UNIDEN 2020
Sid 14 (26)
2. PLL UNIT (PC-086, PC-087) ALIGNMENT.
2-1. Test Equipment Required
(1) Frequency Counter
(2) RF voltage Meter (RF VTVM)
2-2. VCO Unlocked-oscillation Frequency Adjustment.
(1) Set FUNCTION SWITCH to R. EXT.
(2) Connect Frequency Counter to the DRAIN of Q807.
(3) Adjust L801 so as to get 16.000 MHz counter readings.
CAUTION Don’t use magnetized tools when adjusting PLL unit because
magnetization of VCO coil core may make C/N of oscillation
output worse extremely.
2-3. Bandpass Amplifier Alginment.
(1) Set FUNCTION SWITCH to INT.
(2) Set SEGMENT SWITCH to 200/700 kHz.
(3) Turn and set the dial to 50 (center) readings.
(4) Connect RF voltage meter to the BASE of Q817.
(5) Adjust L804 – L807 to get maximum meter readings. It will indicate
about 0.5V r.m.s.
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