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General| Frequency Range | 136-174 MHz |
|---|---|
| Channels | 128 |
| Waterproof | IP54 |
| Channel Capacity | 128 Channels |
| Channel Spacing | 12.5/25 kHz |
| Operating Temperature Range | –30°C to +60°C |
Overview of the service manual's scope and coverage for VHF mobile transceivers.
Essential safety precautions to prevent damage or injury when operating the transceiver.
Frequency coverage, channel capacity, impedance, and operating conditions.
Details on output power, modulation, deviation, and emission characteristics.
Information on receiver sensitivity, selectivity, and audio output performance.
Top and bottom views of the main unit, highlighting key ICs and components.
Top view of the Front-A unit PC board, identifying components and ICs.
Top view of the Front-B unit PC board, identifying components and ICs.
Step-by-step guide for disassembling the transceiver's front and main units.
Explanation of receiver stages: antenna switching, RF amplification, and mixer circuits.
Details on signal conversion in the 1st mixer and IF amplifier stages.
Explanation of the 2nd IF stage, mixer, and demodulator functionality.
Description of the AF amplifier circuit for driving the speaker.
Explanation of noise squelch and CTCSS/DTCS squelch operations.
Circuit diagram illustrating AF and microphone signal paths.
Overview of transmitter circuits, including microphone amplification and modulation.
Description of the YGR and power amplifier stages for RF output.
Explanation of the APC circuit for power amplifier protection and stabilization.
Description of the PLL circuit for stable frequency oscillation.
Explanation of the various voltage regulator circuits in the power supply.
Details on compander and digital mode circuits.
Explanation of the compander circuit for improved S/N ratio.
Description of digital signal processing for specific models.
Pin assignments and functions for the MAIN CPU (IC23).
Pin assignments and descriptions for the Front CPU (IC3).
Pin assignments for D/A converters IC8 and IC30 in the main unit.
Required test equipment and software installation for transceiver adjustments.
Crucial step: programming frequencies before starting software adjustments.
Example screen layout and explanation of adjustment parameters.
Diagram illustrating the necessary connections for software adjustments.
Information on the OPC-1122 jig cable and its wiring.
Procedure for adjusting LCD contrast via software and hardware check points.
Procedure for adjusting PLL lock voltage (RX/TX) using software.
Adjusting the reference frequency using a frequency counter.
Adjusting DSP frequency for specific models (IC-F1721D/F1821D).
Adjusting base band frequency for specific models (IC-F1721D/F1821D).
Adjusting output power levels (Hi, L2, L1) via software.
Adjusting modulation balance using a modulation analyzer.
Adjusting narrow FM deviation for specific channels.
Adjusting digital deviation for specific models (IC-F1721D/F1821D).
Adjusting deviation for CTCSS and DTCS signals.
Adjusting receiver sensitivity (BPF T1/T2) using SINAD meter.
Adjusting Digital RSSI level for specific models.
Adjusting the S-meter indication level.
Setting the squelch level to the point where audio signals just appear.
List of parts for the Front-A unit (IC-F1700 series) with order numbers.
List of parts for the Front-B unit (IC-F1800 series) with order numbers.
List of parts for the Main Unit, including ICs, transistors, and resistors.
List of parts for the Main Unit, including resistors and capacitors.
List of parts for the Main Unit, continuing resistors and capacitors.
List of parts for the Main Unit, continuing resistors and capacitors.
List of parts for the Main Unit, continuing capacitors.
List of parts for the Main Unit, continuing capacitors.
List of parts for the Main Unit, continuing capacitors.
List of parts for the Main Unit, including chassis parts.
List of chassis parts with order numbers and quantity.
Lists of mechanical parts for chassis, main, front units, and accessories.
List of mechanical parts associated with the chassis unit.
List of mechanical parts for the Main Unit.
List of mechanical parts for Front-A and Front-B units.
List of included accessories such as power cables and microphones.
Diagrams and symbols for transistors and FETs used in the transceiver.
Diagrams and symbols for diodes used in the transceiver circuits.
Top view of the Front-A unit PC board, showing component placement and labels.
Bottom view of the Front-A unit PC board, showing component placement and labels.
Top view of the Front-B unit PC board, showing component placement and labels.
Bottom view of the Front-B unit PC board, showing component placement and labels.
Top view of the Main Unit PC board, showing component placement and labels.
Bottom view of the Main Unit PC board, showing component placement and labels.
Contact details for Icom America Inc.
Contact details for Icom Canada.
Contact details for Icom (Australia) Pty. Ltd.
Contact details for Icom New Zealand.
Contact details for Beijing Icom Ltd.
Contact details for Icom (Europe) GmbH.
Contact details for Icom Spain S.L.
Contact details for Icom (UK) Ltd.
Contact details for Icom France S.a.
Contact details for Asia Icom Inc.
Contact details for Icom Polska.
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