Super Star 4900B, Руководство по обслуживанию

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3) Receiver Section
STEP SETTING CONNECTION ADJUST ADJUST FOR
1 RX Sensitivity;
Mode: Receiver
Volume: Fully clockwise
Squelch:
Turn to counterclockwise
CH Selector:19
SSG :
27.185MHz,1KHz,
1uV(-107dBm)
(AM) 60% MOD
(FM) 1.2kHz 0EV
Connect RF signal generator to
external ANT. Jack. Connect
SSVM, Sinadder,
Oscilloscope and distortion
meter across EXT-Speaker out
jack with 8
Ω
dummy load
(Figure-8)
(FM)
T201
T202
T203
T204
T205
(AM)
T206
T207
T208 Adjust the parts of
tuning circuitry with
observing
ADM(Automatic
Distortion Meter)
indicates 20dB SINAD
in AM mode, and adjust
output level of RF-SSG
until speaker out level
reaches about 500
miliwatt (2.0Volt)
Adjust for Maximum
indication on SSVM
2 Squelch Adjustment;
Mode: Receiver
Volume: 500mW (2.0V)
Squelch : TIGHT
CH Selector:19
SSG:
27.185MHz, 1KHz
<Tight> 1 mV(-47dBm)
(AM) 60% MOD
(FM) 1.2kHz_DEV
Connect RF signal generator to
external ANT. Jack. Connect
RF power meter and distortion
meter Across EXT-Speaker out
jack with 8
Ω
dummy load
(Figure-8)
RV2 At each mode, Adjust
the point until the audio
output appeared on
oscilloscope.
3 Signal Meter Adjustment;
Mode: Receiver
Volume: 500mW (2.0V)
Squelch:
Turn to counterclockwise
CH Selector: 19
SSG : 27.185MHz, 1KHz,
1.2KHz DEV
100uV (-67dBm)
Connect RF signal generator to
external ANT. Jack. Connect
RF power meter and distortion
meter across EXT-Speaker out
jack with 8
Ω
dummy load
(Figure-8)
RV1 Adjust so that the 9th
LCD Bar display on the
LCD
4 ASC Adjustment;
Mode: Receiver
Volume: 500mW (2.0V)
Squelch:
Turn to counterclockwise
CH Selector:19
SSG : 27.185MHz, 1KHz,
1.2KHz DEV.
0.5 µV (-113dBm)
Connect RF signal generator to
external ANT. Jack.
Connect SSVM, Sinadder,
Oscilloscope and distortion
meter across EXT-Speaker out
jack with 8
Ω
dummy load
(Figure-8)
Inside on
the
ASC BD At each mode, Adjust
the point until the audio
output appeared on
oscilloscope.