1.6 Audio gain swapping
This doesn't work with Icom rigs and other rigs with no access to background VFO settings....
*** you must read Learning guide 2.10 Icom --vfo mode ***
The IC7000 has only one audio output channel - from the current VFO.
The FTdx101D has two completely separate receivers with separate audio gain controls.
On switching receivers, there appears to be no way of automatically muting the background receiver.
(Unless I have missed something in the user manual!)
piWebCAT has an option to mute the background receiver and set the foreground receiver to its latest level,
The Ftdx101D has a toggling mute function in the CAT menu. I do not use it because other radios don't have it.
The rigs table has an afswap field which is set to Y to enable the facility.
piWebCAT stores the latest foreground audio gain level for each receiver.
On VFO / receiver switching, the audio gain in the background receiver is set to zero
and the audio gain in the foreground receiver is set to its stored value.
Configuration of the AF gain slider:
One record in the buttons table; two records in catcodes ie: A and B.
The linking code field must be 'AFGN' for the above described system to operate.
Using Mumble VOIP - audio source - considerations for audio gain swapping
Sections 10.1 to 10.5 describe the use of Mumble VOIP (Voice Over IP) for remote operation.
In a dual receiver transceiver, if both receivers are used, the remote control of audio gain is desirable.
Furthermore, the use of a received audio signal that is controlled by the audio gain control is needed
for audio gain swapping to operate.
My FTdx101D has three possible sources of receiver audio to feed into the USB audio adapter.
- Rear panel: The 6-pin data connector. The appears to have output only from the Main receiver.
It has a fixed level. The front panel and CAT audio gain controls have no effect.
- Read panel: A 3.5mm stereo jack socket with Main and Sub receiver outputs separate on
the two pins . It has a fixed level. The front panel and CAT audio controls have no effect.
- The front panel headphone socket. This combines the output from both receivers.
The front panel audio gain controls and CAT audio gain controls are effective.
Therefore, if you want to use Mumble remotely, with access to both receivers and have separate control
of AF gain, then you have to use the headphone socket to feed the USB adapter.
In some radios, an attenuator might be needed.
In addition, piWebCAT's audio gain swapping feature (on VFO swap) can only work using CAT
audio gain control and so would have to use the headphone socket.