Page 12 of 23
DWG ID: 181-0101-01
Date: 2003-08-12
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Adjust the balance SMD potentiometer, A1R180. This is adjusted with a small, non-
conductive, flat blade screwdriver through a clearance hole (MTH1) in the Controller,
A2, CCA. Adjust such that the oscilloscope display shows a square wave with no
rounded corners or overshoot. (This is similar to compensating an oscilloscope
probe.)
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Quit transmitting
•
Turn UUT off
•
Remove the square wave generator
•
Replace jumper A2P2 on header A2J7
5.2.8
TRANSMITTER DEVIATION
Set service monitor to measure transmitter deviation.
Press the “8” key for TRANSMITTER DEVIATION.
Press “T” for 1200-Hz tone and adjust for 2.3 kHz deviation.
5.2.9
TX FREQUENCY TRIM
Press the “9” key for TX FREQUENCY TRIM and set the transmitter on frequency using
a frequency counter connected to the ANT port. The offset voltage at A2P1-7 will be to
2.50 V dc.
Note
: Observe proper power level for frequency counter so you do not cause serious
damage.
ADJUSTMENT COMPLETE
Remove jumper from J8 so unit will be in operating mode. P3 may be stored by attaching
it to one terminal only of J8.