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6
FIELD ALIGNMENT PROCEDURE
4
Measure the carrier frequency at the output connector, and adjust XO1 until the
correct carrier frequency is measured, ± 50Hz.
6.4 Modulation Balance
1.
Set RV3 fully CCW (subtone off).
2.
Set RV1 fully CW (maximum deviation)
3.
Set RV2 mid-position
4.
Set JP7 for flat response
5.
Key the transmitter on
6.
Set the audio input to 150Hz, 0dBm.
7.
Measure deviation and adjust RV4 (line Level) for a deviation of 5kHz
(2.5kHz for narrow band transmitters).
8.
Set the audio input to 1.5kHz, 0dBm.
9.
Adjust RV2 (Mod. Bal.) for a deviation of 5kHz (2.5kHz for narrow band
transmitters).
10.
Repeat steps 6-9 until balance is achieved.
11.
Key the transmitter off.
12.
Return JP7 to its correct setting.
13.
Carry out the Deviation (section 6.6) and Tone Deviation (section 6.5)
alignment procedures.
6.5
Tone Deviation
1.
Remove the audio input.
2.
Key the transmitter on.
3. Adjust RV3 for the desired deviation in the range 0-1kHz.
(CTCSS) coding is not to be used, adjust RV3 fully CCW.
____________________
1
The factory default is 500Hz for wide band (5kHz maximum deviation) and 250Hz for narrow band
channels.
RF Technology T220
1
If subtone
Page 15
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