UNIDEN 2020
Sid 3 (26)
5.
ALC METER ADJUSTMENT
5-1.
Test Equipment Required
(
1
) RF Power Meter.
(
2
) Audio Generator (AG) x 2.
(
3
) Audio Attenuator (ATT)
(
4
) AF Milli- volt Meter (mV)
5-2.
Adjustment Procedures
(
1
) Connect RF power meter to antenna jack.
(
2
) Set two AGs and ATT as described in Fig. 5-2-1, to provide two-tone signals
to the microphone jack.
(
3
) Tune and load transmitter at 14.2 MHz to obtain maximum outout.
(
4
) Set MODE SWITCH to USB.
(
5
) Turn MIC GAIN CONTROL fully clockwise.
(
6
) Set Meter Switch to ALC position.
(
7
) Set AG 1 frequency to 1,900 Hz and AG 2´s to 2300 Hz.
(
8
) Measure each output voltage at the mV and set them to 10 mV.
(
9
) Adjust and set the attenuator just before ALC Meter starts moving.
(
10
) Reduce attenuation for 10 dB and increase microphone input.
(
11
) Adjust potentiometer R388 on the IF unit so that the indicator points the
right end of the green ALC scale on the meter.
1
2
4
3
R = 200 ohm
R
R
R
AG 1
AG 2
ATT
Fig 5-2-1
Содержание 2020
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