The Kenwood AT-200 manual provides detailed instructions for setting up, operating, and troubleshooting the antenna tuner, including how to connect it to transceivers, antennas, and dummy loads, as well as how to measure and adjust SWR and transmit power. It also explains the functions of various controls and switches on the device, and offers guidance on maintaining optimal performance and addressing issues like high SWR readings.
Manual Overview
The Kenwood AT-200 manual provides essential guidance for technicians on troubleshooting, calibration, and operation of the antenna tuner. The AT-200 is designed for use with Kenwood TS-520 and TS-820 series transceivers, covering amateur bands from 1.8MHz to 30MHz. It includes an antenna coupler, RF wattmeter, SWR meter, and an antenna switch with four outputs. The manual emphasizes the importance of proper calibration and adjustment to ensure optimal performance. For troubleshooting, technicians should first measure the SWR of the antenna system using the CAL control to achieve maximum meter swing, then switch to SWR mode to read the standing wave ratio. If the SWR exceeds 1.5, further tuning is necessary. The manual details the use of R TUNE and X TUNE controls to adjust the resistance and reactance components of the antenna for minimal reflected power. Error diagnostics involve checking for high SWR, which may indicate a break or short circuit in the antenna system. The manual also provides board-level guidance, including connector types and switch positions for various operations.
Quick Issues Covered
- Diagnose high SWR issues with calibration and adjustment guidance.
- Troubleshoot power-up failures using wattmeter and SWR meter settings.
- Use schematic diagrams for circuit tracing and component identification.
Overview
The AT-200 is an antenna tuner designed for use with Kenwood TS-520 and TS-820 series transceivers. It includes an antenna coupler, through-line RF wattmeter, SWR meter, and an antenna switch. The tuner is suitable for amateur bands between 1.8MHz and 30MHz and features a wattmeter with two ranges (20W and 200W). It can connect to three antennas and a dummy load, and is capable of matching transceivers with wire antennas such as an Inverted-L. The manual covers specifications, preparation for use, controls, operation, circuit description, adjustment, and maintenance.
Specifications
- Antenna Coupler
- Frequency range: 6 amateur bands from 1.8 to 29.7 MHz.
- Input impedance: 50 Ω
- Antenna impedance: 10 to 500 Ω, unbalanced.
- Through power: 200W at max.
- Insertion loss: Less than 0.5dB in well matching state.
- Output impedance: 20 to 500 Ω, unbalanced.
- Through power: 100 W at max.
- Wattmeter
- Type: Through-line wattmeter.
- Frequency range: 1.8 to 30 MHz.
- Measurable RF power: Up to 20/200W, switched.
- Impedance: 50 Ω
- Accuracy: Better than ±10% of full scale.
- SWR Meter
- SWR detection: Toroidal core direction coupler.
- Measurable range: 1.1 to 10.
- Min. power required: 4W.
- General
- Connectors, INPUT: UHF type, 50 Ω.
- Connectors, ANT-1: UHF type.
- ANT-2: UHF type.
- ANT-3: Wire antenna only.
- Dimensions: 166(6-17/32)W x 153(6)H x 190(7-1/2)mm.
- Net weight: 2.8 kg (6.2 lbs) approx.
Controls & Indicators
The front-panel controls and indicators of the AT-200 antenna tuner include:
1. Meter: Reads SWR (standing-wave ratio) and transmit power on 20W and 200W scales, changed with the 200W-20W switch.
2. Wattmeter Range Selector Switch: Selects the wattmeter full scale, either 20W or 200W.
3. FWD-REF (Forward-Reflected Wave Selector) Switch: Allows the wattmeter to read either forward power or reflected power.
4. POWER-SWR (Wattmeter-SWR Selector) Switch: Sets the meter to wattmeter in the POWER position and to SWR meter in the SWR position.
5. CAL (Calibrate) Switch: Used for measuring SWR, set to the CAL position to adjust the meter.
6. CAL (Calibrate) Control: Used to calibrate the meter when measuring SWR.
7. ANT (Antenna Selector) Switch: Connects three antennas and a dummy load to the transmitter, with a THROUGH position for direct connection.
8. BAND Switch: Set to a position of the 1.9 to 28 MHz bands according to the operating band.
9. R TUNE: Adjusts the resistance component of the antenna.
10. X TUNE (Transmit Tuning) Control: Adjusts the reactance component of the antenna.
Installation / Setup
Refer to the PDF for details.
Operation
Interconnect your AT-200 with the transceiver, antenna, and dummy load as illustrated in Figure 5-A. Adjust the transceiver by setting the ANT switch to the DUM position and adjusting for maximum output at your transmit frequency. For measuring the antenna system SWR, set the controls as illustrated in Figure 6, set the ANT switch to the “THROUGH” position, and adjust the CAL control for maximum swing. Then, turn the CAL-SWR switch to the SWR position to read the SWR. If SWR is lower than 1.5, the antenna system is well-matched. If not, tuning is required.
For adjusting the antenna coupler, set the BAND switch to the operating band and the ANT switch to the position of the antenna to be matched. Turn the FWD-REF switch to the REF position and adjust the R TUNE and X TUNE controls alternately until the meter swing is minimum, indicating close to zero reflected wave power. After coupler adjustment, measure the matching state of the transmitter and antenna in a similar manner to measuring the antenna system SWR.
For measuring the transmit power, set the switches as shown in Figure 8. Measure the forward wave power with the FWD-REF switch in the FWD position and the reflected wave power with it in the REF position. If SWR is too high, the measured power may be in error.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Manual (PDF – 247.5 KB)
Kenwood AT-200-OPER Manual: Provides step-by-step instructions for troubleshooting and calibrating the Kenwood AT-200 model.
- Brand: Kenwood-at-200-oper
- Model: MANUAL
- Type: Manual
- File size: 247.5 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
Kenwood-at-200-oper Overview
The Kenwood-at-200-oper is a versatile communication device designed for reliable and clear audio transmission in various professional and recreational settings. Ideal for both personal and commercial use, this model offers robust performance with easy-to-use controls, making it a dependable choice for users requiring consistent communication capabilities.
Main Features and Specifications
- Frequency Range: VHF/UHF bands for wide coverage
- Power Output: Up to 5 watts for clear signal transmission
- Display: Backlit LCD for easy readability in low light
- Battery Life: Long-lasting rechargeable battery supporting extended use
- Channel Memory: Stores up to 128 programmable channels
- Built-in CTCSS/DCS for privacy and interference reduction
- Durable, compact design with water-resistant casing
Basic Usage and Operation Tips
To operate the Kenwood-at-200-oper, first ensure the battery is fully charged. Power on the device using the main switch, then select the desired channel using the channel selector knob or buttons. Adjust the volume to a comfortable level. Press and hold the push-to-talk (PTT) button to transmit your message, and release it to listen. Utilize the built-in squelch control to minimize background noise. For optimal performance, keep the antenna upright and avoid obstructions.
Troubleshooting and Maintenance
If you experience weak transmission or reception, verify the battery charge and ensure the antenna is securely connected. Regularly clean the device exterior with a soft, dry cloth to prevent dust build-up. Avoid using harsh chemicals. In case of persistent issues, consult the manual’s troubleshooting section or contact authorized service centers. Periodically check and update channel programming to maintain communication efficiency.
Safety Reminder
Always operate the Kenwood-at-200-oper in accordance with local regulations regarding radio frequency use. Avoid using the device near explosive materials or in hazardous environments. Do not expose the unit to extreme temperatures or moisture beyond its specified limits. Keep the device out of reach of children and handle it with care to prevent damage or injury.