1.3.9 Receiver Squelch Setting
Under the computer test mode, select “the 9
th
squelch” and click “adjustment” to enter.
Input the receiver with the signals of 1kHz modulation frequency, 3kHz frequency
deviation, and -117dBm level. Adjust the figure to make the green light flash.
Under the computer test mode, select “the 3
rd
squelch” and click “adjustment” to enter.
Input the receiver with the signals of 1kHz modulation frequency, 3kHz frequency
deviation, and –124dBm level. Adjust the figure to make the green light flash.
1.4 Debugging
The above debugging refers to Table3, Table4, and Table 5.
Table 1.3 Voltage Controlled Oscillator (VCO)
Item Test
Condition
Test
Equipment
Test Point
Adjustment
Part
Requirement Note
Setting Battery Power
:
7.5V Digital
Multimeter PD
CH
:
RX Low Frequency
C180
1.0V±0.1V
Adjustment
CH
:
RX High Frequency
Lower than
3.5V
Watch
CH
:
TX Low Frequency
C181
1.0V±0.1V
Adjustment
Locked
Power
CH
:
TX High Frequency
Lower than
3.5V
Watch
Table 1.4 Receiver
Item
Test Condition
Test Equipment
Test
Point
Adjustment Requirement
Note
Band
Pass
Filter
Spectroanalizer/
Comprehensive
Test
Device
Before
Mixing
Computer
Test Mode
Not
recommend
the user to
adjust it!
Audio
Level
Test
Frequency
:
MF
Antenna Input
:
RF OUT
:
-53dBm(501µV)
MOD
:
1kHz
DEV
:
±3.0kHz
Audio Load
:
16
Ω
(Turn
the
volume knob
clockwise)
Audio power
>
0.3 W
Inner
speaker
power
>
1.2W
Sensitivity
CH
:
MF
CH
:
LF
CH
:
HF
RF OUT
:
-116dBm(0.35µV)
MOD
:
1kHz
DEV
:
±1.5kHz
Computer
Test Mode
SINAD
:
12dB or
higher
Squelch
Activation
Sensitivity
CH
:
Receiving
Center
Frequency
RF Audio Signal
Generator
Oscillator
Audio Voltmeter
Distortion Test
Device
/Comprehensive
Test Device
Speaker
Connector
After
adj
ustment,
squelc
h