UNIDEN 2020
Sid 1 (26)
ACCESSORY CIRCUITS ALIGNMENT
1.
NOISE BLANKER Adjustment
1-1.
Test Equipment Required
(
1
) DC Voltage Meter
1-2.
Adjustment Procedures.
(
1
) Set MODE SWITCH to USB, and recive 14.200 Mhz.
(
2
) Activate MARKER OSCILLATOR by pulling out RF ATT knob.
(
3
) Set NOISE BLANKER SWITCH to OFF.
(
4
) Tune the main dial to generate about 1,000 Hz beat from a speaker.
(
5
) Put the meter to the COLLECTOR of Q119.
(
6
) Adjust L139 and L140 to obtain minimum meter readings.
2.
MARKER OSCILLATOR ADJUSTMENT
2-1.
Test Equipment Required
(
1
) Frequency Counter.
2-2.
Adjustment Procedures
(
1
) Connect Frequency Counter to the Pin 1 (Marker output) of J751 on the
operation unit.
(
2
) Activate MARKER OSCILLATOR by pulling out RF ATT knob.
(
3
) Tune trimmer capacitor C753, so that the counter indicates 25.000 KHz
±
2 Hz..
2-3
Adjustment by Standard Radio Signals
(
1
) Connect antenna-to-antenna jack.
(
2
) Set BAND SWITCH to 15.0 SEGMENT SWITCH at 0/500, and recive 15
MHz Standard Signal (JJY, WWV, etc.)
(
3
) Pull out RF ATT knob to activate MARKER OSCILLATOR.
(
4
) Set MODE SWITCH to AM.
(
5
) Adjust trimmer C753 to make zero beat of calibration signal. It is easlily
adjustable Standard Radio Signal (A2), because double beat is generated.
(
6
) Adjust attenuator control to make the calibration easy against excessive
incoming signal.
Summary of Contents for 2020
Page 21: ...UNIDEN 2020 Sid 24 26 PLL Unit PC 086 Operation Unit PC 085...
Page 22: ...UNIDEN 2020 Sid 21 26 1 E 1 F 1 G 1 H 1 H...
Page 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...
Page 25: ...UNIDEN 2020 Sid 25 26...
Page 26: ...UNIDEN 2020 Sid 26 26...