XIEGU X108G, Руководство по обслуживанию

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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