Line Input And Output; Operation Of Line Output - XIEGU G90 Operation Manual

Line Input and Output

The G90/S has an external line input interface. When the G90/S is used for data
communication in conjunction with a computer or an external modem, the
correct signal input options need to be selected.
1. Feed the external audio signal into the corresponding pin of the ACC port
(see the interface description on page 10).
2. Selecting the U-D or L-D mode, will automatically set the audio input to the
radio to come from LINE input pin on the ACC socket.
3. In the system menu, select: AUX IN VOLUM to set the appropriate input
volume level. (see below)

Operation of line output:

In the system menu, select: AUX OUT VOLUM and set it to the appropriate
output level. Your computer software package will have a meter showing best
input levels.
■ When using digital communications via the ACC port, the TX audio drive level
should be capable of 200mv.
■ The audio output level from the computer to the radio should be adjusted so
that the ALC value displayed on the screen is between 30 and 85. The lower
the ALC value, the better. You should set the radio at your required output level
and then adjust the PC's sound card output so that the radio's ALC is within
range. Excessively high input signal level will overload the input amplifier,
resulting in modulation signal distortion. With the ALC set correctly, the TX
output reading may jump around rapidly under digital modes - but average
power levels will be in the correct range for a clean and effective signal. Digital
modes require much less TX power than other modes to make a contact.
In the system menu, the following two settings are the ones to adjust for data
communications:
5 AUXIN Volum
6 AUXOUT Volum
♦ For digital data communications, the PC output level is adjusted together with
the "Line input volume" (your TX audio) in the radio. The level of the audio input
to the computer is adjusted in conjunction with the radio's "Line output volume"
(received audio going to the PC). The PC settings are normally found under
"Sound devices". It is best to set the radio to a mid-level value and then adjust
the PC's levels to achieve correct operation. Fine tuning from that point can be
done through the G90/S's menu settings.
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Line input volume setting
Line output volume setting