Signalling Deviation - Motorola HT-1000 Service Manual

RX VCO Crossover
Procedure

Signalling Deviation

DTMF Tuning
High Speed Signalling
1. From the SERVICE menu, press F3 to select RECEIVER alignment.
2. Press F5 to select the RECEIVE VCO CROSSOVER softpot. The
screen will indicate the receive test frequency to be used.
3. Connect a dc voltmeter capable of 1mVolt resolution to test point
5 (TP5), which is accessible through a hole in the bottom side VCO
circuitry shield.
4. Beginning with the default softpot frequency of line 2, adjust the
UP/DOWN arrow keys until the voltage reading at TP5 is
3.0 ±0.1volts.
5. Press F8 to program the softpot value.
6. Press F10 twice to return to the SERVICE menu.
Transmit deviation balance compensation and transmit deviation
limit adjustments should be completed before signalling deviation is
adjusted.
1. From the SERVICE menu, press F4 to select SIGNALLING
alignment.
2. Press F2 to select the DTMF softpot.
3. Press F6 to key the radio on the test frequency. The screen will
indicate that the radio is transmitting.
4. Measure the DTMF deviation on your service monitor.
5. Use the UP/DOWN arrow keys to adjust the DTMF deviation per
Table 18.
6. Press F6 again to dekey the radio.
7. Press F8 to program the softpot value; press F10 to return to the
SIGNALLING menu.
1. From the SERVICE menu, press F4 to select SIGNALLING
alignment.
2. Press F3 to select the TRUNKING HIGH SPEED softpot.
3. Press F6 to key the radio on the test frequency. The screen will
indicate that the radio is transmitting.
4. Measure the TRUNKING HIGH SPEED deviation on your service
monitor.
5. Use the UP/DOWN arrow keys to adjust the TRUNKING HIGH
SPEED deviation per Table 18.
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