XIEGU G90 Operation Manual page 45

At this point, the wiring is complete.
Remember to keep the PC audio (speaker) level output low and watch your
ALC level when going onto transmit. Raise the PC output level un�l you see
the ALC just start to respond...and then stop. TX power output will be lower
than the power set as the radio's power output se�ng. This is so the signal
is perfectly clean for digital opera�on and to avoid the radio overhea�ng.
This is normal procedure for digital modes.
You can add clamp-on ferrite RF chokes to
the USB data cable and the audio cable close
to the computer if you experience any stray
RF ge�ng from the radio into the PC. For
be�er performance, loop the wire through
and then around and through the clip-on
ferrite choke again - then clamp it shut. Addi�onal wire passes through the
ferrite choke improve filtering.
The USB-Serial port should be configured on your PC as 19200 bps, 8data bits, no
parity, 1 stop bit.
WARNING! Turning the radio on with the USB-Serial cable plugged into either
the 3.5mm socket in the head or main unit, can cause the radio to think you
wish to update the firmware and you will have a radio that is non-opera�ve
and will have to perform a firmware update before you can use the radio again!!
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