
UNIDEN 2020
Sid 15 (26)
3.
LOCAL OSCILLATOR UNIT (PC-092) ALIGNMENT.
3-1.
Test Equipment Required
(
1
) RF Voltage Meter.
(
2
) Frequency Counter.
(
3
) Sweep Generator.
(
4
) Oscilloscope.
3-2.
Xtal Oscillator Output Adjustment.
(
1
) Connect RF voltage meter to TP102.
(
2
) Select BAND SWITCH in order, starting from 15.0 MHz, according to
chart 3-2-1-A and adjust each coils in 3-2-1-B so as to get 1.5V r.m.s. meter
readings, respectively.
Chart 3-2-1
A
B
C
D
BAND
COIL (see 3-2)
Freq. (see 3-3)
TRIMMER (see 3-3)
15.0
L101
37.025 MHz
C116
3.5
L102
25.525
C117
7.0
L103
29.025
C118
14.0
L104
36.025
C119
21.0
L105
43.025
C120
28.0
L106
50.025
C121
28.5
L107
50.525
C122
29.0
L108
51.025
C123
29.5
L109
51.525
C124
27.0
L110
49.025
C125
3-3.
Xtal Oscillator Frequency Adjustment.
(
1
) Connect Frequency Counter to TP102 through 1pF capacitor.
(
2
) Select BAND SWITCH in order starting from 15.0 MHz according to the
chart 3-2-1-A and adjust each trimmer in 3-2-1-D so as to obtain frequency
readings as shown in 3-2-1-C respectively.
3-4.
VCO Buffer Amplifier Adjustment.
(
1
) Connect RF voltage meter to DRAIN of Q113.
(
2
) Set BAND SWITCH to 3,5 MHz.
(
3
) Set SEGMENT SWITCH to 200/700 kHz.
(
4
) Turn and set the dial to 50 (center) readings.
(
5
) Adjust L121 and L122 to get maximum meter readings.
Содержание 2020
Страница 20: ...UNIDEN 2020 Sid 20 26 0 1 uS DIV 0 1 uS DIV 5 uS DIV 5 uS DIV 0 5 uS DIV 0 5 uS DIV 1 A 1 B 1 A 1 C 1 D 1 D 1 C...
Страница 21: ...UNIDEN 2020 Sid 24 26 PLL Unit PC 086 Operation Unit PC 085...
Страница 22: ...UNIDEN 2020 Sid 21 26 1 E 1 F 1 G 1 H 1 H...
Страница 23: ...UNIDEN 2020 Sid 22 26 5 uS DIV 0 1 uS DIV 0 1 mS DIV 5 uS DIV 0 1 mS DIV 1 I 1 I 1 J 1 J 1 K...
Страница 24: ...UNIDEN 2020 Sid 23 26 2 C 2 B 2 D 2 A 2 D 20 Us DIV 0 1 Us DIV 1 Us DIV 0 1 Us DIV 20 Us DIV 20 Us DIV...
Страница 25: ...UNIDEN 2020 Sid 25 26...
Страница 26: ...UNIDEN 2020 Sid 26 26...