Uniden 2020, Руководство пользователя, Страница: 2 / 26

UNIDEN 2020
Sid 2 (26)
3. R.I.T CIRCUIT ALIGNMENT
3-1 Test Equipment Required
( 1 ) None
3-2 Adjustment Procedures
( 1 ) Set the main dial at 50, on any BAND or SEGMENT selection.
( 2 ) Pull out RF ATT knob and make the marker oscillator work to obtain about
1,000 Hz beat.
(
3 ) Set R.I.T knob to 0 at the WIDE (normal) position.
( 4 ) Adjust potentiometer R665 in AVR unit to obtain the same beat at ON or
OFF of the R.I.T SWITCH.
(
5 ) Again try the same adjustment on R664 in AVR at the NARROW (pull)
position of R.I.T.
4. S-METER ADJUSTMENT
4-1 Test Equipment Required
( 1 ) Standard Signal Generator (SSG)
4-2 Adjustment Procedures
( 1 ) Connect SSG output to antenna jack.
( 2 ) Set MODE SWITCH to USB.
( 3 ) Set BAND SWITCH to 14.0, SEGMENT SWITCH at 200/300, and tune the
main dial to recive 14.200 MHz signal.
(
4 ) Turn RF GAIN CONTROL fully clockwise.
( 5 ) Turn RF ATT CONTROLL fully clockwise.
( 6 ) Tune PRESELECT knob to obtain maximum nois output.
( 7 ) Set SSG frequency at other than 14.200 MHz and keep minimum output
level.
(
8 ) Turn potentiometer R387 in the IF unit fully counterclockwise. Then, return
it slowly clockwise and stop just befor S-Meter start moving.
(
9 ) Feed 40 dB of 14.200 MHz unmodulated output to tranciver, and turn the
dial to obtain maximum S-Meter readings.
(
10 ) Adjust potentiometer R389 on the IF unit, so that the S-Meter indicator S-9
readings.
(
11 ) Set SSG Output at 80 dB.
( 12 ) Adjust potentiometer R392 on the IF unit, so that the indicator shows full-
scale readings.
(
13 ) Repeat ( 9 ) – ( 12 ) adjustment until both prospected readings ar available.