Once a phone call is hooked the received audio is managed like all other sources, PFL/BUS works standardly.
Differently, from normal sources, these three telephone sources need to send back an audio TX to the caller/radio listener.
The TX audio has two different functioning ways:
1 – private mode (with channel PFL ON).
2 – On Air mode (with channel PFL OFF).
That is able to control the GAIN TX from the menu to decrease or increase the TX audio gain “output to the caller”. It’s easy to adjust it
between -20 dB to 20 dB by rotating the GAIN TX knob. The step of the adjustment is 0.1 dB.
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