The Kenwood AT-120 operating manual provides detailed instructions for setting up and operating the HF antenna tuner, including descriptions of its controls and functions, as well as guidance on connecting it with other equipment. It also includes troubleshooting advice, such as how to measure and adjust the standing-wave ratio (SWR) to ensure optimal performance.
Manual Overview
The Kenwood AT-120 Antenna Tuner is designed for HF amateur radio bands between 3.5 MHz and 30 MHz. It includes an antenna coupler, SWR meter, and antenna switch, and is suitable for both stationary and mobile operations. Troubleshooting involves checking connections and ensuring the BAND switch is set correctly, as incorrect settings can lead to equipment damage. The SWR meter is used to measure the standing wave ratio by first calibrating it with the CAL control, then switching to the SWR position. Calibration and adjustments are critical for optimal performance, with the R TUNE and X TUNE controls adjusting resistive and reactive components of antenna impedance, respectively. For diagnostics, ensure the BAND switch is not operated while transmitting to prevent damage. The unit requires a 12 VDC external power source for meter illumination. For board-level guidance, refer to the schematic diagram provided in the manual. If issues persist, contact a Kenwood service facility.
Quick Issues Covered
- Diagnose SWR meter calibration issues with CAL/SWR switch.
- Troubleshoot power-up failures with external meter illumination.
- Use schematic for circuit tracing and component identification.
Overview
The Model AT-120 is a high-performance HF antenna tuner designed for amateur radio use, suitable for both stationary and mobile operations. It includes an antenna coupler, SWR meter, and antenna switch, and operates on amateur bands between 3.5 MHz and 30 MHz. The tuner features a band-switch for antenna matching or through operation, and the SWR meter functions in both modes. The unit is compact and lightweight, with a mounting bracket for mobile use, and the panel meter can be illuminated by an external power source. The antenna matching circuit also acts as a band-pass filter to reduce TV interference.
Specifications
- Antenna Coupler
- Frequency range: 5 amateur bands from 3.5 to 29.7 MHz
- Input impedance: 50 ohms
- Output impedance: 20 to 300 ohms, unbalanced
- Through power: 150 W max. (3.5 MHz band, 120 W)
- Insertion loss: Less than 0.5 dB at optimum match
- SWR Meter
- Frequency range: 3.5 to 29.7 MHz
- Max. power: 150 W
- Measurable range: 1.0:1 to 10:1
- Min. power required: 2 W
- General
- INPUT Connector: UHF type (50 ohms)
- ANT Connector: UHF type (50 ohms)
- GND: Wing nut and STUD
- Dimensions: 152(6)W x 60(20-3/8)H x 159(6-1/4)D mm. (inch)
- Weight: 1.6 kg (3.5 lbs) approx.
Controls & Indicators
The front-panel controls and indicators of the AT-120 include:
1. Meter: Displays SWR (standing-wave ratio) and requires external power for illumination.
2. CAL (Calibrate)/SWR Switch: Used to measure SWR. Initially set to CAL position for calibration, then switched to SWR position for reading.
3. CAL (Calibrate) Control/Meter Lamp Switch: Used for meter calibration and to turn on the meter lamp by pulling the control.
4. BAND Switch: Selects the operating band and includes a THROUGH position for direct antenna-transceiver connection. Caution is advised not to operate this switch while transmitting.
5. R TUNE: Adjusts the resistive component of antenna impedance.
6. X TUNE (Transmit Tuning) Control: Adjusts the reactive component of antenna impedance.
Installation / Setup
Refer to the PDF for details.
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 Operation manual (PDF – 415.1 KB)
Kenwood AT-120 Operation Manual PDF (415.1 KB): Guides technicians in troubleshooting, calibrating, and assembling the AT-120 model.
- Brand: Kenwood-at-120-operation
- Model: MANUAL
- Type: Operation manual
- File size: 415.1 KB
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 operation manual (PDF)
Kenwood-at-120-operation Overview
The Kenwood-at-120-operation is a versatile communication device designed for reliable and clear audio transmission in various professional and personal environments. Ideal for both indoor and outdoor use, this model ensures seamless connectivity and robust performance, making it perfect for users who require efficient and straightforward operation.
Main Features and Specifications
- Compact and lightweight design for easy portability
- High-quality audio output with noise reduction technology
- Multiple channel support for flexible communication options
- Long battery life with quick recharge capability
- Durable construction suitable for harsh environments
- Simple interface with intuitive controls
Basic Usage and Operation Tips
To operate the Kenwood-at-120-operation, first ensure the device is fully charged. Turn on the unit using the power button and select the desired communication channel using the channel selector knob. Use the push-to-talk (PTT) button to transmit your message, and release it to listen. For optimal audio clarity, hold the microphone close to your mouth but avoid covering it completely. Regularly check the battery status indicator to avoid unexpected power loss during use.
Troubleshooting and Maintenance
If you experience poor audio quality or connectivity issues, first verify that you are on the correct channel and within range of other devices. Ensure the battery is adequately charged and replace it if necessary. Clean the microphone and speaker areas regularly to prevent dust buildup. For persistent problems, consult the detailed troubleshooting section in the manual or contact authorized service centers for assistance.
Safety Reminder
Always use the Kenwood-at-120-operation in accordance with local regulations and guidelines. Avoid exposing the device to extreme temperatures, moisture, or direct sunlight for extended periods. Do not attempt to disassemble or modify the device, as this may cause damage or void the warranty. Keep the device out of reach of children and use it responsibly to ensure safe and effective communication.