatively, delegating the role requires ensuring that the operator has enough time to perform the task properly.
3. Operator Qualifications: The operator must be fluent in the language used for transmission, able to read and take down messages accurately over the air, and not expected to answer questions immediately but rather pass them on correctly to the right person.
4. Time Commitment: Operating a radio station is time-consuming. For example, in Zaire, an operating session between HQ and 4 outlying stations typically took over 1 hour, including preparation, message exchange, logging, and follow-up actions.

Notes: The operator must be trained to handle messages accurately and maintain proper records. This ensures that all communications are clear and efficient.

Steps:

1. Follow the correct procedures to exit the net as specified in the training material.
2. Ensure that all communications links are properly closed and secured before exiting.
3. Confirm that the radio system is no longer transmitting or receiving on the network.

Procedure:
1. If the radio installation has a 'fail to battery' facility (see para.3.2.1.2.), then the importance of switching the transceiver off as well as disconnecting the mains must be stressed.
2. With a 'fail to battery' facility, when the mains plug is removed without switching off at the transceiver controls, the transceiver will automatically be connected to the battery and so remain on.

Procedure:

1. Understand CTCSS Functionality: Continuous Tone Controlled Squelch System (CTCSS) allows users to share a frequency without hearing other users' transmissions.
2. Program Your Radio with a Unique CTCSS Tone: Select a specific tone from the available range and program it into your radio. This tone is emitted continuously while transmitting but not heard by the receiver's loudspeaker.
3. Ensure Compatibility Across Devices: All radios that need to communicate on the same frequency must be programmed with the same CTCSS tone for successful communication.
4. Monitor for Interference: Even though CTCSS prevents hearing other users, it does not block stronger signals from overriding your transmission. Monitor for potential interference from stronger stations on the same frequency.
5. Use Caution in Simplex Mode: In simplex mode, CTCSS may lead to missed communications if another user is transmitting without knowing you are on the same frequency. It is generally advised against unless weaker interfering signals are expected.
6. Verify Repeater Settings: If using a repeater system, ensure that it is configured to only activate when your mobile unit transmits the programmed CTCSS tone. This prevents random interference from blocking the repeater.

Important Notes:
• CTCSS does not provide true privacy or prevent stronger signals from overriding weaker ones.
• Users may experience confusion if they do not understand how CTCSS works, especially in emergency situations where timely communication is critical.
• Always be aware that other users on the same frequency can hear your transmissions even if you cannot hear theirs.

Procedure:
1. Allow several hours for aerial erection to ensure proper installation.
2. Whenever possible, have a competent person install the aerial.
3. Avoid incorrect installations such as:
- Erecting the aerial at 90 degrees to the required direction
- Tying the coaxial cable to the top of a pole
- Cutting pieces off the aerial during installation to make it fit between posts
4. Ensure that the aerial is installed in the correct length and orientation for optimal performance.
5. Avoid placing the aerial too close to the ground or other obstructions.

To maintain an accurate message log book at each station:

1. Use a bound log book rather than loose leaf pages, as required by some governments.
2. Use duplicate pads that provide one page to be left in the book and a second carbon copy on a tear-out page for passing messages.
3. Before starting contact, write down the operator's name, date, and time across the page.
4. Create columns in the log book for:
- To/From: Indicate whether the message is incoming or outgoing.
- Message: Record the content of the message.
- Action: Document the response taken to the message.
5. Assign serial numbers to each message by the HQ operator and inform other stations of these numbers for future reference.
6. Ensure that a person at each station is responsible for ensuring all messages are passed on, even if they are not the operator.
7. After each contact, have the log book circulated among personnel so recipients can acknowledge receipt and enter new messages in their own words.
8. Avoid sending messages based on the operator's interpretation; instead, record them as written to prevent errors.
9. If operators write messages down rapidly on scrap paper first, ensure they are copied into the log book as soon as possible while the details are fresh in memory.
10. Make the log book available for review at a specific time and place each day.

Overview: Having a stand-by operator is essential to ensure continuity in radio communication.

Procedure:
1. Designate a Stand-by Operator: Choose an experienced and reliable individual who can take over the duties of the primary operator when necessary.
2. Training Requirements: The stand-by operator must be trained in operating procedures, controls, and message handling to ensure they are prepared for emergencies or unexpected absences.
3. Regular Practice: The stand-by operator should operate the radio at least once a month to maintain familiarity with the equipment and procedures.

Notes: This ensures that there is always someone available who can step in without delay or confusion, maintaining the integrity of communication during critical times.

Procedure:

1. Use the minimum power required to communicate. This reduces airwave pollution and conserves battery life.
2. Limit transmission range by using low power, especially in emergency situations where you may not want everyone to hear your message.
3. Avoid unnecessary high-power transmissions, as they can interfere with other radio operators and drain batteries faster.
4. Consider the context of communication:
- In life-threatening emergencies, use enough power to ensure aid can receive your call but keep it low enough to conserve battery for extended use.
- For non-life-threatening group communications, keep power levels as low as possible while still maintaining effective communication within the group.
5. Be aware of legal limitations:
- Use radios that are type accepted for specific frequency bands (e.g., AIR band vs. Marine band).
- Amateur radio equipment is not type accepted and must follow ham regulations when used on amateur bands.

Objective: Reduce interference from nearby transmitters while maintaining communication quality.

Procedure:
1. If interference is caused by nearby transmitters not on the same frequency, reduce the RF gain as much as possible while still being able to hear the station you are communicating with.
2. Compensate for any loss in volume using the audio gain or volume control.
3. Ensure that communication remains clear and audible despite interference.

Objective: Facilitate rapid maintenance of a transceiver by using plug-in circuit boards.

Procedure:
1. Ensure that all main components are on plug-in circuit boards, allowing technicians to replace or repair them quickly during field visits.
2. For high-current connections (e.g., from the power supply), modify soldered wire connections to use plugs and sockets:
- Use high current snap-on car electrical type connectors for the power supply connection.
3. This modification reduces the need for soldering during repairs and improves reliability in remote or field environments.

Procedure:

1. Prepare for operation: Remove all test equipment before starting the operating procedure.
2. Follow setup instructions: Switch on the transceiver, connect cables as described in the manual, and ensure all connections are secure.
3. Train operator: Allow the operator to perform all operations (e.g., sending and receiving messages) under supervision.
4. Test communication: Make a radio contact with another station at a prearranged time to verify functionality.
5. Observe operator technique: Check how the operator sends, receives, and records messages during testing.
6. Shut down properly: After testing, instruct the operator to switch off the transceiver and disconnect cables as necessary.
7. Consider local context: In remote or culturally sensitive areas (e.g., African villages), be prepared for large crowds gathering around the equipment. Ensure only trained operators handle the transceiver.
8. Train in advance: Conduct training sessions in a quiet environment before the first formal contact to avoid distractions and ensure proper understanding.

Notes:
• Operator training is critical, especially in areas with limited technical knowledge or where local populations may be excited by new technology.
• Ensure operators are familiar with procedures to prevent accidental damage or misuse of equipment.

Procedure:
1. The operator should be told never to operate when lightning can be seen and thunder heard.
2. Always disconnect the aerial and power cables after use because of danger from lightning.
3. If he understands that lightning can come through the cables to the radio and damage it or strike the operator, he will take more notice of the instructions.

Procedure:
1. The operator should be told never to smoke or use a candle or naked light near a battery.
2. This is because hydrogen gas is released from a vented battery (i.e., a car type battery) when it is being charged.
3. If connected to a solar panel, the battery will be continually charged throughout the day.

Objective: Ensure clear and effective communication by following proper transmitting techniques.

Procedure:
1. Press the transmit button before beginning to speak into the microphone.
2. Cease speaking immediately before releasing the transmit button.
3. Speak clearly and at a reasonable pace; do not shout, as this can distort the signal.
4. If your transceiver has a transmit light, observe it during pauses in speech to ensure that it turns off when you stop talking.
5. Adjust either your voice volume or proximity to the microphone so that the transmit light corresponds with your speech patterns.
6. If the distant station reports poor reception, avoid shouting into the microphone as this may activate Automatic Level Control (ALC) circuits and reduce intelligibility.
7. Use a trial-and-error method to improve communication: ask the other operator if they receive you better in one transmission or another after adjusting your position or technique.

Title: Radio Operator Duties During Planning

Procedure:
1. Enter the net (communications network) at the specified time.
2. Ensure that all frequencies, COMSEC fills, and net IDs are preset in squad/platoon radios.
3. Inform the SL and PL of changes to call signs, frequencies, challenge and password, and number combination based on the appropriate time in the ANCD (Annex to the Net Control Document).
4. Ensure the proper function of all radios and troubleshoot any deficiencies, reporting them to higher headquarters if necessary.
5. Weatherproof all communications equipment to ensure it remains operational under adverse conditions.

Procedure:

1. Keep messages clear and concise, avoiding unnecessary information.
2. Speak into the microphone at a moderate pace; avoid shouting to prevent distortion.
3. Begin by stating the callsign of the station you are addressing, followed by your own callsign.
4. Finish each message clearly with both callsigns repeated, followed by the word "Over" or "Over to you."
5. Avoid long pauses or hesitations during transmission, as they may be mistaken for the end of a message or equipment failure.
6. Ensure that all messages are understood on both sides; if in doubt, have the receiver read back the message to confirm accuracy.
7. In noisy or difficult reception conditions, it is essential to request the sender to spell out words using the phonetic alphabet (see para. 7.3.5 for details).
8. Never transmit medical terms or names of people and places without confirming their spelling if there is any doubt in understanding.

Procedure:

1. Gather Equipment: Ensure you have an HT (Handheld Transceiver) and a dual-band mobile radio (which may be in an automobile).
2. Configure Frequencies:
- The HT should transmit on UHF-A.
- The Mobile unit must receive on UHF-A and simultaneously retransmit on VHF-A.
3. Base Repeater Configuration: The base repeater should receive on VHF-A and retransmit simultaneously on VHF-B.
4. Receiving Options:
- Option 1: The HT receives the signal directly from the base repeater on VHF-B.
- Option 2: The mobile unit receives VHF-B, retransmits it simultaneously on UHF-B, and the HT receives on UHF-B (this option is harder on the mobile equipment and may be legally questionable).
5. Considerations:
- This method allows communication with a main 'base' repeater even if you are inside a building or blocked by topography.
- Be aware that Option 2 increases wear and tear on the mobile unit and may not be entirely legal.

Facsimile (fax) machines transmit static black-and-white images over audio channels by frequency modulating an audio sub-carrier.

### Implementation Steps
1. Connect the fax machine to a transceiver that supports audio channel transmission.
2. Ensure the transceiver is set up with the correct modulation settings:
- Use a nominal 1900 Hz sub-carrier frequency for transmission.
- White areas are transmitted at 2300 Hz, and varying shades of grey to black are transmitted from 2300 Hz down to 1500 Hz.
3. Ensure the receiving end has a compatible fax machine or receiver capable of demodulating the signal and converting it back into an image.

### Performance Notes
• Transmission quality depends on the stability of the audio channel and proper tuning of the sub-carrier frequency.

Selective calling systems allow you to send individual signals to specific stations within a network, similar to how a telephone works by ringing a bell or buzzer at the target station.

### Requirements
• A selective calling unit with a unique calling code for each station in the network (especially for HQ station).
• Units that can both transmit and receive codes (for all stations except the HQ, which may have additional capabilities).

### Implementation Steps
1. Assign a unique calling code to each station within the network.
2. Install selective calling units on all transceivers:
- Some units are plugged into an auxiliary socket of the transceiver.
- Others are battery-powered and must be held in front of the microphone while transmitting.
3. Ensure that the transceiver is switched on and has its aerial connected to receive calls.
4. Leave the transceiver switched on with the loudspeaker off during periods when you expect to receive calls.
5. Safety Precautions:
- Disconnect the aerial and other external components when lightning is near.

### Compatibility Notes
• Tone-based calling units are best suited for AM and FM transceivers but can be used on SSB if tuned within ±500 Hz of the desired frequency.
• Pulse width modulated tone units work with all transceiver types (AM, FM, SSB).

### Performance
• The calling signal is transmitted for approximately 5 to 10 seconds.
• These units are designed to minimize false alarms.

Procedure:

1. Select the appropriate transportable unit: Choose a transportable radio with higher output power than handheld units, as they are designed for better communication range and reliability.

2. Ensure proper battery setup: Transportables require larger and heavier batteries due to their increased power requirements. Make sure these batteries are fully charged and securely installed in the unit.

3. Use an external antenna when stationary: While transportable units come with a built-in rubber duck helical antenna for mobility, this should only be used while on the move. When stationary, connect a temporary external antenna to maximize signal strength and range. The external antenna should be clipped to a fitting in a good position (e.g., elevated or unobstructed location).

4. Integrate battery charger: Many transportable units have built-in battery chargers. Ensure the charger is functioning properly and not misplaced, as it is crucial for maintaining operational readiness.

5. Avoid common mistakes: Do not rely solely on the internal antenna when stationary, as this reduces the effectiveness of the transportable unit. Also, ensure that all components (including the charger) are accounted for during transportation to prevent loss or misplacement.

Overview: Outlying stations require trained operators to ensure effective communication with the HQ station.

Procedure:
1. Operator Qualifications: The operator at an outlying station must be familiar with radio operation and able to take their turn on the air with other stations as instructed by the controlling (HQ) station.
2. Training Requirements: It is advisable for multiple individuals in the group to be trained in radio operations so that they can handle emergencies or take over if needed.
3. Consistency in Operation: Ideally, one regular operator should be assigned daily duties that include operating the radio to maintain consistency and reliability in communication.

Notes: Operators must be prepared to follow instructions from the HQ station and ensure that messages are transmitted and received accurately.

Objective: Reduce interference by switching between upper (USB) and lower (LSB) sidebands when necessary.

Procedure:
1. If a station is experiencing interference on one sideband, check if the other sideband is free from interference and not in use by another station.
2. Switch to the unused sideband and inform the other stations of the change.
3. After communication is complete, return the USB/LSB switch to its normal position for subsequent contacts.

Overview: Proper time management is essential when operating an HQ station to ensure efficient communication.

Procedure:
1. Preparation Time (5 minutes): Obtain the keys, go to the room, unlock it, connect cables, and set up the radio controls for contact.
2. Message Exchange (20 minutes): Send and receive messages between HQ and outlying stations.
3. Log Book and Documentation (10 minutes): Ensure that all log books are completed correctly and make written copies of any necessary messages for distribution.
4. Shut Down Procedures (5 minutes): Switch off the radio, disconnect cables, and lock up the room securely after operations.
5. Follow-Up Communication (20 minutes): Contact individuals who have received messages or have questions to ensure clarity and resolution of issues.

Notes: This breakdown is based on a real-world example from Zaire and should be adapted as needed depending on operational requirements.

Morse code is a method of transmitting messages using short and long signals (dots and dashes) over radio channels.

### Implementation Steps
1. Ensure both the sending and receiving stations have operators who can send and receive Morse code at a minimum speed of 8 words per minute for effective communication.
2. Equip each station with:
- A morse key to manually transmit signals (dots and dashes).
- A tone oscillator if needed to generate the correct audio tones for transmission.
3. Tune the transceiver to an appropriate frequency that supports Morse code transmission.
4. Transmit messages by sending a sequence of dots and dashes corresponding to letters, numbers, and symbols as defined in the international Morse code standard.
5. At the receiving end, decode the received signals into readable text using a Morse code interpreter or trained operator.

### Performance Notes
• Morse code is especially useful when signal strength is low or there is significant interference on the channel.
• It remains a reliable method of communication in situations where voice transmission is not feasible.

Procedure:

1. Ensure your radio has a SELCALL code assigned. Each station must have a unique SELCALL code programmed into its circuit board.
2. Send the SELCALL code before transmitting your message. This will activate only the receiver associated with that specific SELCALL code, allowing you to communicate without interference from other users.
3. Listen for confirmation of receipt. If the receiving station is equipped with a revertive calling feature, it will provide an indication (e.g., a light or sound) at the sending end confirming that the SELCALL was received and the alert horn has been triggered.
4. Use spoken communication if necessary. If the recipient is not near their radio or has defeated the SELCALL system, they may need to hear your message by voice. In this case, you should verbally state the callsign and name of the person required after sending the SELCALL code.
5. Close other radios during conversation. Once the intended recipient answers, they can identify the SELCALL of the radio they are using, allowing the call to be set up again while silencing other radios in the group.

Procedure:

1. Identify the need for a repeater: Use this option if a private wire is not practical or there are no staff available to manage traffic.
2. Install a repeater: Set up a repeater in a location that can effectively relay signals between distant points.
3. Ensure coverage area: Position the repeater where it can cover both the base station and the target communication areas.
4. Test signal strength and clarity: Verify that the repeater is functioning properly and providing reliable communication.

Notes:
• Repeaters are useful in remote or sparsely populated areas where direct connections may be difficult to establish.
• They can extend the range of a base station significantly.

Procedure:

1. Assign a dedicated operator: Have someone permanently monitor the channel to repeat messages for handheld radios.
2. Ensure continuous coverage: Use the base station frequently to relay communications between different locations.
3. Maintain situational awareness: Keep an ear on the channel at all times, especially in high-traffic or emergency situations.

Notes:
• Base stations are often used as central hubs for relaying messages across a network.
• Even simple equipment can be highly effective if properly utilized.

Objective: Adjust the clarifier control to achieve the best sound quality based on individual hearing.

Procedure:
1. Locate the clarifier control on your transceiver.
2. Turn the control until the pitch or sound is clear and comfortable for you.
3. Note that the optimal setting may vary between individuals, so adjust it according to your personal hearing preferences.
4. Repeat this process for each station you listen to, as different stations may require different settings.

Procedure:

1. Each station should be assigned an official call sign by the licensing authority of its country (e.g., 9SD67 or 9SD47).
2. In practice, only the last part of the call sign is used for communication (e.g., 67 and 47).
3. A list of all call signs in the network should be kept at each station.
4. All operators must use the assigned call signs instead of place names to avoid confusion.
5. One station, typically the HQ station, should have control over the network and issue instructions to other stations.
6. When calling a specific station, the operator should state the called station’s number first, followed by their own (e.g., *67 from 47*).

Procedure:

1. Teach all individuals who own a radio how to use it properly with specific emphasis on the following:
- Listening before transmitting.
- Disabling CTCSS and DCS features.
- Disabling scrambling functions.
- Speaking in plain language.
- Directing all communications to a specific person or unit.
- Responding only to known persons.
- Making general calls when necessary.
- Ensuring enough batteries are on hand for at least seventy-two hours of continuous use.
- Keeping the radio and batteries in an accessible location, away from areas prone to damage during earthquakes or storms.
- In advance warning of an emergency, putting the radio on your belt or clipping it to clothing.
- Carrying packs of extra batteries in pockets for emergencies like building collapses.
- Before a disaster, contacting other neighborhood members and checking in with Block Captains who should have paper and pencil ready to record names and addresses.
- Having a current map with address numbers, telephone numbers, and family names recorded on it.
- After a disaster, Block Captains should contact every person that checked in and attempt to reach those who did not.
- Block Captains should prioritize persons in distress by allowing them to check in before others.
- Persons in distress should begin transmitting immediately if their vocal cries for help are not heard. Use the format: “This is [Name] on [Location]. Please help me.” Stop transmitting when called or asked to do so, and indicate injuries if necessary.
- If unable to speak, develop a signaling method (e.g., tapping or rubbing the radio against an object) that is understood by all neighbors. Use one tap for yes, two taps for no, as a last resort.
- Prevent open-microphone conditions by switching to an alternate channel if necessary.

Procedure:

1. Assign a Block Captain to each neighborhood who is responsible for calling all residents on the radio during and after a disaster.

2. The Block Captain should verify the welfare of people in homes and buildings around them.

3. Ensure that Block Captains are trained and equipped with radios for effective communication.

Procedure:

1. Recognize Radio's Reach: Despite concerns about its effectiveness compared to digital media, radio continues to be a critical communication channel for reaching the public.

2. Review Research Data: According to 2019 research from Nielsen and Westwood One, over 90% of Americans are reached weekly by radio, with TSL on AM/FM being 10 times greater than that of streaming platforms.

3. Consider Radio in Vehicles: In the aftermath of a nuclear detonation, radios in cars and trucks may become essential tools for seeking emergency AWN broadcasts due to communication disruptions.

4. Avoid Exaggerating Access: Caution is needed to avoid overstating the access provided by AM/FM radio for purposes of AWN dissemination.

5. Plan for Continued Use: Given its reliability, radio should be incorporated into emergency planning and alerting strategies.

Procedure:

1. Designate a neighborhood communications volunteer to set up FRS radios for individuals who may not be able to do it themselves.

2. This ensures that all members of the community have access to functioning communication devices during emergencies.

3. The volunteer should provide guidance on proper setup and usage.

Unintended interference or distress calls can hinder rescue efforts during emergencies:

1. Train users to avoid panic-driven behavior, such as broadcasting random signals or calling out unnecessarily.
2. Ensure that all individuals using radios are aware of the importance of following communication protocols and not causing interference with ongoing rescues.
3. Provide clear instructions on how to use the push-to-talk function correctly to avoid accidental transmissions.
4. Encourage users to stay calm and communicate only when necessary, especially in high-stress situations.

Procedure:

1. CERT teams should not be responsible for designing or re-designing communication systems.

2. This work should be handled by disaster planners who are already familiar with local emergency protocols.

3. CERT volunteers should focus on rescue and public welfare tasks.

Collaborate with local businesses and their radio users to enhance emergency communication capabilities:

1. Identify local business radio channels that are in use by companies with large fleets or high-powered simplex radios.
2. Coordinate with these businesses to utilize their repeaters or frequencies during emergencies for broader coverage.
3. Ensure that all parties involved understand the importance of following communication protocols and avoiding interference.
4. This collaboration can significantly improve the effectiveness of emergency response efforts in affected areas.

Procedure:

1. In large buildings, assign Floor Captains and alternates who carry radios for emergency communications.

2. Every building should have a communications plan integrated with its evacuation plan.

3. Not every employee needs to carry an FRS radio, but key personnel involved in the neighborhood disaster plan should do so.

Procedure:

1. Encourage as many volunteers as possible to take CERT (Community Emergency Response Team) training.

2. This ensures that individuals responding to calls for help can do so with confidence and without injury.

3. CERT training should focus on rescue and public welfare, not on designing communication systems.

Wilderness protocol is a method used to conserve battery life and improve the chances of rescue during emergencies:

1. All stations (fixed, portable, or mobile) should monitor Personal Radio Service frequencies every three hours.
2. Stations with sufficient power resources should monitor for five minutes starting at the top of every hour, or continuously.
3. This protocol helps ensure that trapped individuals who may not be able to operate a radio properly can still be heard.
4. It also reduces unnecessary battery drain and minimizes interference during critical rescue operations.

Procedure:

1. Identify amateur radio operators in the neighborhood and include them in communications planning.

2. These individuals can serve as a link between the neighborhood and public safety agencies, especially in areas with long distances between neighborhoods.

3. Ensure that amateur radio operators are prepared to assist during emergencies.

Procedure:

1. Ensure that the neighborhood is included in a multi-hazard functional plan for its jurisdiction.

2. Maintain up-to-date contact information, including addresses and phone numbers, for every local neighborhood.

3. This can be facilitated through Neighborhood Watch or Neighborhood Association meetings conducted by local police jurisdictions.

Procedure:

1. Neighbors who want to license in the GMRS (General Mobile Radio Service) should pay the license fee and purchase a base station and mobile radio with an external antenna.

2. These individuals can act as a link between the neighborhood and designated resource points up the communication chain.

3. Ensure that all equipment is compatible with the GMRS frequency range for effective long-range communication.

Procedure:

1. Maritime communities should consider using GMRS and FRS channels for communication.

2. VHF maritime channels cannot be legally used on land, and may be busy with maritime distress activities.

3. This ensures that maritime communities can communicate effectively without interference or legal issues.

Criminal activity can exploit emergency radio systems, so it is important to be vigilant:

1. Be aware that individuals with criminal intent may attempt to fake distress calls or identify the location of law enforcement and search teams for looting purposes.
2. Train users to report suspicious behavior such as unusual transmissions, false distress signals, or unauthorized use of frequencies.
3. Ensure that all radios used in emergency situations are monitored by trained personnel who can verify the authenticity of distress calls.
4. Coordinate with local law enforcement to monitor and respond to potential threats related to radio misuse during emergencies.

If you have a scanner or other wideband receive radio, follow these steps to program frequencies:

1. Access a frequency database: Visit a website such as [http://www.radioreference.com/modules.php?name=RR](http://www.radioreference.com/modules.php?name=RR) or a similar resource. This is a user-maintained database with public frequencies used by police, fire, municipal, county, and state agencies.

2. Identify relevant frequencies: Look for frequencies that may be useful now or in the future. Many modern radios have several hundred memory slots, so you should be able to store plenty of frequencies.

3. Program the frequencies: Save any selected frequencies into your radio's memory for easy access during emergencies.

Note: Some larger municipalities use 'trunked' or digital radio systems. This means that a specific group may switch between different frequencies or channels. While this can make monitoring difficult with simple ham radios, you can still monitor transmissions if you know the list of frequencies used by an agency. In some cases, conversations will switch to another channel, but you may be able to get the gist from the few seconds available.

Alternative option: Listen to neighboring safety frequencies such as smaller municipalities or county sheriff’s channels. You may also find interdepartmental 'aid' frequencies that allow different departments/cities to communicate and call for assistance.

Scanning all frequencies increases the likelihood of detecting individuals who may be trapped and unable to operate a radio properly:

1. Use radios with squelch codes disabled (CTCSS and DCS settings should be turned off).
2. Continuously scan through available frequencies to listen for any distress signals or calls for help.
3. This method is especially useful in areas where individuals may not know how to use a radio effectively.
4. Ensure that all radios used are set to wideband mode to capture the broadest range of signals.

Procedure:

1. Develop a simple method of wearing the radio on the belt, around the neck, or clipped to clothing.

2. This is especially important for elderly and sick individuals who may be at higher risk during emergencies.

3. The method should ensure that the radio remains accessible and secure in all situations.

Objective: Choose the most suitable radio channels for your neighborhood’s communication needs.

Steps:
1. Scan FRS and GMRS channels to monitor current activity in your area.
2. Select the quietest available frequencies for local use (e.g., FRS channel 14 for very-local communications).
3. Avoid busy GMRS repeater output channels that may be used by higher-powered radio stations.
4. Consider using CTCSS/DCS tones to reduce interference and improve communication clarity on selected channels.

Procedure:

1. Choose an FRS radio that uses regular alkaline batteries instead of rechargeable ones.

2. This is crucial because during a power outage, you may not have access to electricity needed to recharge batteries.

3. Ensure the selected model can be easily replaced with standard alkaline batteries for continuous use in emergencies.

Action: Set the public expectation of FRS channel one as an emergency radio frequency to summon assistance on demand.

Details:
• OEMs (Office of Emergency Management) warn that public safety may not be able to respond to telephone calls immediately after a disaster.
• Calling for help or rescue on a Family Radio Service portable radio does not increase your chances of emergency assistance.

Procedure:

1. A neighborhood should standardize on a particular make and model of FRS radio for individuals with no prior experience using radios, as this reduces the likelihood of operational errors during emergencies.

2. This standardization ensures that all members can use the same equipment without confusion or difficulty.

3. It is especially important for those who may be likely to have problems using their radios due to age, health conditions, or lack of familiarity with technology.

Procedure:

1. Test the neighborhood’s radio system at least four times a year.

2. A good time for testing may be just before a Neighborhood Watch meeting or local disaster preparedness meeting.

3. Encourage informal use of radios throughout the year to ensure familiarity with the equipment.

Training is essential for effective use of FRS and GMRS radios during emergencies:

1. Provide basic training sessions to teach users how to operate the push-to-talk function, change channels, and monitor frequencies.
2. Emphasize the importance of disabling CTCSS and DCS settings to ensure that all users can communicate with each other without interference.
3. Train individuals on battery management techniques, such as conserving power by limiting radio use during non-critical times.
4. Encourage participation in community training programs or CERT (Community Emergency Response Team) initiatives for hands-on experience.

Radio direction finding techniques can help locate individuals who are trapped or in dangerous locations:

1. Train local responders and volunteers in basic radio direction finding methods, such as using signal strength indicators and triangulation.
2. Coordinate with experienced groups like the Civil Air Patrol or Amateur Radio Service volunteers for assistance during emergencies.
3. These techniques are especially useful when individuals are trapped inside buildings or other structures where visual identification is not possible.
4. Ensure that all personnel involved in rescue operations have access to direction finding equipment and training.

Procedure:

1. Do Not Expect Immediate Help: Possession of a two-way radio does not guarantee an instant or reliable response to a call for help.

2. Avoid False Assumptions: Some families may believe that having a radio ensures immediate assistance, but this is not always the case.

3. Prepare For Isolation: Emergency aid may be unavailable due to impassable conditions, flooding, power outages, or lack of public safety resources.

Procedure:

1. Recognize Limitations Based On Physics: The range of a radio is determined by the laws of physics, particularly how UHF radio waves propagate.

2. Ignore Marketing Claims: Be aware that marketing claims about radios do not override the physical limitations of signal propagation.

3. Plan Accordingly: Understand that even with the best equipment, communication may be limited based on environmental factors.

Procedure:

1. Explain Capabilities And Limitations: Emergency OES/OEM officials must inform the public about what FRS and GMRS can and cannot do during a disaster.

2. Assess Available Resources: Officials should evaluate:
- Are there GMRS repeaters in your community? What are their coverage areas?
- How many families have access to these systems?
- Where are the base stations located? Are they connected to emergency power?
- Will the owners make the repeaters available for use during emergencies?

3. Identify Local GMRS Licensees: Determine if there are GMRS licensees in your community who may be able to assist with communication during a disaster.

4. Ensure EOC Readiness: The Emergency Operations Center (EOC) should have licensed GMRS operators available to man a base station during emergencies.

Procedure:

1. Prioritize Cellular And Landline Phones: Use conventional methods like cellular or landline telephones for communication during emergencies, as they are familiar to the public.

2. Accept Possible Outages: Be prepared for these systems to be temporarily unavailable after a disaster.

3. Use Two-Way Radios As A Backup: In the time period immediately following a disaster and before conventional systems are restored, two-way radios can be valuable for local communication.

To monitor ham repeaters and stay informed during emergencies:

1. Access a ham repeater database: Visit a website such as [http://www.artscipub.com/repeaters/](http://www.artscipub.com/repeaters/) or a similar resource. This site lists ham repeaters across the US.

2. Identify emergency-related repeaters: Pay particular attention to any repeaters that are listed as OEM (Office of Emergency Management), EMA (Emergency Management Agency), ARES (Amateur Radio Emergency Service), or RACES (Radio Amateur Civil Emergency Service) affiliated.

3. Monitor the frequencies: Even if you are not a ham radio operator, listening to ham operators can provide valuable information during emergencies. These repeaters often serve as communication hubs for emergency management and response teams.

Procedure:

1. When using a radio to communicate with neighbors, use plain language instead of codes.

2. Avoid the use of ten codes or other shorthand that may lead to misunderstandings.

3. This ensures clear and effective communication during emergencies.

Procedure:

1. Use radio codes instead of plain language only if you can guarantee there will be no misunderstandings.

2. This is particularly important in high-stress or chaotic situations where clarity is essential.

3. Ensure that all users understand the specific codes being used and their meanings.

Procedure:

1. Primary Use For Neighbors: Two-way radios are primarily intended for communication between neighbors during and after a disaster.

2. Support CERT Volunteers: These systems can help CERT volunteers or others provide immediate search and rescue assistance or allow neighbors to assist each other.

3. Do Not Rely On Radios For Emergency Aid: Understand that emergency aid may not be available to everyone, even if they have a radio.

Procedure:

1. Enable Communication In Remote Areas: While not guaranteed, having a two-way radio may allow officials to communicate with individuals in isolated areas during emergencies.

2. Coordinate With Emergency Management: Officials should be prepared to use these systems to reach people who are cut off from other forms of communication.

Procedure:

1. Avoid using call tones on FRS radios as they serve no useful purpose during emergencies.

2. These tones can make the radio seem like a toy, which may reduce its effectiveness in serious situations.

3. Encourage users to communicate directly and clearly without relying on call tones.

Objective: Prevent common mistakes that can hinder communication during emergencies.

Procedure:
1. Do not rely on complex radios with multiple features, as they are harder to use under stress.
2. Avoid using CTCSS or DCS tones, which:
- Are difficult for most users to set up
- Are marketed as privacy features but do not provide real privacy
- Often cause interference with other users if not used correctly
3. Never assume others will listen before transmitting; this can lead to accidental interference.
4. Avoid using radios that require menus or push-button functions, as these are confusing and hard to master in an emergency.
5. Do not use FRS radios with tone-coded squelch features during emergencies, as they may prevent communication entirely.

Notes:
• Radios should be intuitive and easy to operate without instruction manuals or prior knowledge.
• Feature-rich radios are often less reliable in high-stress situations.

Communications Planning for Collective-Protection Shelters

1. Use wire communication systems to communicate with those in adjacent shelters or immediately outside the shelter.
2. If radios are required for communications with adjacent units at a distance:
- Remote the antennas away from the shelter.
- Place antennas so that a hill or other obstacle is between the antennas and the enemy, if possible.

Objective: Choose FRS radios that are simple and effective for emergency communication.

Procedure:
1. Choose FRS-only radios to avoid the need for a license.
2. Avoid tone-coded squelch options, as they:
- Complicate setup
- Cause compatibility issues between different manufacturers
- Interfere with GMRS repeaters when used on channels 8 through 14
- Make it harder to communicate quickly during an emergency
3. Remove call tone features from radios, as they are rarely useful and often used to annoy others.
4. Opt for a simple one-button scan function for ease of use.
5. Avoid feature-rich models, as they tend to be more complex and less reliable in emergencies.
6. Prioritize simplicity and voice communication over advanced features.

Notes:
• Manufacturers should focus on developing radios that are easy to use, especially for non-experts.
• Radios with reduced complexity are better suited for emergency situations like CERT teams or neighborhood crime prevention groups.

Procedure:

1. Determine the communication needs of your group:
- Consider the distance between users (e.g., hunting in large areas may require greater range).
- Decide if you need additional features such as privacy codes, multiple channels, or detachable antennas.
2. Choose between FRS-only and FRS/GMRS radios:
- FRS-only radios are ideal for short-range communication (up to 2 miles) and do not require a license. They are typically less expensive but offer fewer features.
- FRS/GMRS radios provide greater range (up to 10 miles under ideal conditions), more channels, and may include advanced features like privacy codes. However, they require a GMRS license from the FCC.
3. Ensure all radios in your group are of the same model or compatible models:
- Radios from different brands may not support shared features such as privacy codes.
4. Consider channel availability:
- FRS offers 14 channels; GMRS offers 23 channels.
- More channels increase the likelihood of finding a clear frequency, especially in urban areas.
5. Check for additional features:
- Look for radios with durable construction, long battery life, and weather resistance if used outdoors.
6. Verify local regulations:
- Some states may prohibit the use of two-way radios during deer hunting or other activities.

Overview: The Family Radio Service (FRS) is a license-free very-short-range radio service suitable for local communication.

Steps:
1. Use channels one through seven, which are shared with the General Mobile Radio Service (GMRS). GMRS licensees may use up to 5 watts effective radiated power on these channels, allowing FRS radios in a neighborhood to be useful if one licensed resident communicates with many local hand-held units.
2. Use channels eight through fourteen exclusively for FRS communication.
3. Be aware that FRS is limited to one-half watt output, and manufacturer claims of long-range communication are exaggerated.
4. Antenna height significantly affects range, as FRS radio waves travel line of sight. Communication over tens of miles may be possible from high altitudes (e.g., on a mountain or building roof).
5. Be prepared for severe interference in urban areas, especially due to intentional call tones used to annoy others.
6. Avoid using FRS radios as children’s toys, and ensure that parents know who their children are communicating with, particularly with text-messaging models like Hasbro radios.
7. Use FRS radios for very-local communication around a neighborhood or home, especially before, during, and after disasters.
8. Be aware of FCC rules: FRS radios cannot be connected to external antennas, telephone systems, or store-and-forward repeaters.

Emergency services often use standardized alphabets for clear communication. Here are two common systems:

### Law Enforcement Alphabet (NATO/Military/International)
| Letter | Word |
|--------|------|
| A | Adam |
| B | Boy |
| C | Charles|
| D | David|
| E | Edward|
| F | Frank|
| G | George|
| H | Henry|
| I | Ida |
| J | John |
| K | King |
| L | Lincoln|
| M | Mary |
| N | Nora |
| O | Ocean|
| P | Paul |
| Q | Queen|
| R | Robert|
| S | Sam |
| T | Tom |
| U | Union|
| V | Victor|
| W | William|
| X | X-ray|
| Y | Young|
| Z | Zebra|

### NATO/Military/International Alphabet
| Letter | Word |
|--------|----------|
| A | Alpha |
| B | Bravo |
| C | Charlie |
| D | Delta |
| E | Echo |
| F | Foxtrot |
| G | Golf |
| H | Hotel |
| I | India |
| J | Juliet |
| K | Kilo |
| L | Lima |
| M | Mike |
| N | November |
| O | Oscar |
| P | Papa |
| Q | Quebec |
| R | Romeo |
| S | Sierra |
| T | Tango |
| U | Uniform |
| V | Victor |
| W | Whiskey |
| X | X-ray |
| Y | Yankee |
| Z | Zulu |

Use: These alphabets are used to avoid confusion when spelling out names, locations, or other words over radio communication. Always use the correct alphabet based on the context (e.g., law enforcement vs. military).

Procedure:

1. Choose a channel:
- Select an unused frequency (channel) that is not being used by others outside your group.
- In crowded areas, use one of the additional channels available on FRS/GMRS radios to avoid interference.
2. Establish communication protocols:
- Agree on a schedule for check-ins or updates with your group (e.g., every 30 minutes during hunting).
- Set up specific codes or phrases for emergencies (e.g., 'Deer down' or 'Need help').
3. Maintain radio battery life:
- Use radios with long-lasting batteries, and carry spare batteries if needed.
- Turn off the radio when not in use to conserve power.
4. Monitor for interference:
- If communication is unclear or interrupted, switch to a different channel.
5. Keep the radio accessible:
- Store the radio in a waterproof case or pouch if used in wet environments (e.g., hunting near water).
6. Practice using the radio before heading into the field:
- Ensure all users are familiar with the controls and features of the radios.

Overview: The Family Radio Service (FRS) is only legal in the United States and Canada.

Steps:
1. Do not use FRS radios outside the U.S. or Canada, as it is illegal in most other countries.
2. If you need to use FRS frequencies abroad, obtain prior permission from local authorities, though this is rare and usually only granted for specific purposes.
3. Be aware that some individuals have used FRS radios illegally in foreign countries without authorization.

Objective: Optimize shortwave listening during daylight hours.

Procedure:
1. Avoid peak daytime hours (10 A.M. to 3 P.M.) as signal quality is typically poorest during this time due to reduced broadcasting activity.
2. Use the following bands for daytime listening:
- 13m band: Results vary, but worth trying. Sometimes extremely good around sunrise and sunset.
- 16m band: Similar to 19m band.
- 19m band: Best overall daytime band. May also be good at night in summer months. Sometimes extremely good around sunrise and sunset. Sometimes good at night in the summer.
- 22m band: Similar to 19m band.
- 25m band: Best around sunrise and sunset. May be good mid-day in some areas.
- 31m band: Similar to 25m band.
3. Experiment with local conditions as results may vary by region and time of day.

Objective: Optimize shortwave listening during nighttime hours.

Procedure:
1. Use the following bands for nighttime listening:
- 25m band: Similar to 31m band.
- 31m band: Good all night everywhere. Often extremely good at sunrise and sunset. Good results often start about an hour before sunset.
- 49m band: Best overall night band.
- 41m band: Similar to 49m band. Good all night worldwide.
2. Optimal times for listening: Around sunset and sunrise, as signal quality is typically best during these periods.
3. Be prepared for variability in signal strength depending on location and atmospheric conditions.

Overview: Use of FRS radios by hunters may be regulated in some states.

Steps:
1. Check local hunting regulations to determine whether the use of two-way radios is allowed for coordinating hunts.
2. In some states, using FRS radios to coordinate hunting is considered unsportsmanlike conduct, and may result in penalties or disqualification from hunting activities.
3. If permitted, ensure that all users are aware of the rules and use radios responsibly.

Objective: Provide contact details for shortwave directories.

Procedure:
1. For 'Passport to World Band Radio':
- Address: International Broadcasting Services, Ltd., Box 300 Penn's Park, Pennsylvania 18943
- Phone: (215) 598-9018
- Website: www.passband.com
2. For 'Monitoring Times':
- Address: Grove Enterprises, 7540 Hwy 64 West Brasstown, NC 28902
- Phone: (704) 837-9200
- Website: www.monitoringtimes.com
3. For 'Popular Communications':
- Address: CQ Communications, 76 North Broadway Hicksville, NY 11801
- Phone: (516) 681-2922
- Website: www.popular-communications.com

Objective: Provide customer support information for Grundig radios.

Procedure:
1. Contact Grundig North America for assistance with your radio:
- United States: 1-800-872-2228 (M-F 9am-4pm PST)
- Canada: 1-800-637-1648
- Worldwide: 650-903-3866
2. Email support: customersvc@grundigradio.com
3. Visit the official website: www.grundigradio.com for additional information and resources.

Objective: Locate and use shortwave directories to identify broadcasts.

Procedure:
1. Acquire a comprehensive shortwave directory, such as Passport to World Band Radio or other similar resources.
2. Use the directory to find:
- Countries broadcasting on shortwave.
- Programming details (e.g., broadcast times, languages used, target areas).
- Frequencies associated with specific broadcasts.
3. Consult the 'Worldwide Broadcasts in English' chapter for information about English language programming.
4. Refer to the 'Voices from Home' chapter for non-English language broadcasts.
5. Use 'The Blue Pages' chapter for a frequency-by-frequency listing to identify which country you are listening to.

Objective: Understand how the two-electrode vacuum tube functions as a detector.

Procedure:
1. When electric oscillations pass through the closed circuit (including the secondary of the tuning coil, variable condenser, filament, and plate), they cause:
- The positive part of the wave to pass easily through the tube.
- The negative part to be blocked or cut off, as shown in Fig. 71C.
2. This rectification process converts oscillations into pulsating direct currents that can flow through and affect a telephone receiver.
3. If the received oscillations are modulated by a telephone transmitter:
- They carry larger impulses of direct current from the B battery along with them.
4. These currents then flow through the headphones, allowing you to hear the signal.

Notes:
• The tube acts as both a detector and an amplifier, depending on the circuit configuration.

Objective: Understand how a vacuum tube functions as an amplifier.

Procedure:
1. Connect the filament and plate of a three-electrode vacuum tube to batteries, but do not connect the grid initially.
2. Heat the filament until it glows (incandescence), causing electrons to be emitted.
3. The electrons are stopped by the grid due to its negative charge, preventing them from reaching the plate.
4. Apply a small positive voltage to the grid:
- This allows more electrons to reach the plate, increasing current flow through the tube and headphones.
5. A small variation in the grid's voltage (from positive to negative) causes large variations in the plate current, effectively amplifying the signal.

Notes:
• The amplifier tube functions as a variable relay, allowing feeble currents from incoming waves to control larger currents through the headphones.

Objective: Understand the principles behind autodyne and heterodyne receiving sets.

Procedure:
1. Autodyne (Self-Heterodyne) Receiver:
- Use a single vacuum tube to generate both frequencies required for heterodyning.
- Tune one circuit to match the frequency of incoming waves, and another slightly out of step by approximately 1,000 oscillations per second.
2. Heterodyne Receiver:
- Use two separate circuits:
- One tuned to the incoming wave frequency.
- Another tuned with a slight difference (e.g., + or - 1,000 Hz) to produce beats.
3. The interaction of these frequencies creates beats, which are heard as rising and falling tones in the headphones.
4. These beats are produced by the detector tube acting on the pulsating currents from the B battery.

Notes:
• Autodyne systems use a single vacuum tube to generate both frequencies, while heterodyne systems require two separate tubes or circuits.

Objective: Understand how a simple vacuum tube receiving set works.

Procedure:
1. Heat the filament to incandescence, causing it to emit electrons.
2. When electric waves impinge on the aerial wire:
- They create oscillations in the primary coil of the loose-coupled tuning coil (as shown in Fig. 41B).
3. These oscillations induce similar high-frequency currents in the secondary coil and variable condenser.
4. The alternating positive and negative voltages from these oscillations are impressed on the grid of the vacuum tube.
5. This causes electrons to strike the plate intermittently, creating a conducting path for the B battery current.
6. The larger direct current from the B battery then flows through the detector tube and headphones, allowing you to hear the signal.

Notes:
• This setup is used in basic vacuum tube receivers before more advanced configurations like regenerative or heterodyne systems are employed.

Objective: Understand how the three-electrode vacuum tube functions as both a detector and an amplifier.

Procedure:
1. The grid, placed between the filament and plate, controls the number of electrons flowing from the filament to the plate.
2. Electrons must pass through holes in the grid wires before reaching the plate.
3. If the grid is charged with a higher negative voltage than the filament:
- It stops most electrons from reaching the plate, reducing current flow.
4. If the grid is charged with a positive voltage:
- More electrons reach the plate, increasing current flow through the tube and headphones.
5. When used as a detector:
- Oscillations in the circuit change the grid's voltage alternately between negative and positive (as shown in Fig. 72C).
6. This variation allows the B battery current to rise and fall in unison with the oscillating currents, amplifying the signal.

Notes:
• The three-electrode tube is more sensitive than the two-electrode type due to the grid's control over electron flow.

Objective: Construct a tuning coil for a wireless telegraph station.

### Materials Required:
• Cardboard tube (about 3 inches in diameter)
• Two square heads
• No. 24 insulated copper wire
• Shellac
• Two pieces of one-quarter inch square brass rod
• Slider (as shown in drawing)
• Binding posts

### Steps:
1. Assemble the Tube and Heads:
- Mount a cardboard tube between two square heads.

2. Wind the Coil:
- Wind No. 24 insulated copper wire around the tube.
- Apply shellac to the coil to prevent loosening of the wire.

3. Attach Brass Rods and Slider:
- Fasten two pieces of one-quarter inch square brass rod between the heads.
- Make a slider as shown in the drawing and attach it to the rods.
- Scrape off the insulation in the path of the slides.

4. Secure Binding Posts:
- Attach binding posts to the rods and coil ends.

### Notes:
• The tuning coil is essential for adjusting the frequency of the wireless telegraph station.

Objective: Create an effective ground connection for a wireless telegraph station.

### Materials Required:
• Copper wire
• Cold water pipe (for stationary sets)
• Metal rod or metal netting (for portable sets)

### Steps:
1. For Stationary Sets:
- Solder a copper wire to a cold water pipe to establish the ground connection.

2. For Portable Sets:
- Drive a metal rod into the ground to create a ground connection.
- Alternatively, sink metal netting into a body of water for grounding.

### Notes:
• A proper ground connection is essential for the effective operation of the wireless telegraph station.

Objective: Learn how heating metal can release electrons for vacuum tube operation.

Procedure:
1. Heat a piece of metal until it reaches incandescence (bright red or white-hot).
2. The heat causes atoms in the metal to collide with great force, knocking off electrons from their orbits.
3. These freed electrons are now available for conduction and can be attracted by other elements placed nearby.
4. To ensure these electrons do not return to the original metal:
- Apply a positive charge to another piece of metal placed in proximity.
5. Place both metals inside a vacuum-sealed bulb.
6. The positively charged metal will attract the freed electrons, creating an electron flow between them.

Materials Needed:
1. Single coil tuner with three clips
2. .002 mfd. fixed condenser (3,000 volts)
3. Three .001 mfd. condensers
4. Adjustable grid leak
5. Hot-wire ammeter (reads to 2.5 amperes)
6. Buzzer
7. Dry cell
8. Telegraph key
9. 100 volt plate vacuum tube amplifier
10. 6 volt storage battery
11. Rheostat
12. Oscillation choke coil
13. Panel cut-out with single-throw, double-pole switch and fuse sockets

Steps:
1. Tuning Coil Construction:
- Use two 3/4-inch thick wood disks (5 inches in diameter) and four hard rubber strips (1/2-inch thick, 1 inch wide, 5-3/4 inches long).
- Screw the strips to the disks.
- Wrap about 25 turns of No. 8 or 10 Brown & Sharpe gauge bare copper wire around the form with a 1/8-inch space between each turn.
- Attach three terminal clips to different turns of the coil.

2. Condensers:
- Use one .002 mfd. fixed condenser rated for 3,000 volts (e.g., U C-1014 Faradon).
- Use three .001 mfd. fixed condensers (e.g., List No. 266).

3. Aerial Ammeter:
- Install a hot-wire ammeter that reads to 2.5 amperes.
- Connect it in the aerial wire system, either on the aerial or ground side (ground is usually more convenient).

4. Buzzer and Dry Cell:
- Use an ordinary buzzer connected in series with a dry cell for energizing the buzzer.

5. Telegraph Key:
- Mount a telegraph key on a composition base (e.g., $1.50 model).

6. Vacuum Tube Oscillator:
- Use a 100 volt plate vacuum tube amplifier (e.g., UV-201 by RCA).
- Connect it to a 110-volt direct current source or five B batteries.

7. Storage Battery and Rheostat:
- Use a 6-volt storage battery with a 20–40 ampere-hour capacity (e.g., $13.00 model).
- Connect a rheostat to regulate the filament heating current.

8. Oscillation Choke Coil:
- Wind 100 turns of No. 28 Brown & Sharpe gauge double cotton covered magnet wire on a cardboard cylinder (2 inches in diameter, 2-1/2 inches long).

9. Panel Cut-Out:
- Use a panel cut-out with a single-throw, double-pole switch and fuse sockets.

Wiring Diagram Connections:
• Connect one post of the ammeter to the aerial wire and the other post to one end of the tuning coil.
• Connect clip 1 to one terminal of the .002 mfd. condenser and the other post of this condenser to ground.
• Connect the end of the tuning coil that leads to the ammeter with one end of the .001 mfd. grid condenser, and the other end of this condenser to the grid of the vacuum tube.
• Connect the telegraph key, buzzer, and dry cell in series and shunt them around the grid condenser.
• Connect the plate of the tube with one end of the .001 mfd. blocking condenser and the other end of this condenser to clip 2 on the tuning coil.
• Connect one end of the filament to the + electrode of the storage battery, the - electrode to one post of the rheostat, and the other post of the rheostat to the other end of the filament.
• Connect clip 3 with the + side of the storage battery.
• Connect one end of the choke coil to the conductor leading to the plate and the other end of the choke coil to one of the taps on the switch on the panel cut-out.
• Connect the + electrode of the storage battery to the other switch tap and place a protective condenser across the 110-volt feed wires between the switch and the choke coil.
• Finally, connect the lamp cord from the socket to the plug fuse taps.

Materials Required:

• Alternating current transformer
• Wireless telegraph key
• Fixed, rotary, or quenched spark gap
• Condenser
• Oscillation transformer
• Electrolytic interrupter (if using direct lighting current)

Steps to Assemble the Set:

1. Select Components:
- Choose an alternating current (AC) transformer rated at 1/4, 1/2, or 1 kilowatt depending on your needs. These transformers deliver secondary currents of 9,000, 11,000, and 25,000 volts respectively.
- Use a wireless telegraph key (preferably brass with silver contact points for better performance).
- Select a fixed, rotary, or quenched spark gap depending on your preference. A fixed spark gap is simpler to use, while a rotary or quenched type may offer more control over the signal.
- Choose a condenser that can withstand high potentials; one section is sufficient for most applications unless you are using larger transformers.
- Use an oscillation transformer made of 20 to 30 turns of No. 8 or 9 hard-drawn copper wire on a slotted insulated form (costs about $5.00).
- If your home has direct lighting current instead of alternating current, you will also need an electrolytic interrupter to rapidly make and break the primary circuit of the transformer.

2. Mount the Apparatus:
- Place the set on a stable table or bench where it will not be moved.
- Position the telegraph key in the middle of the table, slightly forward.
- Mount the alternating current transformer to the left and back, ensuring that its primary and secondary coils are properly aligned with the core.
- Place the battery behind the transformer (if using a dry cell setup) or connect it directly to your home power supply if using an AC transformer.
- Locate the tuning coil (oscillation transformer) to the right of the transformer and behind the key.

3. Wire the Low Voltage Circuit:
- Use No. 12 or 14 insulated copper wire for the low-voltage circuit.
- Connect all dry cells in series: connect the zinc terminal of one cell to the carbon terminal of the next, continuing until all are connected.
- If using an AC transformer, ensure that it is properly connected to your home power supply (110 volts direct or alternating current).

4. Wire the High Tension Circuits (Oscillation Circuit):
- Use either bare or insulated copper wire for high-tension circuits, ensuring it does not touch any part of the apparatus except its designated posts.
- Connect one post of the secondary coil of the transformer to a post on the spark gap and another post to a post on the condenser.
- Connect the other post of the condenser to the lower spring clip of the tuning coil and also to ground.
- Connect the middle spring clip of the tuning coil to a post on the spark gap, and connect the top clip to the aerial wire.

5. Final Checks:
- Ensure all connections are secure and insulated where necessary.
- Verify that the spark gap is properly aligned and that the condenser is correctly shunted across the interrupter (if using an electrolytic interrupter).
- Test the set by sending a signal through the telegraph key to ensure it operates as expected.

Steps to Assemble a Cheap Receiving Aerial (Two-wire Aerial):

1. Gather the following components:
- Two wires (approximately 20-30 feet long)
- Insulated wire connectors
- Ground connection point
2. Connect one end of each wire to an insulated wire connector.
3. Attach both insulated wire connectors to a central support point (e.g., a tree or pole).
4. Connect the other ends of the wires to the ground connection point.
5. Ensure all connections are secure and insulated.
6. Test the aerial by connecting it to a receiving set and adjusting for optimal reception.

Notes:
• Use high-quality wire for better signal reception.
• Adjust the length of the wires if needed for optimal performance.

Steps to Assemble a Good Aerial (Inexpensive Version):

1. Gather the following components:
- One long wire (approximately 50-70 feet long)
- Insulated wire connectors
- Ground connection point
2. Connect one end of the wire to an insulated wire connector.
3. Attach the insulated wire connector to a central support point (e.g., a tree or pole).
4. Connect the other end of the wire to the ground connection point.
5. Ensure all connections are secure and insulated.
6. Test the aerial by connecting it to a receiving set and adjusting for optimal reception.

Notes:
• Use high-quality wire for better signal reception.
• Adjust the length of the wire if needed for optimal performance.

Steps to Assemble a Regenerative Amplification Receiving Set:

1. Gather the following components:
- Loose coupled tuning coil
- A battery potentiometer
2. Connect the loose coupled tuning coil to the battery potentiometer.
3. Ensure all connections are secure and insulated.
4. Test the set by adjusting the tuning coil and listening for signals.

Notes:
• Use a three-coil loose coupler for better regenerative amplification.
• Adjust the battery potentiometer to optimize signal reception.

Materials Required:

• Spark-coil
• Battery of dry cells
• Telegraph key
• Spark gap
• High-tension condenser
• Oscillation transformer

Steps to Assemble the Set:

1. Select Components:
- Choose a spark coil that gives at least 1-inch sparks (costs about $8.00). A 2- or 4-inch spark coil is preferable for more power.
- Use dry cells for the battery: 5 cells for coils with less than 1-inch spark, 6–8 cells for 1–2 inch coils, and 8–10 cells for 3–4 inch coils.
- Select a telegraph key (preferably made of brass with silver contact points for better performance).
- Use a fixed or stationary spark gap (costs about $1.00), consisting of zinc plugs (electrodes) mounted on threaded rods with knobs.
- Choose a high-tension condenser that can withstand high potentials; one section is sufficient for 2-inch sparks, and two sections are needed for 2–4 inch sparks.
- Use an oscillation transformer made of 20 to 30 turns of No. 8 or 9 hard-drawn copper wire on a slotted insulated form (costs about $5.00).

2. Mount the Apparatus:
- Place the set on a stable table or bench where it will not be moved.
- Position the telegraph key in the middle of the table, slightly forward.
- Mount the spark coil to the left and back, ensuring the vibrator end is accessible for easy adjustment.
- Place the battery behind the spark coil.
- Locate the tuning coil (oscillation transformer) to the right of the spark coil and behind the key.

3. Wire the Low Voltage Circuit:
- Use No. 12 or 14 insulated copper wire for the low-voltage circuit.
- Connect all dry cells in series: connect the zinc terminal of one cell to the carbon terminal of the next, continuing until all are connected.
- Connect the carbon terminal of the last cell to one post of the telegraph key and the zinc terminal of the first cell to a primary post on the spark coil.
- Connect the other primary post of the spark coil to the remaining post of the telegraph key to complete the low-voltage circuit.

4. Wire the High Tension Circuits (Oscillation Circuit):
- Use either bare or insulated copper wire for high-tension circuits, ensuring it does not touch any part of the apparatus except its designated posts.
- Connect one post of the secondary coil of the spark coil to a post on the spark gap and another post to a post on the condenser.
- Connect the other post of the condenser to the lower spring clip of the tuning coil and also to ground.
- Connect the middle spring clip of the tuning coil to a post on the spark gap, and connect the top clip to the aerial wire.

5. Final Checks:
- Ensure all connections are secure and insulated where necessary.
- Verify that the spark gap is properly aligned and that the condenser is correctly shunted across the vibrator.
- Test the set by sending a signal through the telegraph key to ensure it operates as expected.

Steps to Assemble a Simple Telegraph and Telephone Receiving Set:

1. Gather the following components:
- Crystal detector
- Tuning coil
- Fixed and variable condensers
- Telephone receivers
2. Connect the crystal detector to the tuning coil.
3. Attach the fixed and variable condensers to the tuning coil circuit.
4. Connect the telephone receivers in parallel with the tuning coil.
5. Ensure all connections are secure and insulated.
6. Test the set by adjusting the tuning coil and listening for signals.

Notes:
• Use high-quality components for better reception.
• Adjust the variable condensers to tune into desired frequencies.

Steps to Assemble a Simple Transmitting Set (No. 1):

1. Gather the following components:
- Spark coil
- Battery
- Telegraph key
- Spark gap
- Tuning coil
- High-tension condenser
2. Connect the battery to the spark coil circuit.
3. Attach the telegraph key in series with the battery and spark coil.
4. Connect the spark gap across the secondary of the spark coil.
5. Attach the tuning coil in parallel with the spark gap circuit.
6. Connect the high-tension condenser in series with the tuning coil.
7. Ensure all connections are secure and insulated.
8. Test the set by sending signals through the telegraph key.

Notes:
• Use a high-quality spark coil for better transmission.
• Adjust the tuning coil to optimize signal transmission.

Procedure:

1. Obtain three inductance coils and connect them in parallel for the loose coupler.
2. Use a variometer to adjust coupling between the coils as shown in Fig. 53 and Fig. 54.
3. Incorporate variable condensers into the circuit to allow tuning across different frequencies.
4. Mount the components on a wooden or insulated base for stability.
5. Connect the loose coupler tuner to the receiving set's input stage as illustrated in Fig. 49 (A) and (B).
6. Test the tuner by connecting it to an antenna and adjusting the variable condensers until a clear signal is received.

Notes:
• Ensure all coils are properly insulated to prevent short circuits.
• Use a high-quality variometer for precise tuning.

Steps to Assemble an Intermediate and Long Wave Regenerative Receiving Set:

1. Gather the following components:
- Loading coils
- Variocoupler inductance coils
2. Connect the loading coils in series with the tuning circuit.
3. Attach the variocoupler inductance coils to the loading coil circuit.
4. Ensure all connections are secure and insulated.
5. Test the set by adjusting the loading coils and variocouplers for optimal reception.

Notes:
• Use high-quality components for better intermediate and long wave reception.
• Adjust the loading coils and variocouplers to tune into desired frequencies.

Procedure for Configuring a Magnetic Modulator in a Wireless System:

1. Use laminated iron core: Construct the magnetic modulator with an iron core made of thin plates, known as _laminations_, to allow high-frequency oscillations to pass through.
2. Connect microphone current: Ensure that the direct current from the microphone flows through a coil wound on the laminated iron core.
3. Modulate oscillating currents: The microphone current varies the magnetic permeability of the soft iron core by causing magnetic saturation, which modulates the large oscillating currents in the transformer's coil.
4. Connect to aerial wire system: Connect the magnetic modulator into the aerial wire system as shown in Figure 88 and Figure 93.

Notes: The magnetic modulator operates independently of the microphone current, allowing a small direct current to modulate large oscillating currents efficiently.

Procedure for Configuring a Microphone Modulator Using an Induction Coil:

1. Connect the induction coil: Ensure that the induction coil is connected in series with the microphone and battery.
2. Step-up voltage: The induction coil transforms the 6-volt direct current from the battery into 100 volts of alternating current.
3. Impress on oscillations: Connect the output of the induction coil to either:
- (a) The grid circuit, as shown in Figure 89 and Figure 90.
- (b) The aerial wire system, as depicted in Figure 89 and Figure 93.
4. Modulate oscillations: As current flows through the primary coil of the induction coil, it magnetizes the soft iron core. Variations in microphone current alter the strength of this magnetic field, which in turn varies the alternating voltage produced in the secondary coil. This modulated voltage is then impressed on and modulates the oscillating currents.

Notes: The induction coil functions as a miniature transformer. It is used to efficiently step-up the voltage for modulation purposes.

Procedure for Configuring a Microphone Transformer in a Wireless Telephone System:

1. Select the transformer: Use a microphone transformer specifically designed for wireless telephone modulation.
2. Open magnetic circuit core: Ensure that the iron core of the transformer is of the open magnetic circuit type, as shown in Figure 87.
3. Turns ratio optimization: Set the turns ratio between the primary and secondary coils such that when the secondary current is impressed on either:
- (a) The grid circuit, or
- (b) The aerial wire system,
it controls the oscillations with maximum efficiency.
4. Connect to modulation circuits: Connect the transformer in a position where its output can effectively influence the oscillating currents in the grid circuit or aerial wire system.

Notes: This type of transformer is optimized for wireless telephone applications, ensuring that modulated signals are transmitted efficiently.

Materials Required:

• Thin brass plates
• Insulating compound (special)
• Paper or tinfoil sheets

Steps to Construct the Condenser:

1. Prepare Materials:
- Gather thin brass plates and alternate them with paper or tinfoil sheets.
- Ensure that the layers are evenly spaced and insulated with a special compound to prevent short circuits.

2. Assemble the Condenser:
- Stack the brass plates and insulating materials together in a compact form, pressing them firmly into place.
- The condenser is formed by building up alternate sheets of paper and tinfoil in the same fashion as receiving condensers described in Chapter III.

3. Mount the Condenser:
- Place the assembled condenser in the bottom of the box or on the base where it will be used.
- Ensure that it is properly insulated from other components to avoid electrical interference.

4. Connect the Condenser:
- One end of the condenser connects to the spring of the vibrator, and the other end connects to the adjusting screw standard in the spark coil circuit.

5. Final Checks:
- Ensure that all connections are secure and insulated where necessary.
- Verify that the condenser can withstand high potentials (electric pressures) without damage or failure.
- Test the set by sending a signal through the telegraph key to ensure it operates as expected.

Procedure:

1. Gather materials: enameled copper wire, form (such as cardboard or plastic), and insulation tape.
2. Wind the copper wire tightly around the form in a honeycomb pattern to create multiple layers of coil windings.
3. Ensure that each turn is spaced evenly and overlaps slightly with the previous one for uniformity.
4. Secure the ends of the wire with insulation tape or solder them together if needed.
5. Cover the entire coil with insulation tape to protect it from moisture and physical damage.
6. Test the coil by connecting it to a signal source and measuring its inductance using an appropriate meter.

Notes:
• Use a consistent winding pattern for better performance.
• Ensure that the wire is not damaged during the winding process.

Procedure:

1. Gather materials: inductance coils, variable condensers, and insulated wire.
2. Wind two or more inductance coils on separate forms to create the vario coupler.
3. Connect the coils using a variometer for adjustable coupling between them as shown in Fig. 53 and Fig. 54.
4. Incorporate variable condensers into the circuit to allow tuning across different frequencies.
5. Mount the components on an insulated base or chassis for stability.
6. Test the vario coupler by connecting it to a receiving set and adjusting the coupling and tuning controls until a clear signal is received.

Notes:
• Ensure that all connections are secure to prevent signal loss.
• Use high-quality variable condensers for precise tuning.

Procedure for Operating a Rectifier Vacuum Tube:

1. Use two-electrode vacuum tube: A rectifier vacuum tube is a simple two-electrode device that converts alternating current into pulsating direct current.
2. Rectify process: The method of rectification is similar to how a two-electrode vacuum tube detector changes oscillating currents into pulsating direct currents, as explained in Chapter XII.
3. Apply to wireless telephony: In systems requiring continuous direct current for modulation (e.g., wireless telephone), the alternating current must first be rectified using these tubes.
4. Use in oscillator circuits: In some systems, such as C.W. Telegraph Transmitting Sets described in Chapter XVII, the oscillator tubes may also function as rectifiers.

Notes: Rectifier vacuum tubes are essential for converting alternating current into a form suitable for use in wireless telephony and other radio applications.

Procedure for Rectifying Alternating Current in a Wireless Telephone System:

1. Use rectifier vacuum tubes: Connect a pair of rectifier vacuum tubes to convert alternating current into pulsating direct current, as shown in Figure 93.
2. Alternate plate charging: Ensure that the plates are positively charged alternately with every reversal of the current, maintaining continuous oscillations without breaks in continuity.
3. Sustain oscillations: Use two oscillator tubes to sustain the oscillations required for signal transmission.
4. Ensure stable output: The rectified current must be smoothed out before passing into the oscillator tube to ensure a continuous and stable direct current is available for modulation.

Notes: This process ensures that the alternating current is efficiently converted into a form suitable for wireless telephony, without interruptions in signal transmission.

Objective: Understand how electrons function within vacuum tubes for detection and amplification.

Procedure:
1. Recognize that matter is composed of molecules, atoms, and subatomic particles: a central core of positive particles (protons) surrounded by negative particles (electrons).
2. Note that the number of protons in an atom determines its elemental identity:
- Hydrogen has 1 proton.
- Uranium has 92 protons.
3. Understand that atoms are neutral when they have equal numbers of positive and negative charges.
4. Learn that ionization occurs when electrons are separated from atoms, resulting in:
- A positive ion: an atom that has lost one or more electrons.
- A negative ion: an atom that has gained additional electrons.
5. Recognize that electron flow between two oppositely charged elements forms a current of negative electricity (as shown in Fig. 70).
6. Understand the conventional and actual direction of electric current:
- Conventional: from positive to negative pole.
- Actual: Electrons flow from negative to positive pole, while ionized atoms move in the opposite direction.

Procedure:

1. Understand the power output differences:
- FRS radios operate at a maximum of 500 milliwatts (0.5 watts) with integral antennas.
- GMRS radios operate between 1 to 5 watts and may have detachable antennas.
2. Know the typical range for each type:
- Under ideal conditions, FRS radios can transmit up to about 2 miles.
- GMRS radios can transmit up to 10 miles under ideal conditions but typically reach a maximum of 5 miles.
3. Consider environmental factors that affect range:
- Terrain, weather, and obstructions (e.g., trees or buildings) may reduce the effective range of both FRS and GMRS radios.
4. Use GMRS for longer distances:
- If you need to communicate over greater distances or in areas with poor signal conditions, choose a GMRS radio with a license.

Procedure for Using Reactors and Condensers in Radio Systems:

1. Install reactor: Use a single coil of wire wound on an iron core (called a _reactor_) with high inductance, as shown in Figure 90 and A in Figure 91.
2. Smooth current flow: When alternating current flows through the reactor, it creates a counter electromotive force that opposes the current, reducing its frequency dependence.
3. Use filter reactor: In systems using modulators (e.g., wireless telephone transmitters), use a filter reactor as shown in Figure 92 to smooth out pulsating direct currents after rectification.
4. Add condensers for filtering: Use _filter condensers_ alongside the reactor to further smooth the current, as they react differently to frequency than reactors (lower frequencies cause greater reactance).

Notes: Reactors and condensers work together to filter out unwanted fluctuations in pulsating direct currents after rectification.

Procedure for Using a Vacuum Tube as a Modulator:

1. Connect second tube: Use a second vacuum tube as the modulator, as shown in Figure 90.
2. Choose modulation method: Select one of two methods:
- (a) _Absorption_ of energy from the oscillator tube's current (not recommended due to inefficiency).
- (b) _Varying_ the direct current that energizes the plate of the oscillator tube (preferred and efficient method).
3. Modulate via grid voltage: Vary the voltage on the modulator tube’s grid using the secondary coil from an induction coil or microphone transformer.
4. Amplify variations: The modulator tube acts as a variable resistance, amplifying the variations impressed on the oscillations set up by the oscillator tube.

Notes: A vacuum tube used as a modulator is not necessary when a magnetic modulator is already in use, as both perform similar functions.

Materials Required:

• Soft iron core
• Primary coil (heavy insulated wire)
• Secondary coil (fine insulated copper wire)
• Vibrator (interrupter)
• Condenser

Steps to Wire the Spark Coil:

1. Assemble Core and Coils:
- Wind a couple of layers of heavy insulated wire around the soft iron core to form the primary coil.
- Over this, but insulated from it, wind a large number of turns of very fine insulated copper wire to form the secondary coil.

2. Mount Components:
- The core, primary, and secondary coils are set in a box or mounted on top of a hollow wooden base.
- Place the condenser in the bottom of the box or on the base.
- Mount the vibrator (interrupter) on one end of the box or on top of the base. This is the only part that needs adjusting.

3. Wire the Spark Coil:
- Connect one battery binding post to one end of the primary coil.
- Connect the other end of the primary coil (wound on the soft iron core) to the spring of the vibrator.
- Connect the other battery binding post to a standard that supports an adjusting screw with a platinum point.
- Shunt the condenser across the vibrator: one end of the condenser connects to the spring, and the other end connects to the adjusting screw standard.

4. Connect Secondary Coil:
- The ends of the secondary coil lead to two binding posts, which are usually placed on top of the spark coil.
- Connect these binding posts to the spark gap for signal transmission.

5. Final Checks:
- Ensure all connections are secure and insulated where necessary.
- Verify that the vibrator is properly mounted and can be adjusted as needed.
- Test the set by sending a signal through the telegraph key to ensure it operates as expected.

Overview: This procedure outlines how to construct choke coils used in the high voltage secondary circuit of an alternating current (AC) telegraph transmitting set.

Materials Required:
• No. 28, Brown and Sharpe gauge, cotton-covered magnet wire.
• A spool with a diameter of 2 inches and length of 2.5 inches.

Construction Steps:
1. Wind approximately 100 turns of the specified magnet wire around the spool.
2. Ensure that the winding is tight and evenly spaced to maintain consistent inductance.
3. After completion, the choke coil will have an inductance of about 0.5 millihenry at 1,000 cycles (standard AC frequency for this application).

Notes:
• These coils are used to filter and regulate high voltage current in the secondary circuit.
• They should be made with care to ensure they can handle the expected electrical load without overheating.

To set up a heterodyne or beat long wave telegraph receiving set, follow these steps:

1. Select the appropriate components based on whether you are using an autodyne (self-heterodyne) or separate heterodyne setup.
- For an autodyne setup: Use one variocoupler with primary and secondary coils, two .001 mfd variable condensers, one .0005 mfd variable condenser, a .5 to 2 megohm grid leak resistance, a vacuum tube detector, A battery, rheostat, B battery, potentiometer, .001 mfd fixed condenser, and a pair of headphones.
- For a separate heterodyne setup: Use four compact inductance coils, three .001 mfd variable condensers, one .0005 mfd variable condenser, 1 megohm grid leak resistance, vacuum tube detector, A battery, two rheostats, two B batteries (one with taps), potentiometer, vacuum tube amplifier for oscillations, headphones, and parts for a two-step amplifier if needed.

2. Assemble the components according to the wiring diagrams provided in the text:
- For an autodyne setup: Refer to Fig. 60 for the wiring diagram of the long wave autodyne or self-heterodyne receptor.
- For a separate heterodyne setup: Use Fig. 61 for the wiring diagram of the long wave separate heterodyne receiving set.

3. Adjust the B battery using the potentiometer to ensure proper operation of the receiver.

4. Ensure the aerial is properly installed: A single wire 200 or more feet in length is recommended, and it should be as high above the ground as possible for optimal signal reception.

5. Test the setup by tuning into long wave stations using the variable condensers and adjusting the components to achieve clear reception of signals in International Morse code.

Overview: This procedure outlines how to assemble a long-distance continuous wave telegraph transmitting set using alternating current (AC) instead of direct current (DC). It is suitable for home installation and requires minimal cost and effort.

Required Components:
1. One hot-wire ammeter for the aerial, reading up to 5 amperes.
2. One tuning coil.
3. One aerial condenser.
4. One grid leak.
5. One telegraph key.
6. One grid condenser, with two terminals.
7. One 5 watt oscillator tube.
8. One 0.002 mfd. 3,000 volt by-pass condenser.
9. One pair of choke coils for the high voltage secondary circuit.
10. One milli-ammeter, reading from 0 to 250 milliamperes.
11. One AC power transformer, with an input of 325 volts and working on a 50–60 cycle current at 102.5–115 volts.
12. One rheostat.
13. One panel cut-out.

Choke Coils Construction:
• Each choke coil is made by winding about 100 turns of No. 28, Brown and Sharpe gauge, cotton-covered magnet wire on a spool that is 2 inches in diameter and 2.5 inches long.
• This results in an inductance of approximately 0.5 millihenry at 1,000 cycles.

AC Power Transformer Specifications:
• Input: 325 volts.
• Operates on a 50–60 cycle current at 102.5–115 volts (standard lighting current range).
• High voltage secondary coil output: 175 watts, develops potential of 350 to 1,100 volts.
• Low voltage secondary coil output: 175 watts, develops 7.5 volts.
• Transformer weight: Approximately 15 pounds.
• Cost: $25.00.

Wiring Connections:
• Refer to Fig. 82 for the wiring diagram.
• A storage battery is not required, as the secondary coil of the transformer supplies current to heat the filament of the oscillator tube.
• The filament voltmeter is connected across the filament secondary coil terminals.
• The plate milli-ammeter is connected to the mid-taps of both the plate and filament secondary coils.

Notes:
• This setup can be used for transmitting over distances up to 100 miles using a single 5 watt oscillator tube.

Overview: This procedure outlines how to install and configure an alternating current (AC) power transformer for use in a telegraph transmitter.

Transformer Specifications:
• Input: 325 volts for the 100 mile set, 750 volts for the 500–1,000 mile set.
• Operates on a 50 to 60 cycle current, compatible with standard lighting currents of 102.5 to 115 volts.

Installation Steps:
1. Ensure that the transformer is installed in a dry and well-ventilated area, away from moisture or heat sources.
2. Connect the primary coil to the AC power source using the appropriate voltage tap (adjustable via a rotary switch for 102.5–115 volts).
3. The high voltage secondary coil is used to energize the plate of the oscillator tube, and it develops a potential of 350 to 1,100 volts (for the 100 mile set) or 1,500 to 3,000 volts (for the 500–1,000 mile set).
4. The low voltage secondary coil is used to heat the filament and develops a potential of 7.5 volts (for the 100 mile set) or 10.5 volts (for the 500–1,000 mile set).

Notes:
• This transformer has no moving parts and is suitable for use with standard AC lighting current.
• Transformer weight: Approximately 15 pounds for the 100 mile set, larger for the 500–1,000 mile set.
• Cost: $25.00 for the 100 mile set, $40.00 for the 500–1,000 mile set.

Table of Enamel Wire

| No. of Gauge | Turns per Cubic Inch | Ohms per Linear Inch | Ohms per Square of Winding |
|--------------|----------------------|----------------------|----------------------------|
| 20 | 30 | 885 | .748 |
| 22 | 37 | 1400 | 1.88 |
| 24 | 46 | 2160 | 4.61 |
| 26 | 58 | 3460 | 11.80 |
| 28 | 73 | 5400 | 29.20 |
| 30 | 91 | 8260 | 70.90 |
| 32 | 116 | 21,000 | 7547.00 |
| 34 | 145 | 13,430 | 2968.00 |
| 36 | 178 | 31,820 | 1098.00 |
| 38 | 232 | 54,080 | 456.00 |
| 40 | 294 | 86,500 | 183.00 |

This table provides data on the number of turns per cubic inch, ohms per linear inch, and ohms per square of winding for different B.& S. gauges of enamel wire.

Table of Feet per Pound of Insulated Magnet Wire

| No. of B.& S. Gauge | Single 4-Mils Cotton | Double 8-Mils Cotton | Single 1-3/4-Mils Silk | Double 4-Mils Silk | Enamel |
|---------------------|----------------------|-----------------------|------------------------|--------------------|--------|
| 20 | 311 | 298 | 319 | 312 | 320 |
| 21 | 389 | 370 | 408 | 389 | 404 |
| ... | ... | ... | ... | ... | ... |

This table provides data on the number of feet per pound for different types and gauges of insulated magnet wire.

Table of Frequency and Wavelengths

| W.L. (Wave Length in Meters) | F (Number of Oscillations per Second) | O (Oscillation Constant) | L.C. (Inductance in Centimeters, Capacitance in Microfarads) |
|-----------------------------|--------------------------------------|----------------------------|--------------------------------------------------------------|
| 50 | 6,000,000 | .839 | .7039 |
| 100 | 3,000,000 | 1.68 | 2.82 |
| 150 | 2,000,000 | 2.52 | 6.35 |
| 200 | 1,500,000 | 3.36 | 11.29 |
| 250 | 1,200,000 | 4.19 | 17.55 |
| 300 | 1,000,000 | 5.05 | 25.30 |
| 350 | 857,100 | 5.87 | 34.46 |
| 400 | 750,000 | 6.71 | 45.03 |
| 450 | 666,700 | 7.55 | 57.00 |
| 500 | 600,000 | 8.39 | 70.39 |
| ... | ... | ... | ... |

This table provides data on wave lengths in meters, number of oscillations per second, and the relationship between inductance (in centimeters) and capacitance (in microfarads).

Table of Sparking Distances in Air for Various Voltages between Needle Points

| Volts | Distance (Inches) | Distance (Centimeters) |
|-------|-------------------|------------------------|
| 5,000 | .225 | .57 |
| 10,000| .470 | 1.19 |
| 15,000| .725 | 1.84 |
| 20,000| 1.000 | 2.54 |
| 25,000| 1.300 | 3.30 |
| 30,000| 1.625 | 4.10 |
| ... | ... | ... |

This table provides data on the sparking distances in air for various voltages between needle points.

Greek Alphabet Pronunciation

• a: alpha
• b: beta
• g: gamma
• d: delta
• e: epsilon
• z: zeta
• ae: eta
• th: theta
• i: iota
• k: kappa
• l: lambda
• m: mu
• n: nu
• x: Xi (Zi)
• o: omicron
• p: pi
• r: rho
• s: sigma
• t: tau
• u: upsilon
• ph: phi
• ch: chi
• ps: psi
• o: omega

International Morse Code and Conventional Signals

This section provides information on the international Morse code and conventional signals used in radio communication. It includes details on how to transmit and interpret Morse code messages, as well as standard signals used in amateur radio operations.

• Morse Code: A system of dots and dashes representing letters and numbers for transmission over radio waves.
• Conventional Signals: Standardized signals used by radio operators to communicate specific information (e.g., distress calls, identification codes, etc.).

Examples of Morse Code Symbols:
• A: .-
• B: -...
• C: -.-.
• D: -..
• E: .
• F: ..-.
• G: --.
• H: ....
• I: ..
• J: .---
• K: -.-
• L: .-..
• M: --
• N: -.
• O: ---
• P: .--.
• Q: --.-
• R: .-.
• S: ...
• T: -
• U: ..-
• V: ...-
• W: .--
• X: -..-
• Y: -.--
• Z: --..

Conventional Signals:
• SOS: ...---...
• AR: .-.
• SK: ...-
• K: -.-
• CQ: -.-..--.
• QRZ: .--. .-. ---
• QSY: .--. --.--

Quantity Symbol

• capacitance: C
• conductance: g
• coupling coefficient: k
• current, instantaneous: i
• current, effective value: I
• decrement [Greek: delta]:
• dielectric constant [Greek: alpha]:
• electric field intensity [Greek: epsilon]:
• electromotive force, instantaneous value: E
• electromotive force, effective value: F
• energy: W
• force: F
• frequency: f
• frequency x 2[Greek: pi] [Greek: omega]:
• impedance: Z
• inductance, self: L
• inductance, mutual: M
• magnetic field intensity: A
• magnetic flux [Greek: Phi]:
• magnetic induction: B
• period of a complete oscillation: T
• potential difference: V
• quantity of electricity: Q
• ratio of the circumference of a circle to its diameter =3.1416 [Greek: pi]:
• reactance: X
• resistance: R
• time: t
• velocity: v
• velocity of light: c
• wave length [Greek: lambda]:
• wave length in meters [Greek: lambda]m:
• work: W
• permeability [Greek: mu]:
• Square root [Math: square root]:

Objective: Adjust the detector to ensure it is sensitive and properly aligned with the crystal.

Steps:
1. Test the detector by using a buzzer, switch, and dry cell.
2. Connect one of the binding posts of the buzzer with one post of the switch.
3. Connect the other post of the switch to the zinc post of the dry cell.
4. Connect the carbon post of the dry cell to the other post of the buzzer.
5. Connect the post of the buzzer that is joined to the vibrator to the ground wire (as shown in Fig. 17).
6. Close the switch of the buzzer circuit and put on your head phones.
7. Move the wire point of the detector over various spots on the crystal until you hear sparks made by the buzzer in your phones.
8. Vary the pressure of the point on the crystal until you hear the sparks as loud as possible.
9. Open the switch and disconnect the buzzer wire from the ground wire of your set.

Notes:
• Be careful not to jar the detector after adjustment, as this may throw it out of alignment.
• A high-pitched buzzer (75 cents) is recommended for clarity.

Overview

To legally operate a wireless transmitting station, you must obtain a government license. There are three types of licenses available.

### Steps:
1. Determine your location: Identify which district you live in (e.g., Boston, New York City, Baltimore, etc.) to contact the appropriate *Radio Inspector*.
2. Understand license classes:
- *Restricted amateur license*: Required if within 5 nautical miles of a naval wireless station. Limits current to 0.5 kilowatts and wavelength to 200 meters.
- *General amateur license*: For those outside the 5-mile range, allows up to 1 kilowatt at 200 meters.
- *Special amateur license*: For special purposes (not just personal use), permits wavelengths up to 375 meters.
3. Apply for your license: Write to the *Radio Inspector* in your district with details about your setup and intended use.
4. No fees are required for any of the licenses.

Notes: A license is not needed for receiving sets, but you must keep any overheard messages confidential.

Overview

A wireless telegraph transmitter is used for sending messages using a telegraph key and spark gap.

### Steps:
1. Gather components: A *source of direct or alternating current*, a *telegraph key*, a *spark-coil* or *transformer*, a *spark gap*, an *adjustable condenser*, and an *oscillation transformer*.
2. Choose power source:
- Use *dry cells* or *storage battery* for low-power setups with a spark-coil (available in various sizes, from 1/4-inch to 6-inch sparks).
- For higher energy needs, use a *transformer* on an alternating current of 110 volts.
3. Use electrolytic interrupters if needed: If only direct current is available, use an *electrolytic interrupter* to make and break the current.
4. Set up the spark gap:
- Connect the spark-coil or transformer to the telegraph key and spark gap.
5. Adjust condensers: Use an *adjustable condenser* for tuning and a *fixed condenser* across telephone receivers if needed.
6. Connect to aerial system: Ensure your transmitter is connected to the aerial wire and ground as required.

Notes: Amateurs typically use *jump-spark* transmitters with a telegraph key, while *vacuum tube* transmitters are used for wireless telephone messages.

Objective: Adjust the receiving set to receive telegraphic signals or telephonic speech/music.

Steps:
1. First adjust the crystal detector with the buzzer as described in the procedure for _Set No. 1_.
2. Turn the knob of your variable condenser so that the movable plates are just half-way in.
3. Pull the secondary coil of your loose-coupled tuner halfway out.
4. Turn the switch lever on it until it makes contact with the middle contact point.
5. Set the slider of the primary coil halfway between the ends.
6. Listen for telegraphic signals or telephonic speech/music.
7. Slide the secondary coil in and out of the primary coil until the sounds are loudest.
8. Move the contact switch over the points forth and back until the sounds become even louder.
9. Move the slider to and fro until the sounds are yet louder.
10. Turn the knob of the condenser until the sounds are clear and crisp.

Notes:
• This process is referred to as _tuning in_ by wireless operators.
• Ensure all components are properly aligned for optimal signal reception.

Adjustment Steps:
1. Adjust the rheostat while listening to signals or other sounds to vary the current flowing from the A or storage battery through the filament so that it is heated to the right degree.
2. Carefully adjust the rheostat to find the point at which the tube becomes the most sensitive.
3. Use the rheostat to prevent the filament from burning out when the current first flows through it.
4. Recharge the A or storage battery if needed to increase the sensitivity of the vacuum tube after prolonged use.

Factors Affecting Sensitivity:
• Filament Brilliancy: The right amount of heat developed by the filament is crucial for optimal performance.
• Plate Voltage: Apply the correct voltage to the plate for maximum sensitivity.
• Vacuum Exhaustion: The degree to which the vacuum tube has been exhausted significantly affects its sensitivity. Over time, the vacuum may degrade, reducing sensitivity. In such cases, warming the tube over a candle flame can sometimes improve performance.

Note: Tubes filled with gas (rather than being fully evacuated) are less sensitive but more durable and cost-effective.

Objective: Assemble the wiring for Receiving Set No. 2.

Steps:
1. Use a loose coupled tuning coil and a variable condenser.
2. Mount the loose coupler at the back of a board on the left-hand side.
3. Mount the variable condenser on the right-hand side.
4. Mount the detector in front of the variable condenser.
5. Screw two binding posts, _a_ and _b_, in front of the tuning coil as shown in Fig. 16.
6. Connect the post of the sliding contact of the loose coupler with the wire that runs to the lightning switch and thence to the aerial.
7. Connect the post of the primary coil (outside coil) with the ground wire.
8. Connect the binding post leading to the switch of the secondary coil (inside coil) with one of the posts of the variable condenser.
9. Connect the post that is joined to one end of the secondary coil with the other post of the variable condenser.
10. Connect one of the posts of the condenser with one of the posts of the detector.
11. Connect the other post of the detector with the binding post _a_.
12. Connect the post _b_ to the other post of the variable condenser.
13. Connect a fixed condenser to the binding posts _a_ and _b_.
14. Connect the telephone receivers to these same posts (posts _a_ and _b_).

Notes:
• Use No. 16 or 18 insulated copper wire.
• Scrape the ends clean where they go into the binding posts.
• Ensure all connections are tight.
• Keep crossed wires separated by an inch or so, crossing them at right angles.
• Refer to wiring diagram B for visual confirmation.

Procedure for Assembling a Crystal Detector Set with Vacuum Tube Amplifier

1. Lay out components: Arrange the parts on a base or panel as follows:
- Place the loose coupled tuning coil on the left-hand side.
- Position the adjustable switch of the secondary coil on the right-hand end or in front, depending on its construction.
- Align the variable condenser, rheostat, crystal detector, and binding posts for the head phones in a line in front of each other.
- Place the vacuum tube amplifier behind the rheostat.
- Position the A and B batteries behind the parts or in any convenient location.
- Locate the fixed condensers and grid leak in positions that allow easy connection.

2. Connect components:
- Connect the sliding contact of the primary tuning coil to the leading-in wire and one end wire of the primary to the water pipe (as shown in Fig. 43).
- Connect the adjustable arm of the secondary tuning coil to a post of the variable condenser.
- Connect the other post of the variable condenser to a post of the fixed condenser, and then connect the other post of the fixed condenser to the grid of the amplifying tube.

3. Battery connections:
- Connect the first post of the variable condenser to the + (positive electrode) of the A battery.
- Connect the - (negative electrode) of the A battery to the rotating contact arm of the rheostat.
- Connect one end of the resistance coil of the rheostat to a post of the amplifier tube that leads to the filament.
- Connect the other filament post of the amplifier tube to the + (positive electrode) of the A battery.

4. Grid leak and B battery connections:
- Connect the negative (zinc pole) of the B battery to the positive electrode of the A battery.
- Connect the positive (carbon pole) of the B battery to one end of the grid leak.
- Connect the other end of the grid leak to the plate of the amplifier tube.

5. Crystal detector and head phones:
- Connect the metal point of the crystal detector to the end of the grid leak connected with the plate of the amplifier tube.
- Connect the crystal of the detector to one post of the head phones.
- Connect the other post of the head phones to the other end of the grid leak.

6. Fixed condenser placement:
- Connect a fixed condenser in parallel (across) the ends of the grid leak, as shown in Fig. 43.

Procedure for Assembling a Radio Frequency Transformer Amplifying Receiving Set

1. Use radio frequency transformer: Instead of using a grid leak resistance to couple the amplifier and detector tube circuits, use a _radio frequency transformer_ (a loose coupled tuning coil without an iron core), as shown in Fig. 45.

2. Position tubes: Place the amplifier tube in the first oscillation circuit and the detector tube in the second circuit.

3. Wiring diagram: Follow the wiring diagram at A in Fig. 45 for connecting the components.

4. Transformer details:
- The radio frequency transformer has no iron core, allowing high-frequency (radio frequency) oscillating currents to pass through it without being converted into low-frequency (audio frequency) pulsating currents until they flow through the detector.
- This setup is a one-step amplifier; however, multiple amplifying tubes can be connected using an equal number of radio frequency transformers for better results.

5. Multi-step amplifier: For a six-step amplifier (six amplifying tubes), typically use three radio frequency transformers and three audio frequency transformers in cascade.

Materials Required:
• Crystal detector
• Tuning coil
• Headphone
• Condenser
• Aerial wire system (flat top, inclined, inverted L, T)
• Spark gap lightning arrester or lightning switch
• Wiring and connectors

Steps to Assemble the Receiving Set:
1. Mount the Crystal Detector:
- Secure the crystal detector in a dry, non-metallic housing.
- Ensure it is protected from moisture and vibration.
2. Construct the Tuning Coil:
- Use a double slide tuning coil (as shown in Fig. 11) for adjustable frequency selection.
- Wind the coil with insulated copper wire on a form, ensuring proper spacing between turns.
3. Install the Headphone:
- Connect the headphone to the output of the circuit using appropriate wiring.
- Ensure the headphone is compatible with low-impedance signals.
4. Assemble the Condenser (Capacitor):
- Use a fixed condenser for stability or a variable rotary condenser for tuning purposes.
- Connect it in parallel with the tuning coil to form the resonant circuit.
5. Set Up the Aerial System:
- Choose an aerial type based on available space and materials (e.g., flat top, inverted L, T).
- Use a single wire or two-wire system as shown in Figs. 6-7.
- Include spreaders to prevent sagging and ensure proper signal reception.
6. Install Lightning Protection:
- Add a spark gap lightning arrester (Fig. 6B) or a lightning switch (Fig. 6C) to protect the set from electrical surges.
7. Connect the Components:
- Wire the crystal detector, tuning coil, condenser, and aerial together as shown in Fig. 15B (wiring diagram for Receiving Set No. 1).
- Ensure all connections are secure and insulated to prevent short circuits.
8. Test the Set:
- Adjust the tuning coil and variable condenser to receive signals.
- Use the headphone to listen for incoming transmissions.

Notes:
• The set should be placed in a location with minimal interference (e.g., away from power lines).
• Regular maintenance is required, especially checking connections and replacing worn components.

Materials Required:
1. A loose coupled tuning coil
2. A variable condenser
3. A vacuum tube detector
4. An A or storage battery (6 volts)
5. A B or dry cell battery (22-1/2 volts)
6. A rheostat for varying the storage battery current
7. A pair of 2,000-ohm head telephone receivers

Assembly Steps:
1. Place all components on a board or base.
2. Position the tuning coil on the left-hand side with the adjustable switch end toward the right.
3. Set the variable condenser in front of the tuning coil.
4. Place the vacuum tube detector at the right-hand end of the tuning coil.
5. Put the rheostat in front of the detector.
6. Position the batteries behind the instruments.
7. Screw binding posts a and b to the right-hand lower edge of the base for connecting the head phones.

Wiring Instructions:
1. Connect the sliding contact of the primary coil (fine wire) to the upper post of the lightning switch.
2. Connect one terminal of this coil with the water pipe.
3. Connect the free end of the secondary coil (heavy wire) to one of the binding posts of the variable condenser.
4. Connect the movable contact arm of the adjustable switch of the primary of the tuning coil with the other post of the variable condenser.
5. Connect the grid of the vacuum tube to one of the posts of the condenser.
6. Connect the plate of the vacuum tube to the carbon terminal of the B or dry cell battery (positive pole).
7. Connect the zinc terminal of the negative pole to binding post a.
8. Connect post b to the other side of the variable condenser.
9. Connect the terminals of the head phones to the binding posts a and b.
10. Ensure that the plate connections of the battery are not reversed.

11. Connect one of the posts of the rheostat to one terminal of the filament.
12. Connect the other terminal of the filament to the negative terminal of the A or storage battery.
13. Connect the positive terminal of the A or storage battery to the other post of the rheostat.
14. Finally, connect the positive terminal of the A or storage battery with the wire that runs from the head phones to the variable condenser.

To assemble a vacuum tube telegraph transmitter:

1. Components Required:
- A source of direct or alternating current.
- A telegraph key.
- A vacuum tube oscillator.
- A tuning coil.
- A condenser.
2. Function: This setup produces _sustained_ oscillations, unlike the periodic oscillations produced by a spark gap set.
3. Advantages: The advantages of this system will be explained in detail in Chapter XVI.

Procedure for Assembling an Audio Frequency Transformer Amplifying Receiving Set

1. Use audio frequency transformers: Use these to step up the voltage of the current from the detector and amplifier tubes.

2. Transformer function: The iron core in the audio frequency transformer chokes off radio frequency currents, ensuring that only audio frequency currents pass into the plate circuit of the detector.

3. Wiring diagram: Follow the wiring diagram at B in Fig. 46 for connecting the vacuum tube detector and two-step amplifier tubes with audio frequency transformers.

4. Transformer details:
- An audio frequency transformer is shown at A in Fig. 46 and costs $6 to $7.
- This setup forms a two-step audio frequency receiving set, where amplifying tubes are connected in cascade using the transformers.

To build a condenser suitable for use in spark telegraph transmitters:

1. Materials: Use ordinary Leyden jars, or glass plates coated with tin or copper foil and set into a frame.
2. Alternative Construction: Build up the condenser using mica and sheet metal embedded in an insulating composition.
3. Cost-Effective Option: Glass plate condensers are the cheapest option and will serve your purpose well, especially if they are immersed in oil for added insulation and durability.

Procedure for Connecting a Grid Leak Amplifying Receiving Set with Vacuum Tube Detector

1. Set up components: Build the set exactly like the crystal detector set described above, including the grid leak resistance.

2. Shunt vacuum tube detector: Connect a vacuum tube detector in parallel (across) the grid leak resistance, as shown at A in Fig. 44.

3. Battery configuration:
- For sets with one amplifier and one detector tube, use an A or storage battery of 6 volts for all components (as shown at B in Fig. 44).
- For each vacuum tube used, ensure a B or 22-1/2 volt dry battery is available to charge the plate.

4. Wiring diagram: Follow the wiring diagram at A in Fig. 44 for connecting the grid leak and vacuum tube detector with one-step amplifier.

Components Required:
• Vacuum tube detector
• A or storage battery (6 volts)
• B or dry cell battery (22-1/2 volts)
• Rheostat
• Variable condenser
• Head phones

Connection Steps:
1. Connect the grid of the vacuum tube to one of the posts of the variable condenser.
2. Connect the plate of the vacuum tube to the carbon terminal (positive pole) of the B or dry cell battery.
3. Connect the zinc terminal (negative pole) of the B or dry cell battery to binding post a.
4. Connect post b to the other side of the variable condenser.
5. Connect the terminals of the head phones to the binding posts a and b.
6. Ensure that the plate connections of the battery are not reversed.

7. Connect one of the posts of the rheostat to one terminal of the filament.
8. Connect the other terminal of the filament to the negative terminal of the A or storage battery.
9. Connect the positive terminal of the A or storage battery to the other post of the rheostat.
10. Finally, connect the positive terminal of the A or storage battery with the wire that runs from the head phones to the variable condenser.

Materials Required:
1. A loose coupled tuning coil
2. A variable condenser
3. Two fixed condensers
4. A crystal detector or better, a vacuum tube detector
5. An A battery (6 volt storage battery)
6. A rheostat
7. A B battery (22-1/2 volt dry cell battery)
8. A fixed resistance unit, also known as a leak grid
9. A pair of head-phones

Procedure:
1. Assemble the tuning circuit: Connect the loose coupled tuning coil in series with the variable condenser and one of the fixed condensers to form the antenna circuit.
2. Connect the detector circuit: Attach the crystal detector or vacuum tube detector to the output side of the tuning circuit. If using a vacuum tube detector, ensure it is properly biased with the A battery.
3. Set up the power supply: Connect the 6-volt storage battery (A battery) to the grid leak resistor and the rheostat in series. This provides biasing for the detector and controls signal strength.
4. Connect the audio output: Link the output of the detector circuit to the head-phones through the second fixed condenser, which acts as a coupling capacitor to block DC current while allowing AC signals (audio frequencies) to pass.
5. Add shielding: If using multiple amplifier tubes or vacuum tube detectors, ensure they are properly shielded from each other to avoid feedback and howling noise in the head-phones.
6. Test the circuit: Adjust the rheostat to control sensitivity and tune the variable condenser to receive signals. Listen through the head-phones for incoming radio transmissions.

Notes:
• The grid leak resistor must be carefully selected based on testing, as it determines the operating point of the detector tube.
• If using a vacuum tube detector instead of a crystal detector, additional biasing and amplification stages may be required.
• Ensure all components are properly insulated to avoid short circuits or interference.

Procedure for Constructing a Six Step Amplifier Receiving Set with Loop Aerial

1. Use three-step radio and audio frequency amplifiers: Use three amplifying tubes coupled with radio frequency transformers and three amplifying tubes coupled with audio frequency transformers, as described in the section on _A Radio Frequency Transformer Receiving Set_.

2. Construct loop aerial:
- Wind 10 turns of No. 14 or 16 copper wire about a wooden frame that is two feet on each side, spacing the wires 1/16 inch apart (as shown in Fig. 47).
- This forms an efficient indoor loop aerial, eliminating the need for an outdoor aerial.

3. Receiving range: With this six-step amplifier set and loop aerial, you can receive wavelengths of 150 to 600 meters from high-power stations at considerable distances.

4. Wiring diagram: Follow the wiring diagram shown in Fig. 47 for connecting the components.

To construct a tuning coil, also known as a transmitting inductance:

1. Materials: Use copper wire.
2. Winding: Wind 25 or 30 turns of the copper wire on an insulating tube or frame.
3. Purpose: This simple design is suitable for basic applications and provides the necessary inductance for tuning purposes.

To construct a wireless key suitable for amateur radio use:

1. Design the Key: Build it like an ordinary telegraph key, but ensure that it is somewhat heavier if large currents are to be used.
2. Contact Points: Provide large silver contact points to handle high current loads effectively.
3. Spark Gap Types: Choose from three types of spark gaps:
- The _plain_ or _stationary type_: Suitable for small spark-coil sets.
- The _rotating type_: Prevents arcing and ensures a quicker, cleaner break with less dragging of the spark.
- The _quenched gap_ type: More efficient than both plain and rotating types, and is noiseless.

To construct an oscillation transformer suitable for radio transmitters:

1. Primary Coil: Wind a number of turns of copper wire on a fixed insulating support to form the primary coil.
2. Secondary Coil: Wind approximately twice as many turns of copper wire on another fixed insulating support to form the secondary coil.
3. Relative Positioning: Ensure that the coils are relatively movable, allowing for tuning and adjustment of the transformer's inductance.
4. Regulatory Requirement: An oscillation transformer is required by government regulations unless _inductively coupled_ is used instead.

Overview

To begin wireless communication, you need to understand the basic components of a wireless system and how to obtain necessary licenses.

### Steps:
1. Understand the types of wireless systems: There are two main types: *wireless telegraph* (using a telegraph key) and *wireless telephone* (using a microphone transmitter).
2. Identify the parts of a wireless system:
- The *aerial wire system* or *antenna*
- The *transmitter* or *sender*
- The *receiver* or *receptor*
3. Obtain necessary information: If you live near an electrical supply store, visit it for equipment and advice. Otherwise, contact makers of wireless apparatus for catalogues and price lists.
4. Know what you need before buying: Understand the components required to achieve your goals (e.g., receiving vs. transmitting).
5. Get a government license:
- Required for *sending* messages but not for *receiving*.
- To apply, contact the *Radio Inspector* in your district: Boston, New York City, Baltimore, Norfolk, New Orleans, San Francisco, Seattle, Detroit, or Chicago.
6. Start with a receiving set: This is the easiest way to begin. You can listen-in to broadcasts without needing a license.
7. Consider aerial wire systems:
- If you live in an apartment or city, string your aerial on the roof (with permission).
- If not feasible, use wires along the building or even connect to an iron/brass bed for basic reception.
8. Ground connection is essential:
- Connect your receiving set to a wire that leads to moist earth.
- Use existing pipes if available; otherwise, bury copper or zinc sheets in the ground.
9. Choose between crystal and vacuum tube detectors:
- *Crystal detector* is cheaper but less sensitive and requires frequent adjustment.
- *Vacuum tube detector* is more sensitive but requires two small batteries.
10. Set up a simple receiving set: Consists of (a) a detector, (b) a tuning coil, and (c) a telephone receiver connected to the aerial and ground.
11. Use amplifiers for distant stations: Vacuum tubes can be used in *cascade* to amplify signals many times over.
12. Select appropriate receivers:
- A single receiver or a pair with a head-band gives better results.
- Higher resistance (e.g., 3,200 ohms) improves sensitivity.
13. Use a loudspeaker for group listening: A metal cone fitted with a telephone receiver can project sound to a room full of people.

Overview

A simple receiving set consists of three main components: a detector, a tuning coil, and a telephone receiver.

### Steps:
1. Select the detector: Choose between *crystal* or *vacuum tube* detectors. Crystal is cheaper but less sensitive; vacuum tube requires batteries but is more reliable.
2. Set up the tuning coil:
- A simple tuning coil consists of a single layer of copper wire wound on a cylinder with an adjustable contact.
- For sharp tuning, use a *loose coupled tuning coil* and connect a variable condenser across the closed oscillation circuit.
3. Connect to aerial and ground: Ensure your receiving set is connected to both the aerial wire and a good ground connection (e.g., through pipes or buried copper/zinc sheets).
4. Use fixed condensers:
- Connect a *fixed condenser* across the telephone receivers when using a single coil tuner.
5. Add amplification if needed: Use vacuum tubes in *cascade* to amplify signals for distant stations.
6. Select appropriate receivers:
- A single receiver or a pair with a head-band gives better results.
- Higher resistance (e.g., 3,200 ohms) improves sensitivity.
7. Use a loudspeaker: For group listening, use a metal cone fitted with a telephone receiver to project sound.

Notes: The setup is ideal for beginners and can be assembled from separate components or purchased as a pre-assembled set.

Procedure for Preventing Howling in Radio Frequency or Audio Frequency Amplifiers

1. Shield amplifier tubes: Enclose each amplifier tube in a metal box and place them at least six inches apart from one another to prevent feedback.

2. Position transformers: Arrange the transformers so that their cores are at right angles to each other, and ensure they are placed no less than six inches apart.

3. Feedback prevention:
- Feedback through amplifiers can cause head phones or loudspeakers to howl.
- Proper shielding and spacing of components is essential for eliminating this issue in cascade amplifier systems.

Objective: Tune the receiving set using the tuning coil to receive signals.

Steps:
1. Move slide A of the double-slide tuner (see B in Fig. 15) over to the end of the coil connected with the ground wire.
2. Move slide B near the opposite end of the coil (the one that has the free end).
3. Move slide A toward slide B until you hear dots and dashes, speech, or music coming in as loud as possible.
4. Continue moving slide B toward slide A until the sounds become even louder.

Notes:
• With a few trials, you will be able to tune in or out any station within range.
• This method works best for stations that are not too close or powerful.

To understand the differences between spark gap and vacuum tube transmitters:

1. Spark Gap Set: Produces _periodic_ oscillations, which are discontinuous.
2. Limitation for Telephony: Cannot be used for wireless telephony due to the discontinuity of the oscillations.
3. Vacuum Tube Transmitter: Produces _sustained_ oscillations, which are continuous and ideal for wireless telephony.
4. Advantage of Vacuum Tubes: Easier to maintain sustained oscillations compared to electric arcs, making vacuum tubes nearly universal in wireless telephone transmitters.

Two-Electrode Vacuum Tube:
• Consists of a wire filament and a metal plate, sealed in a glass bulb with a vacuum or nitrogen gas.
• The wire filament is heated red-hot, while the metal plate remains cold and charged with positive electricity.
• Used as a detector but lacks amplification capabilities.

Three-Electrode Vacuum Tube (Triode):
• Includes an additional grid electrode, placed between the filament and the metal plate.
• Allows for greater control over current flow, enabling amplification of signals.
• More sensitive than two-electrode tubes and has largely replaced them in modern applications.

Connection Differences:
• In a three-electrode tube, the grid is connected to one post of the variable condenser.
• The plate is connected to the positive terminal of the B battery (dry cell), while the filament is connected to the A battery (storage battery) through the rheostat.

Advantages of Triodes:
• Greater sensitivity and amplification power.
• Can drive a loud speaker, making it suitable for public address systems or larger listening areas.

Procedure:

1. Select either a fixed, rotary, or quenched spark gap.

2. Fixed spark gaps are rarely used with large currents due to arcing issues.

3. Rotary spark gaps consist of:
- A wheel driven by an electric motor
- Projecting plugs (electrodes) on the wheel
- Stationary plugs on each side of the wheel

4. The number of sparks per second can be adjusted by changing the speed of the wheel.

5. Quenched spark gaps are preferred for induction coil sets:
- Eliminates noise from ordinary gaps
- Increases range by 200% when properly designed

6. Cost examples:
- Rotary gap with 110-volt motor: $25.00
- 1/4 kilowatt quenched gap: $10.00

Procedure:

1. Layout and placement:
- Screw the key to the table near the front edge.
- Place the high tension condenser behind the key.
- Position the oscillation transformer behind the condenser.
- Set the alternating current transformer to the left of the oscillation transformer.
- Place the rotary or quenched spark gap in front of the transformer.

2. Wiring steps:
- Bring No. 12 or 14 insulated wires from the 110-volt lighting leads.
- Connect them with a single-throw, double-pole switch.
- Connect one pole of the switch to the primary coil post of the alternating power transformer.
- Connect the other post of the transformer to one post of the key and the other post of the key to the other pole of the switch.

3. Motor connection:
- Connect the motor of the rotary spark gap to the power circuit.
- Use a single-pole, single-throw switch in the motor circuit.

4. Spark gap and condenser connections:
- Connect secondary coil posts to the rotary or quenched spark gap.
- Connect one post of the spark gap to one post of the condenser.
- Connect the other post of the condenser to the primary coil of the oscillation transformer (inside coil).

5. Ground and aerial connection:
- Connect the secondary coil post of the oscillation transformer to ground.
- Connect the clip of the secondary coil to the wire leading to the aerial when tuning.

Procedure:

1. For direct current use (110 volts), an electrolytic interrupter is required.

2. Construction of the electrolytic interrupter:
- A jar filled with a solution of 1 part sulfuric acid and 9 parts water.
- A lead electrode with a large surface area, fastened to the cover and set in a porcelain sleeve.
- The end of the electrode rests on the bottom of the jar.

3. Connection steps:
- Connect the interrupter in series with the primary coil of a spark coil or alternating current transformer.
- Apply direct current from 40 to 110 volts through it.
- The interrupter will make and break the circuit between 1,000 to 10,000 times per minute.

4. Adjusting interruptions:
- Raise or lower the porcelain sleeve to expose more or less of the platinum or alloy point, varying the number of interruptions per minute.

5. Polarity connection:
- Connect the platinum or alloy anode to the + (positive) power lead.
- Connect the lead cathode to the - (negative) power lead.

6. Cost: As low as $3.00.

Procedure:

1. Connect the aerial wire to the middle post of the lightning switch.

2. One end post of the lightning switch connects to one of the middle posts of the aerial switch.

3. The other end post of the lightning switch leads to a separate ground outside the building, ensuring proper grounding and protection from electrical surges.

4. This setup is shown in wiring diagrams (Figs. 26 and 27) for complete sending and receiving sets.

Procedure:

1. Use a double-pole, double-throw switch (or a specialized aerial switch) to install both a transmitter and receiver.

2. Mount the switch on a porcelain base for durability.

3. Connect one of the middle posts of the switch to the ground wire.

4. Connect the other middle post to the lightning switch, which connects with the aerial.

5. Connect the post of the tuning coil to one end post of the switch and the clip of the tuning coil to the complementary post.

6. Connect one opposite end post of the switch to the post of the receiving tuning coil, and connect the sliding contact of the latter to the other complementary post of the switch.

7. This setup allows switching between sending and receiving modes seamlessly.

Procedure:

1. For amateur use, only condensers with a capacitance of 0.007 microfarad are allowed.

2. A sectional high tension condenser can be used if it has the correct capacitance.

3. Cost examples based on transformer power:
- 1/4-kilowatt transformer: $7.00
- 1/2-kilowatt transformer: $14.00
- 1-kilowatt transformer: $21.00

Procedure:

1. Choose a standard wireless key as shown in the text.

2. The key should be heavier than a regular telegraph key with larger contact points.

3. Current is carried by heavy conductors directly to the contact points, not through bearings.

4. Available sizes and specifications:
- Size 1: Carries 5 amperes, costs $4.00
- Size 2: Carries 10 amperes, costs $6.50
- Size 3: Carries 20 amperes, costs $7.50

Procedure:

1. Purpose: To adjust the transmitter so that it sends out waves of a specific length (e.g., 200 meters).

2. Use a hot wire ammeter (also called a radiation ammeter) to tune the transmitter.

3. The hot wire ammeter consists of:
- A thin platinum wire through which high-frequency currents pass, heating it.
- Expansion and contraction of the wire moves a needle over a scale marked in fractions of an ampere.

4. Tuning steps:
- Adjust the spark gap and tuning coil until the ammeter shows the maximum energy flow (needle swings farthest to the right).
- This indicates that the aerial system and closed oscillation circuit are in tune, radiating the greatest amount of energy.

5. If using a condenser with 0.007 microfarad capacitance, tuning for 200-meter waves is achieved when the ammeter shows maximum energy flow.

Procedure:

1. To tune the transmitter to different wavelengths (other than 200 meters), you must have a wave-meter.

2. The wave-meter is used in conjunction with the hot wire ammeter and other tuning components.

3. It allows for precise adjustment of the transmitter's frequency output, enabling communication over various distances.

4. The wave-meter should be connected to the oscillation circuit or tuning coil as needed.

To gain a thorough understanding of electrical terminology and definitions:

1. Reference Material: Turn to the Appendix beginning on page 301 of this book.
2. Abbreviations Table: Find abbreviations of electrical terms commonly used in all works dealing with the subject.
3. Definitions Section: Review brief definitions of electric and magnetic units, which are essential for understanding technical discussions.
4. Memorization Recommendation: Commit these terms to memory or at least become thoroughly familiar with them so that you can instantly recognize their meanings when encountered.

### Maintaining Radio Receivers and Transmitters in Cold Weather

• Stress the vital importance of communications during northern operations.
• Place radio sets in sheltered locations whenever possible. Erect lean-tos, snowcaves, windbreaks, or any other appropriate type of shelter to protect equipment from direct exposure to extreme climatic conditions.
• Install a complete antenna system such as long wire antenna, elevated ground plane antenna, single wire inverted L-antenna, doublet antenna, which are more efficient than fractional wavelength whip antennas.
• Cut doublet antennas to operating frequency. The length of this antenna is determined by the following formula: _L_ = 468 / _F_, where _L_ is length in feet and _F_ is operating frequency in megacycles (468 is a constant factor derived from the basic formula). This formula does not apply to antennas longer than half-wave.
• Keep in mind that the radiation pattern of a doublet antenna is maximum at right angles to the plane of the antenna.
• Elevate radio frequency cables above the surface to ensure they will not freeze to the ground.
• Construct a counterpoise system in locations where frozen ground prevents installation of a ground rod or where a good earth ground is not available.
• Use radio retransmission stations to extend communications beyond the distance normally covered by one radio set.
• Use arctic lubricants on Radar and Beam antennas.
• Warm up radio sets for at least one-half hour before applying plate voltage to transmitter tubes. The sets may be turned on but do not transmit for at least one-half hour.
• Frequently check antenna system on mobile units and remove snow, ice, or slush formations.

Procedure:

1. Ensure all stations have a breakdown procedure in place based on their network and location.
2. If repair facilities are available nearby, operators should be aware of them and have access to the technical manual for technicians.
3. In areas without repair facilities, operators must await instructions from HQ.
4. HQ operators should monitor stations that do not respond when called and report this to the network maintenance person.
5. If a station remains off the air longer than normal, assume it has broken down and investigate further.
6. Even if a station cannot transmit, it may still be able to receive messages; continue calling them in and sending instructions.
7. Use alternative communication methods (e.g., couriers, other radio networks) to send critical instructions if a complete breakdown is suspected.

Purpose: Ensure continuous operation of a radio network by addressing potential failures and implementing maintenance procedures.

Procedure:
1. Preventive Measures:
- Choose, install, and operate equipment according to best practices (see para. 5.2.5 for details).
- Safeguard transceivers from external damage such as lightning by disconnecting aerials during storms.
- Ensure proper installation by a competent radio technician.

2. Maintenance Philosophy:
- Maintain spare parts, manuals, and circuit diagrams on-site to enable quick repairs.
- Avoid relying solely on sending faulty equipment to a central workshop for repair, especially in developing countries with limited transport options.
- Consider local training of nationals as radio technicians for long-term solutions.

3. Interim Solutions:
- Cooperate with other organizations to rotate a technician among them for 2 years at a time.
- Ensure compliance with visa and work permit regulations before sending expatriate personnel.

4. Financial Planning:
- Define financial arrangements early, including who will pay for:
- Repair of transceivers in the workshop (including parts and labor).
- Travel and accommodation costs for technicians visiting distant stations.
- Recurring replacements such as batteries.
- Consider payment methods that are practical in regions where bank cheques or transfers may be unreliable, including physical movement of money with appropriate safeguards.

5. Cost Estimation:
- Estimate costs at an early stage (see para. 5.1.6 for guidance).
- Be aware that the cost of providing a radio maintenance facility or using another’s can be significant and must not be underestimated.

Notes:
• In Zaire, it was common to find no spare parts, manuals, or circuit diagrams available when equipment failed, leading to prolonged downtime.
• A technician may charge $15 per hour for repairs, while a commercial firm might send a technician from Britain at the cost of travel, accommodation, and $300 per day.

Before attempting any Do It Yourself (DIY) repair on radio communications equipment, follow this procedure:

1. Preparation:
- Ensure that you have a clear understanding of the system and its components.
- Review all relevant documentation or manuals for the equipment being repaired.

2. Fault Finding Procedure:
- Perform the Fault Finding procedure as outlined in section 7.2.3 of this handbook before attempting any DIY repairs. This step is crucial to identify the exact nature and location of the fault.

3. DIY Considerations:
- Be aware that some jobs may turn into disasters if not performed correctly, especially in radio communications engineering where improper handling can lead to further damage or safety risks.
- Follow instructions carefully and ensure they are sufficiently well defined and adhered to.

4. Important Warnings:
- "A little knowledge is a dangerous thing" – be cautious when performing DIY repairs, as incorrect actions may cause more harm than good.
- Only proceed with DIY repairs if you have the necessary skills and tools.

Procedure:

• Verify that the power light or indicator is at its usual brightness; if dull, recharge or replace the battery.
• Ensure the power light remains bright during transmission. If it dims, the battery may not be sufficient for sending signals.
• Check that the TRANSMIT light flashes when speaking into the microphone. If it does not:
- Try using a spare microphone to determine if the issue is with the original one.
- If the TRANSMIT light still fails to function, there may be an internal fault in the transceiver.
• Repeat checks on all channels to identify whether the problem affects specific frequencies or all channels.
• Inspect aerials for damage, ensuring they are intact and not obstructed by branches or other objects. If damaged, attempt to restore them or request replacement parts from HQ.
• Examine aerial cables and connections for visible damage. Perform a temporary repair if possible and inform maintenance personnel immediately.

Procedure:

1. Identify fuse type:
- Most modern radio equipment uses non-repairable fuses (e.g., glass or ceramic tube encased fuse wire).

2. Handle blown fuses properly:
- If a fuse has blown, do not use a piece of wire to bypass it.
- The added wire should not exceed the fuse rating in current capacity.

3. Determine correct replacement fuse size:
- A current twice the "fuse rating" will blow the fuse.

4. Use Table 8.1 for reference:
- Use the following table to determine appropriate copper wire sizes and their corresponding fuse ratings:

|SWG|Diameter in mm.|Fuse rating in amps.|
|---|---|---|
|38|.152|3|
|35|.213|5|
|29|.345|10|
|25|.508|15|
|23|.610|20|
|21|.813|30|

5. Avoid improper fuse replacements:
- Using a wire with a fusing value in excess of the rated current can cause damage or safety hazards.

Procedure:

1. Check (1): For a battery-operated set, ensure that the battery leads are not disconnected and that the battery is still present.
- For a mains-operated transceiver, confirm there is power available in the radio room.
2. Check (2): Ensure that the fuse has not blown. Replace it with a good one if necessary.
- If the fuse blows again, there is likely a fault inside the transceiver. Do not replace the fuse again but inform HQ by some other means of the problem.
3. Check (3): Inspect plugs and cables for any visual damage.
- If a faulty cable is suspected, inform maintenance and request a replacement.
4. Check (4): Look for simple explanations such as:
- The power lead may be disconnected at both ends, with the next user only plugging into the wall socket without realizing the other end is not connected to the transceiver.

Notes:
• Always check the obvious and ordinary when troubleshooting a power failure.

Procedure for Initial Fault Diagnosis by the Operator:

1. Review and follow all operating instructions provided with the radio equipment.
2. Check that controls such as RF Gain or Squelch are set to their correct positions.
3. Verify that all connections (power, antenna, etc.) are secure and properly made.
4. Test basic functionality of the transceiver:
- Ensure that power is applied correctly.
- Check for any visible damage or loose components.
5. If no obvious issues are found, proceed to perform tests outlined in para. 8.6.2.1.

Notes:
• This step helps avoid unnecessary service calls and ensures that the operator is familiar with basic troubleshooting procedures.
• It also reduces downtime by identifying simple fixes before involving a technician.

Procedure:

• Remove power and aerial cables at the end of each contact session.
• Check battery acid level weekly, topping up with water as needed.
• Keep battery lugs free from corrosion, applying grease regularly to prevent damage.
• Maintain a clean environment for the radio: keep the cabinet, desk, or table free of dust and unnecessary paper.
• Ensure proper ventilation around the radio during use to avoid overheating.
• Remove dust sheets completely before using the radio after storage.
• Keep the radio room clean and secure, limiting access to authorized personnel only.
• Avoid excessive handling of controls, especially twisting knobs unnecessarily while waiting for contact.
• Prevent unauthorized use of the radio by restricting access to trained operators.
• Inspect aerials and cables regularly, particularly after storms or adverse weather conditions.
• Maintain solar panels by keeping them clean and ensuring they are not shaded by overgrowth.
• Assign a primary operator with a trained standby person in case of emergency.
• Keep operating instructions accessible for quick reference during troubleshooting.
• Report any breakdowns immediately to HQ, providing as much detail as possible about the issue.

Procedure:

1. Decide on your maintenance strategy before purchasing radio equipment.
2. Consider factors that influence annual maintenance costs, such as:
- Quality control during manufacturing
- Safeguards built into the equipment
- Good design of installation at each station
- Implementation of good operating procedures
3. If your network has 25 or more stations, consider having an in-house radio technician and workshop unless reliable repair facilities are available locally.
4. Evaluate the cost of setting up a workshop, including:
- Basic test equipment (starting at £1,000)
- Building, work benches, seating, lighting, fans, or air conditioning
5. Factor in annual costs for employing a technician.
6. Note that church missions and aid agencies may have cost advantages over commercial organizations when hiring technicians.
7. Once established, your repair facility can generate income by providing services to other groups.

Procedure:

1. Schedule regular inspections and maintenance by competent technicians to ensure the mean time between failures (MTBF) of your system is maximized.
2. Ensure proper installation of all components to prevent faults from occurring in the first place.
3. Have highly skilled technicians on call for immediate response during a disaster situation. These individuals should be well briefed, drilled, and equipped with the necessary tools for any repair or installation work.
4. Maintain a stock of spare parts that are specific to your equipment so that repairs can be made quickly without delays.
5. Establish long-term contracts with reliable maintenance companies. Keep them informed about the type of equipment you have and how it is maintained.
6. Do not rely solely on technology; always plan for human intervention, as no system is completely fail-safe.
7. Document all maintenance activities to track the condition of your equipment over time and identify patterns or recurring issues.

Procedure:

1. Determine spare parts needs:
- Hold a range of spare parts at the central maintenance facility rather than having a full set at each station.
- This reduces capital cost (e.g., 1 spare item for every 10 transceivers instead of 1 per transceiver).

2. Prioritize spare parts selection:
- Plug-in circuit boards or modules should be the highest priority.
- Mechanical parts liable to wear out, such as switches, press buttons, relays, and variable resistors (e.g., volume controls), are next in priority.
- Hot filament devices, like thermionic valves and indicator lights (not LEDs), follow.
- Plugs and sockets that are unplugged daily, such as aerial and power connections, should also be included.
- High power transistors used in the transmitter come next.
- Loudspeaker and microphone parts should be stocked.
- Non-standard components specific to a particular transceiver must be kept.
- A selection of transistors, resistors, and capacitors, chosen by the person responsible for maintenance, is also recommended.

3. Keep an up-to-date list:
- Maintain a detailed inventory of all spare parts held.
- Use identifying numbers where available to ensure correct part identification.

4. Consider keeping a spare transceiver:
- A completely spare transceiver can be kept at the central workshop for immediate replacement.
- It is best to wait until the faulty transceiver arrives at the workshop before dispatching the spare.
- The existence of a spare may cause issues in some cultures, especially if there is a long waiting list for radio equipment.
- Highlight that additional components (e.g., aerial, battery, solar charger, microphone) would be needed to make the spare transceiver functional as a complete station.

Procedure for Monitoring Battery Charge State:

1. Use a voltage indicator or hydrometer to measure the battery's state of charge daily before using the transceiver.
2. Record the readings in a logbook or digital tracking system.
3. Analyze the recorded data to detect trends that may indicate overuse, undercharging, or end-of-life issues.
4. Take corrective action if any of these conditions are detected:
- If overuse is suspected, reduce usage and ensure proper charging.
- If undercharging is identified, check the charger and power source.
- If battery life is nearing its end, replace it with a new one.

Notes:
• Regular monitoring prevents unexpected failures due to discharged batteries.
• This procedure helps in planning maintenance schedules and ensuring continuous operation of the radio equipment.

Procedure:

1. Inspect cables for signs of damage, such as broken or disconnected wires.
2. Gently move the cables, especially where they enter a plug or socket, to check if movement causes the transceiver to start working again.
3. If the transceiver works when the cable is moved or twisted, this indicates a potential fault in the wiring.
4. Report the issue by sending a message requesting a replacement cable or technician assistance.
5. Check battery acid levels regularly as instructed, since low voltage can cause problems with the radio and is often overlooked until it's too late.
6. Inspect wires connected to the battery for corrosion that may break the circuit.
7. Move these wires gently to see if they affect the transceiver’s operation, indicating a possible fault.

Procedure for Weekly Battery Maintenance:

1. Check the acid level in a vented battery each week.
- Use a hydrometer or visual inspection to determine if the acid level is low.
2. Refill with distilled or rain water as needed.
- Do not use tap water, as it contains minerals that can damage the battery.
3. Ensure proper sealing of the battery after refilling.
- Prevent spillage and exposure to air.

Notes:
• This procedure is essential for maintaining battery longevity and performance.
• If the battery is not vented, this step may not be necessary.

Procedure for Preventing Battery Terminal Corrosion:

1. Inspect battery terminals regularly for signs of corrosion.
- Look for white, green, or blue deposits on the terminals.
2. Clean corroded terminals using a wire brush or a solution of baking soda and water.
- Apply the solution with a cloth or brush to remove corrosion.
3. Apply petroleum grease (Vaseline) to the cleaned terminals.
- This creates a protective barrier against future corrosion.
4. Ensure that the battery connections are tight and secure.
- Loose connections can lead to increased corrosion over time.

Notes:
• Corrosion can cause poor electrical contact, leading to reduced performance or failure of the radio equipment.
• Regular cleaning and greasing will significantly extend the life of the battery terminals.

Procedure for Preventing Dust Accumulation on Radio Equipment:

1. Cover the transceiver and microphone with a dust cover when not in use.
- This prevents dust from settling on sensitive components.
2. Store the equipment inside a desk or cabinet when not being used.
3. Clean the exterior of the transceiver and microphone regularly using a soft, dry cloth.
4. Avoid using liquids or abrasive materials for cleaning.
- These can damage sensitive electronic components.

Notes:
• Dust accumulation can interfere with the performance of the radio equipment.
• Regular cleaning helps maintain optimal signal quality and longevity of the device.

Procedure:

1. Assess the need for tools:
- The decision on what tools to provide should be based on expectations of personnel involvement in radio equipment maintenance.

2. Restrict access if necessary:
- In some locations, it may be necessary to prevent unauthorized tampering with transceivers.
- Paint the instruction "Do not open" in white paint on the cover of the transceiver in three languages.
- Seal the screws securing the cover with white paint to prevent access.

3. Limit tool provision:
- In some cases, no tools may be supplied to certain locations if maintenance is not expected to be performed locally.
- This applies to all personnel, including expatriates and local staff.

Procedure for Maintaining Antenna Integrity in Tropical Areas:

1. Inspect the area around the antenna regularly for overgrowth of vegetation.
2. Cut down any branches that have grown over or are touching the aerial and its cable.
3. Remove creepers or vines that are growing up the aerial mast or cables.
4. Ensure that no part of the vegetation is in contact with the antenna or its supporting structures.

Notes:
• Vegetation can cause signal interference, damage to equipment, and even pose a safety hazard.
• Regular trimming helps maintain clear communication and prevents potential failures.

Procedure:

1. Check (1): Ensure that the generator or mains battery charger is providing the necessary charging current.
2. Allow sufficient time for recharging: If the battery does not recover, suspect it may be too old or damaged in some way.
3. Refer to para 3.2.3.3 on battery life and related topics for further guidance.

Notes:
• This procedure applies when the battery is charged by means other than solar panels.