A-80 UHF
SERVICE MANUAL
- 40 -
1
.
Band
pass-filter
1) CH
:
RX center
2)Tra generator output -40dBm
Connect the spectrum analyzer to
L103 terminal
Tra generator
Spectrum
Analyzer
ANT
L103
TC301
TC300
Adjust the frequency
so that it becomes the
spectrum waveform
shown in fig1.
2
.
Audio
Lever
1)CH
:
Rx center
SSG output
:
-80dBm(501
μV)
MOD:1KHz
DEV:±3.0KHz(Wide)
±1.5KHz(Narrow)
L35
Adjust to the
maximum AF lever
3
.
Sensitiv
ity
1)CH
:
RX center
CH
:
RX LOW
CH
:
RX HIGH
SSG output
:
-116dBm(0.35
μV)
MOD:1KHz
DEV:±3.0KHz(wide)
±1.5KHz(narrow)
SSG
Oscilloscope
AF.V.M
Distortion meter
Antenna
Speaker
Check
SINAD
:
12dBor
higher
4. Squelch
Level ( PC
mode)
1)CH
:
RX center
MONI
:
on
PC
key
Level 9
Adjust to close the
squelch
The squelch
must be closed
2)Level
9
SSG output
:
-117dBm
3)Level
3
SSG output
:
-125dBm(0.126
μV)
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
1
.
Transmit
(PC mode
1)CH
:
TX center
PTT
:
On
F. counter
PC key
Adjust to center
frequency
Within ±100Hz
2. DQT/QT
Balance
(PC
MODE)
1)CH: TX Center
Modulation
Analyzer or linear
Detector
( LPF3kHz)
Oscilloscope
VR100
Rectify the waveform
to square wave
3. Power
(PC mode)
1)CH: TX low
Battery terminal: 7.5V
PTT: ON
Power meter
Ammeter
Antenna
Adjust to 4.1W
±0.1W