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Service Instructions
Item 4: Maximum Deviation
Purpose:
Checking and, if necessary, calibrating the maximum deviation of the transmitter
Test method:
Radio test set in TX mode
Input signal:
1kHz sine wave signal at 320mV
Measurement point:
At the antenna connector measured with a deviation meter
Tolerance:
±7.2kHz -1dB (6.462 - 7.200 kHz)
Procedure:
1. Set TXSENS programmable gain stage to nominal value (TP-7, value 7)
2. Enable the compandor (TP-29:1)
3. Connect a 1kHz sine wave signal at 320mV
4. Turn the transmitter on (TP-2:2)
5. Monitor RF peak deviation
6. If the deviation is outside the limits; adjust the deviation
7. Enter TP-14
8. Start the trimming by pressing M + #
9. Trim audio deviation to 6.462 - 7.200 kHz by pressing # and * to increase/
10.Press M + S to store the value
14
decrease the deviation
Allowed trim values are 2 to 13
Trim step size is 0.4dB per step
to ATMS (system connector)
RMS
to ATMS (system connector)
RMS
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