User's Manual

27
Measurement Adjustment
Item Condition
Test
Instrument
Terminal Parts Method
Specification/Remarks
R
eceiving
S
ensitivity
Adjust to
CH1. Press
MON for 1
second to
receive.
Radio
Communication
Test S e t
SSG:
-119dBm,
MOD:1KHz
DEV: 1.5KHz
FILTER:
0.3~3KHz
Antenna
Mic jack
Check
SINAD:
12dB or higher
Adjust to CH1
and set SQ as
level 1
Radio
Communication
Test Set SSG:
-119dBm,
Squelch level:
-122±1.5dB
Squelch
Adjust to CH1
and set SQ as
level 4
Radio
Communication
Test S e t
SSG:
-110dBm,
Antenna
Mic jack
Reduce the
SSG output
signal
gradually until
AF output
mutes.
Squelch level:
-114±1.5dB
4. Transmitter (Be sure to connect the antenna or dummy load before adjustment)
Measurement Adjustment
Item Condition
Test Instrument Terminals Parts Method
Specification/Remarks
±2.5ppm
Transmitting
Frequency
Radio
Communication
Test S e t
VC1
Use ceramic
screwdriver to
adjust VC1 so
that the center
frequency is no
more than the
error.
Transmitting
power
Adjust to CH1.
Press PTT to
transmit.
Radio
Communication
Test Set
Ammeter
Antenna
Check
≥700mW
Max
frequency
deviation
Adjust to CH1.
Press PTT to
transmit
.
Radio
Communication
Test Set
LPF: 15KHz
AF OUT:
1KHz/150mV
Antenna
Mic Jack
R77
Use screwdriver
to adjust R77 so
that frequency
deviation is in the
regulated range.
Frequency deviation:
2.1KHz~2.2KHz
Modulation
Sensitivity
Adjust to CH1.
Press PTT to
Radio
Communication
Antenna
Mic Jack
Check
Frequency deviation:
1.1KHz~1.8KHz