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.
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