User's Manual

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RF Technology T800 Page 20
6.6 Deviation 6 FIELD ALIGNMENT PROCEDURE
6.6 Deviation
1.
Set RV4 (Line Level) fully clockwise (CW).
2. Set the audio to 1kHz, 0dBm, on the line input.
3. Key the transmitter on.
4.
Adjust RV1 (Set Max. Deviation) for a deviation of 5kHz (2.5kHz for narrow band
transmitters).
5. Key the transmitter off.
6.
Carry out the Line Input Level alignment procedure (section 6.7)
6.7 Line Input Level
1.
Set the audio to 1kHz, 0dBm, on the line input, or use the actual signal to be
transmitted.
2. Key the transmitter on.
3.
Adjust RV4 (line level) for 60% of system deviation (3kHz or 1.5kHz for narrow band
systems).
4. If the test signal is varying, RV4 may be adjusted to produce a level of 234mV RMS or
660mV
p-p
at the audio voltage test connector pin 6 to pin 1.
5. Key the transmitter off.
6.8 Output Power
1. No audio input is required
2. Key the transmitter on.
3. Adjust RV1 on the power amplifier PCB for the desired power level at the output
connector.
2
4. Key the transmitter off.
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2
Be sure to set the power below the rated maximum for the model of transmitter. If in doubt, allow 1.5dB
cable and connector losses, and assume that the maximum rated power is 15W. This means no more than 10W
at the end of a 1m length of test cable. This pessimistic procedure is safe on all models manufactured at the time
of writing.