Abell TH308G, Руководство по обслуживанию

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ABELL TH-308G VHF Service Manual
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1. Setting 1)Power supply voltage
Battery terminal: 7.5V
1) ： CH: TX Hi
3.7V ±0.2V
2) ： CH: RX Hi
Digital
voltmeter
Tp200
TC20
0
3.7V ±0.2 V
3)
：
CH: TX Lo
2.VCO
lock
voltage
4)
：
CH: RX Lo
check >1.0V
Receive Section
Measurement Adjustment
Specification/
Remark
Item Condition
Test
equipment
Terminal Parts method
1
．
Band
pass-filter
1) CH
：
RX center
2) Tra generator output
-40dBm
Connect the spectrum
analyzer to TP2 terminal
Tra generator
Spectrum
Analyzer
ANT
R512
TC50
1
TC50
0
Adjust the
frequency so
that it becomes
the spectrum
waveform
shown in fig1.
2 ． Audio
Lever
1)CH ： Rx center
SSG output
：
-80dBm(501 µ V)
MOD
：
1KHz
DEV ： ±3.0KHz(Wide)
±1.5KHz(Narrow)
SSG
Oscilloscope
AF.V.M
Check 0.63Vrms
3
．
Sensiti
vity
1)CH
：
RX center
CH ： RX LOW
CH
：
RX HIGH
SSG output ：
-116dBm(0.35 µ V)
MOD
：
1KHz
DEV ： ±3.0KHz(wide)
±1.5KHz(narrow)
Check SINAD
：
12 dB
or higher
1)CH
：
RX center
MONI ： on
2)Level 9
SSG output
：
-117dBm
Level 9
Adjust to close
the squelch
The squelch
must be closed
4. Squelch
Level ( PC
mode)
3)Level 3
SSG output ：
-125dBm(0.126 µ V)
Distortion
meter
Antenna
Speaker
PC
key
Level 3
Adjust to close
the squelch
The squelch
must be closed
Transmitter Section
Measurement Adjustment
Item Condition
Test
equipment
Terminal Parts Method
Specification/
Remark