Abell TH-308GB UHF, Servise Manual

Page: 35 / 44

TH-308GB UHF SERVICE MANUAL
- 34 -
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 VR3 Adjust to center
frequency
Within ±100Hz
2. Power
(PC mode)
1)CH: TX low
Battery
terminal: 7.5V
PTT: ON
Power meter
Ammeter
Antenna
VR1 Adjust to 3W
±0.1W
3.
Maximum
DEV
1)CH: TX
center
AG:
1KHz/120mV
PTT: ON
Adjust to
±4.2KHz( wide ),
Narrow check
±1.8KHz～
2.2KHz
(+、- peak whichever
is maximum )
±100Hz
4.MIC
SENS
1)CH: TX
center
AG:
1KHz/12mV
Modulation
Analyzer or linear
detector
(LPF:15KHz)
Oscilloscope
Audio generator
Audio voltmeter
Antenna
Speaker
VR5
Check
(+、- peak whichever
is maximum)
±2.2KHz～
3.6KHz(wide)
±1.1KHz～
1.8KHz(narrow)
5.QT DEV
(PC
MODE)
1)CH: TX
high
QT:67.0Hz
Modulation
Analyzer or linear
detector
(LPF:300Hz)
Oscilloscope
Audio generator
Audio voltmeter
Antenna Adjust to
±0.75
KHz(wide)
Adjust to
±0.35
KHz(narrow)
±50Hz
±50Hz
6.DQT
DEV( PC
MODE )
1)DQT:023N
TX center
Modulation
Analyzer or linear
detector
(LPF:3kHz)
Oscilloscope
PC key Adjust to ±0.75
KHz(wide)
Adjust to ±0.35
KHz(narrow)
±50Hz
±50Hz
7. Battery
level
(PC
MODE)
1) Battery
terminal
：
5.8V
Digital voltmeter Battery PC key Adjust so that the LED
flashed
The LED must flash