Following the below debugging methods to adjust the parameters of the small signal board and the power amplifier
board to resume to default setting.
4.1 Machines
Machine
SPECS
Machine
SPECS
DC power supply
Output voltage: 13.8V
RF spectrum
analyzer
Frequency range: 0.1-1000MHz
Output current: maximum 10A
BW resolution ratio: 10Hz
It has perfect protection function
Audio
analyzer
SINAD analysis function
Audio frequency
generator
Output frequency: 100Hz-10kHz
Measuring range: 10mV-10V
Output amplitude: 1mV-1V RMS
Oscilloscope
Frequency range: DC-100MHz
RF signal
generator
Output frequency: 0.1-500MHz
Measuring range: 0.01-20V
Output amplitude: -127dBm-0dBm
Digital
multimeter
3 and a half
Digital ammeter
Measuring range: 0.001-10A
External
speaker
8
Ω
& 2W
All equipment has been measured and tested within the period of validity.
4.2 Small signal board debugging
4.2.1 The small signal board has used the network analyzer to adjust the channel to the predetermined status.
Please do not make any adjustments to the IF transformer on the channel, otherwise it will cause the
deterioration of the transmit-receive capability.
4.2.2 Receiving channel gain debugging
Required machines and its settings
Machine
Setting specs
RF signal source
Frequency: 14.251MHz, output amplitude: -97dBm
Oscilloscope
the units on the X-axis
：
1ms
，
the units on the Y-axis
：
100mV
Note: During the test, do not turn-on the X108G to transmit, otherwise the RF signal source will be damaged!
1)
Set the receiving frequency of X108G to be
14.25000MHz,
[
USB
]
mode.
2)
Open [
PRE
],close [
ATT
] and [
AGC
] and [
SQL
].
3)
Adjust the volume to be 1/3.
Part 4
Debugging
Summary of Contents for X108G
Page 4: ...Small signal back panel Local oscillator module BPF module...
Page 29: ...Part 6 PCB Small signal board TOP...
Page 30: ...Small signal board BOTT...
Page 31: ...AMP Power board TOP...
Page 32: ...AMP Power board BOTT...
Page 33: ...Part 7 Radio block diagram...
