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4.4
Initial Tuning & Adjustment
4.5
High Reverse Power Alarm
Set RV63 to the required output power.
Connect a known mismatch of the required value to the PA output.
Apply RF drive and Tx key.
Adjust RV52 (reverse power alarm) so that the front panel high reverse power
LED just lights.
Example:
A VSWR of 3:1 can be simulated by connecting an unterminated 150W
3dB pad to the PA output. This will result in a return loss of 6dB.
Note:
Remote indication is available at D-range pin 4.
4.6
Remote Forward Power Meter Calibration
If a remote meter is connected, adjust RV43 (forward power meter) for the remote
reading to agree with the RF power meter reading.
4.7
Remote Reverse Power Meter Calibration
If a remote meter is connected, connect a 50 ohm 3dB pad (with the output open
circuit) to the PA output.
Apply RF drive and Tx key.
Adjust RV57 (reverse power meter) for a quarter of the forward power reading.
02/10/95
M889-00
Copyright TEL
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