The service manual for the Icom AT-120 HF Automatic Antenna Tuner provides detailed instructions on installation, setup, and operation, including unpacking, planning, and specific installation recommendations to ensure optimal performance with the IC-M700 series HF SSB transceivers. It also includes troubleshooting guidance, such as testing the tuner before permanent installation and ensuring proper coaxial cable connections to prevent operational issues.
Manual Overview
The Icom AT-120 HF Automatic Antenna Tuner service manual provides detailed guidance on troubleshooting, error diagnostics, calibration, and board-level maintenance for technicians. The manual covers two versions of the tuner: the AT-120 for general use and the AT-120E for use in France, both designed to work with the IC-M700 series HF SSB transceivers. Troubleshooting flow involves checking connections and ensuring proper installation, as outlined in the installation section. Error codes and diagnostics are not explicitly detailed, but technicians are advised to refer to the circuit descriptions and voltage diagrams for identifying issues. Calibration and adjustments are covered under the maintenance section, emphasizing the importance of proper antenna tuner adjustments for optimal performance. Board-level guidance includes detailed layouts and parts lists, enabling technicians to identify and replace faulty components effectively. The manual stresses the importance of proper installation, including avoiding long cable runs and ensuring the tuner is mounted close to an electrical ground to prevent operational issues.
Quick Issues Covered
- Diagnose power-up failures with voltage diagrams in Section 8.
- Calibrate antenna tuner using Section 7 adjustments.
- Trace circuits with schematics in Section 6 for troubleshooting.
Overview
The AT-120 HF Automatic Antenna Tuner, developed by ICOM Incorporated, utilizes advanced commercial and computer technology. It is primarily designed for use with the IC-M700 series HF SSB Transceivers. The service manual covers two versions of the tuner: the AT-120 (General version) and the AT-120E (France version), with the latter featuring a separated emergency tuner. The manual provides detailed information on specifications, installation, pre-operations, circuit descriptions, maintenance, voltage diagrams, board layouts, and parts lists for both versions.
Specifications
- Number of Semiconductors: Transistors 13
- ICs 19 (CPU included)
- Diodes 38 (#01), 43 (4402)
- Frequency Range: 2MHz~24MHz
- Power Capability: 150W PEP, 100W continuous
- Input Impedance: 50Ω
- Tune-up Power: 5~15W
- Tune-up Time: Typically 2 to 3 seconds
- Matching Accuracy (VSWR): Less than 2.0
- Antenna Required: Marconi-type with suitable RF ground (More than 23 feet suggested)
- Power Supply Required: 13.6V DC (negative ground), 2A maximum (supplied by the IC-M700)
- Usable Temperature Range: ~30°C~+60°C
- Dimensions: 230mm(W) x 340mm(D) x 80mm(H)
- Case Construction: Weatherproof
- Weight: 2.4kg (#01), 2.6kg (#02)
- Control Cable: AWG 14x 4 conductors
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The installation of the AT-120 HF Automatic Antenna Tuner involves several key steps. First, during unpacking, ensure that all parts and accessories are removed from the packing carton and check for any shipping damage. It is recommended to keep the shipping carton for future storage or transport.
When planning the installation, choose a location where the tuner will not be disturbed, and avoid long cable runs to the antenna and power source. Keep cables away from electrical pumps and other apparatus, and do not run them near magnetic compasses or electronic instruments. The antenna element should be more than 7 meters (23 feet) long for optimal performance, and certain lengths should be avoided as they may result in high SWR and longer tuning times.
For the tuner installation, attach the AT-120 either horizontally or vertically with a water drain screw facing downward to allow moisture to escape. Test the tuner to ensure it is operational before permanent mounting. Use the appropriate hardware for your installation type, which could be U-clamps, self-tapping screws, or hex head screws. For coaxial cable connection, prepare the cable and connectors, and use RG-8/U as the recommended coaxial cable.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 11.1 MB)
Icom AT-120 Service Manual: Provides technicians with detailed instructions for troubleshooting and calibrating the AT-120 model.
- Brand: Icom-at-120-service
- Model: MANUAL
- Type: Service manual
- File size: 11.1 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-at-120-service Overview
The Icom-at-120-service is a high-performance communication transceiver designed for reliable two-way radio communication in various professional and recreational settings. Known for its robust build and clear audio output, this device ensures seamless connectivity for users requiring dependable communication over short to medium distances.
Main Features and Specifications
- Frequency Range: VHF/UHF bands for versatile communication options
- Power Output: Up to 5 watts for clear signal transmission
- Channel Memory: Supports up to 128 programmable channels
- Battery Life: Long-lasting rechargeable battery with quick charge capability
- Display: Backlit LCD screen for easy readability in low light conditions
- Durability: Water-resistant and shockproof casing suitable for outdoor use
- Audio: Noise-cancelling microphone for enhanced voice clarity
Basic Usage and Operation Tips
To operate the Icom-at-120-service, first ensure the device is fully charged. Turn on the unit by pressing the power button and select the desired channel using the channel selector knob. Adjust the volume to a comfortable level before initiating communication. Press and hold the push-to-talk (PTT) button to transmit your message, and release it to listen. Regularly update the channel settings to match your communication group or network.
Troubleshooting and Maintenance
If you experience poor audio quality or weak signal strength, check the antenna connection and ensure it is securely attached. Replace the battery if the device fails to power on or shows reduced operating time. Clean the exterior and connectors with a dry cloth to prevent dust buildup. For persistent issues, refer to the detailed troubleshooting section in the service manual or contact authorized service centers.
Safety Reminder
Always operate the Icom-at-120-service in accordance with local regulations and guidelines. Avoid using the device near explosive materials or in environments with high electromagnetic interference. Keep the device dry and do not expose it to extreme temperatures to ensure safe and reliable operation.