TM 55-1930-209-14&P-12
ALIGNMENT/ADJUSTMENT
I.
PLL Circuit
Prior to alignment of the PLL circuit, connect test equipment as shown in Figure 6.
1.
Select channel 01W.
2.
Connect the voltmeter, equipped with an RF probe, to the base of QP36.
3.
Preset the slugs of LP35, LP36, and LP71 to the bottom and the slugs of LP81, LP91, and LV03 to the top.
(See Figure 5 below.) FIGURE 5. SLUG ADJUSTMENT
4.
Key the transmitter and adjust LP71 for the maximum RF voltmeter reading.
5.
In the receive mode, adjust LP36 for the maximum RF voltmeter reading.
6.
Connect the voltmeter, set for DC volts (no RF probe), to TP2.
7.
Adjust LV03 for a 6.5 VDC reading.
8.
Select channel 06.
9.
Connect the frequency counter to TP1.
10. Adjust CPO1 to obtain a 6.40 MHz reading on the frequency counter.
11. Connect the frequency counter to TP4.
12. Adjust CP31 to obtain a 134.90 MHz reading on the frequency counter.
13. Key the transmitter and adjust CP33 to obtain a 156.30 MHz reading on the frequency counter.
14. Connect the voltmeter, set for DC volts, to TP5.
15. Adjust LP81 to obtain the same voltmeter reading on channels 01W and 06.
16. Connect the voltmeter, set for DC volts, to TP51.
17. Key the transmitter and adjust LP91 to obtain the maximum voltmeter reading on channel 06.
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