The Icom service manual for the IC-H11 VHF and IC-U11 UHF transceivers provides detailed information on setup, operation, and troubleshooting, including specifications, circuit descriptions, adjustment procedures, and parts lists. It emphasizes safety precautions such as avoiding exposure to liquids and ensuring correct power supply connections to prevent damage to the transceivers.
Manual Overview
The Icom service manual for the IC-H11 VHF and IC-U11 UHF transceivers provides detailed technical guidance for servicing these units. It emphasizes the importance of troubleshooting flow, starting with confirming internal issues before disassembly. Technicians are advised to disconnect power before opening the transceiver and to handle variable components with care to avoid damage. The manual warns against applying excessive RF signals to prevent damage to the transceiver’s front end. Calibration and adjustments are to be performed using insulated tools, with specific procedures outlined for PLL, receiver, and transmitter adjustments for both models. Error codes and diagnostics are not explicitly detailed, but the manual stresses the importance of using attenuators when connecting test equipment to avoid signal overload. Board-level guidance includes layouts for logic, RF, and VCO units, with part ordering instructions requiring specific details like order numbers and component names. The manual also includes specifications for frequency range, channel spacing, and power requirements, ensuring technicians have a comprehensive understanding of the transceivers’ operational parameters.
Quick Issues Covered
- Diagnose IC-H11 power-up failures due to incorrect voltage supply.
- IC-U11 PLL circuit calibration and adjustment procedures.
- Schematics for IC-H11 circuit tracing and troubleshooting.
Overview
This service manual provides the latest service information for the IC-H11 VHF Transceiver and IC-U11 UHF Transceiver. It includes specifications, circuit descriptions, adjustment procedures, parts lists, mechanical parts and disassembly instructions, board layouts, block diagrams, and voltage diagrams. The manual also highlights safety precautions and repair notes for handling the transceivers.
Specifications
- Frequency range: See VERSIONS on the right page of inside cover.
- Mode: 16KOF3E, 14KOFSE, 8K50F3E
- Channel spacing: 25 kHz, 20 kHz, 12.5 kHz
- Number of channels: Up to 2 channels, Up to 6 channels
- Frequency stability: +0.0005% (—25°C to +55°C)
- Antenna impedance: 50 Ω unbalanced
- Acceptable battery pack: CM-80
- Current drain (with CM-80): Transmit 900 mA, Receive (max. audio) 250 mA, Receive (standby) 70 mA
- Usable temperature range: —25°C to +55°C
- Dimensions (with CM-80): 58 (W) x 149 (H) x 29 (D) mm
- Weight (with CM-80): 420 g
- Output power: 1.5 W (with CM-80)
- Modulation system: Variable reactance frequency modulation
- Microphone impedance: 1.2 kΩ
- Maximum deviation: +5 kHz, +4 kHz, +2.5 kHz
- Spurious emissions: <0.25 μW
- Harmonic emissions: <0.25 μW
- Noise and hum: >40 dB, >35 dB
- Audio response: +1 dB to —3 dB of +6 dB/octave with 300 Hz to 3000 Hz input
- Limiting of modulator: 70% to 100%
- Receive system: Double-conversion superheterodyne
- Sensitivity: 0.35 μV (PD) for 12 dB SINAD signal input modulated by 1 kHz tone at 60% peak deviation
- Squelch sensitivity (threshold): 0.35 μV
- Intermediate frequency: 1st 21.8 MHz, 2nd 455 kHz
- Adjacent channel selectivity: >70 dB, >60 dB
- Intermodulation rejection: >70 dB
- Spurious rejection: >70 dB
- Noise and hum: >40 dB
- Audio response: +1 dB to —3 dB of —6 dB/octave with 300 Hz to 3000 Hz modulation
- Audio output power (with CM-80): 300 mW with an 8 Ω load
- Audio output impedance: 8 Ω
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
“”
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 9 V. This will ruin the transceiver. DO NOT expose the transceiver to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when connecting the transceiver. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the transceiver’s front end. Make sure a problem is internal before disassembling the transceiver. DO NOT open the transceiver until it is disconnected from its power source. DO NOT force any of the variable components. Turn them slowly and smoothly. DO NOT short any circuits or electronic parts. An insulated tuning tool MUST be used for all adjustments. DO NOT keep power ON for a long time when the transceiver is defective. DO NOT transmit power into a signal generator or a sweep generator. ALWAYS connect a 40 dB to 50 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver.
Download MANUAL Service manual (PDF – 18.4 MB)
Icom IC-H11 Service Manual PDF (18.4 MB): Aids technicians in troubleshooting and calibrating the IC-H11 model.
- Brand: Icom-ic-h11-service
- Model: MANUAL
- Type: Service manual
- File size: 18.4 MB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download MANUAL service manual (PDF)
Icom-ic-h11-service MANUAL Overview
The Icom-ic-h11-service is a professional-grade communication device designed for reliable two-way radio communication. Widely used in various industries such as public safety, transportation, and event management, this model ensures clear audio transmission and robust performance in demanding environments. The service manual provides comprehensive guidance for maintenance, troubleshooting, and optimal operation of the device.
Main Features and Specifications
- Frequency Range: VHF/UHF bands for versatile communication
- Power Output: Adjustable transmission power for extended range
- Durable Construction: Rugged design suitable for harsh conditions
- Audio Quality: High clarity sound with noise reduction technology
- Battery Life: Long-lasting rechargeable battery for extended use
- Display: Clear LCD screen for easy channel and status monitoring
- Accessory Compatibility: Supports microphones, headsets, and external antennas
Basic Usage and Operation Tips
To operate the Icom-ic-h11-service effectively, ensure the device is fully charged before use. Select the appropriate frequency channel using the LCD interface and adjust the volume to a comfortable level. Use the push-to-talk (PTT) button to transmit messages and release it to listen. Regularly check the antenna connection for optimal signal strength. For extended communication sessions, consider using compatible headsets to maintain hands-free operation.
Troubleshooting and Maintenance
If you experience poor audio quality or intermittent signals, verify that the antenna is securely attached and free from damage. Restart the device to reset internal circuits if it becomes unresponsive. Regularly clean the exterior with a soft, dry cloth and avoid exposure to moisture. Replace the battery if you notice reduced operating time. Refer to the service manual for detailed diagnostic procedures and component replacement instructions.
Safety Reminder
Always operate the Icom-ic-h11-service in accordance with local regulations and guidelines. Avoid using the device near explosive materials or in environments with high electromagnetic interference. Do not attempt to disassemble the device unless qualified, as improper handling can cause injury or damage. Keep the device away from water and extreme temperatures to ensure safe and reliable operation.