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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 2.5kHz.
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 (1.5kHz )
4.
If the test signal is varying, RV4 may be adjusted to produce a level of 234mV
RMS or 660m V
5.
Key the transmitter off.
6.8
Output Power
1.
No audio input is required
2.
Key the transmitter on.
Adjust RV1 on the power amplifier PCB for the desired power level at the
3.
output connector.
4.
Key the transmitter off.
____________________
2
Be sure to set the power below the rated maximum for the model of transmitter. If in doubt,
allow 1.0dB cable and connector losses, and assume that the maximum rated power is 30W. This
means no more than 24W at the end of a 1m length of test cable. This pessimistic procedure is
safe on all models manufactured at the time of writing.
Page 16
at the audio voltage test connector pin 6 to pin 1.
p-p
2
RF Technology T220
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