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General| Type | Automatic Antenna Tuner |
|---|---|
| Frequency Range | 1.8 to 54 MHz |
| Power Handling | 100 W |
| L Values | 0.1 to 8.5 µH |
| C Values | 10 pF to 1000 pF |
| Power Supply | 13.8 VDC, 500 mA |
| Current Consumption | 500mA |
Quick start guide for immediate operation and basic connection steps.
Describes the AT-897 front panel, including the Tune button and LED indicator.
Details the five connectors on the back panel of the AT-897 tuner.
Step-by-step instructions for physically mounting the tuner onto the FT-897 transceiver.
Explains how to connect the CAT and Y-ACC cables for transceiver communication.
Details the RF connections between the transceiver, tuner, and antenna.
How to perform standard tuning operations using the Tune button.
Instructions for initiating a full tuning cycle, bypassing memory.
How to activate bypass mode to send RF directly to the antenna.
Advice on selecting frequencies to avoid interfering with other radio operators.
Explains basic concepts of impedance, resistance, and reactance in RF circuits.
Discusses impedance matching and mismatching in radio systems.
Provides the formula for calculating SWR from forward and reflected power.
Explains how to use the provided table to find SWR values.
Describes the switched-L network, relays, and impedance handling.
Explains the Bruene circuit used for SWR sensing and voltage conversion.
Details the microprocessor's internal oscillator, tuning cycles, and algorithms.
Guidance on cleaning the tuner and protecting it from environmental factors.
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