6881094C28-D July 16, 2004
Radio Alignment Procedures: Reference Oscillator Alignment 6-5
- Type 7.1 followed by SPCL button to set the 8901B_ modulation analyzer for maximum
accuracy.
To align the reference oscillator:
1. Select the Reference Oscillator alignment screen. See Figure 6-5.
Figure 6-5. Reference Oscillator Alignment Screen
2. Left-click the PTT Toggle button on the screen to make the radio transmit. The screen
indicates whether the radio is transmitting.
3. Measure the transmit RF frequency with your service monitor.
4. Adjust the reference oscillator’s softpot value until the measured value is as close as possible
to the frequency shown on the screen. See Table 6-1.
5. Left-click the Program All button on the screen to dekey the radio and save the tuned values.
6. Left-click the Close button on the screen to return to the Transmitter Alignments menu.
Table 6-1. Reference Oscillator Alignment
Band Target
VHF ±100 Hz
UHF R1 (380–470 MHz) ±100 Hz
UHF R2 (450–520 MHz) ±100 Hz
700 MHz/800 MHz ±100 Hz
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