
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.
Содержание 2020
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