UNIDEN 2020
Sid 9 (26)
3-4.
Modulator Output Coil Adjustment
(
1
) Connect RF VTVM to Pin 6 of J16 (IF UNIT).
(
2
) Set RF AMP SWITCH on the rear panel to OFF.
(
3
) Set MODE SWITCH to TUNE.
(
4
) Turn CARRIER CONTROL knob fully clockwise.
(
5
) Set STANDBY SWITCH to MANU.
(
6
) Adjust L501 for maximum VFVM indication. It will indicate around
0.2V r.m.s.
(
7
) Reset CARRIER CONTROL fully counter-clockwise and STANDBY
SWITCH to PTT.
(
8
) Connect AG output to the microphone jack and provide 1,500 Hz, 10 mV
output.
(
9
) Set MODE SWITCH to USB.
(
10
) Turn MIC GAIN CONTROL fully clockwise.
(
11
) Set STANDBY SWITCH to MANU.
(
12
) Adjust L504 for maximum meter indication. It will indicate around
0,3V r.m.s.
3-5.
Balanced Modulator Alignment.
(
1
) This alignment should be taken place after completion of OUTPUT METER
adjustment (5-1, 5-2).
*(
2
) Obtain maximum output at 14.2 MHz.
(
3
) Set MODE SWITCH to USB.
(
4
) Connect RF meter to antenna jack.
(
5
) Make sure that MIC GAIN CONTROL is set fully counter-clockwise.
(
6
) Set STANBY SWITCH to MANU and adjust R530 for the minimum meter
indication.
(
7
) Change MODE SWITCH to LSB and USB by yurns, and make presise
tuning by adjusting R530 to get equal meter readings on both modes.
3-6.
AM Modulation Adjustment
(
1
) This alignment also should be made after completion of OUTPUT METER
adjustment (5-1, 5-2).
*(
2
) Obtain maximum output at 14.2 MHz.
(
3
) Set MODE SWITCH to AM
(
4
) Set STANDBY SWITCH to MANU.
(
5
) Turn CARRIER CONTROL to get 120 mV reading on the meter.
(
6
) Connect AG output to microphone jack and provide 1,500 Hz, 10 mV
output.
(
7
) Set MIC GAIN CONTROL to 3 o’clock position.
(
8
) Use Oscilloscope to observe output envelope.
(
9
) Adjust R509 to keep about 80% of output modulation level.
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...