So I am trying Wfview with an IC-9700 cnnected remote via WLAN. Receive is working properly but during transmit there is a whistling tone which increases with time and is pumping in SSB - even with no microphone connected. It appears to me like a loopback…
When I wrote “Mic not connected” I meant the mic which is on the wfview end.
At the rig is definitely no mic connected (verified).
I don’t know at the moment if monitor is (accidently) left on… the radio is “remote” and when I write “remote” than I mean that this is not in the next room or in the basement. Therefore it is currently not possible to change anything on the radio (until I have build a mechanical remote device to push a button remotely )
LAN is selected as the audio source
When turning the LAN-slider all the way down, the noise disapears.
If the LAN being turned up is changing it, then the audio is flowing through the 9700. The only way I know to cause this is for the built-in monitor to be enabled. It would have a little stutter before full-tilt feedback would set in.
It only happens when you transmit, right?
FYI wfview streams audio full-duplex the entire time. So when you transmit, that is the moment where the radio begins the built-in monitor function.
I don’t quite understand why that is causing feedback, but it seems likely to me that it is part of the issue.
I should also ask, are you running dual-VFO, and if so, could the sub receiver be receiving the main receiver?
Many thanks for all the advices. Fortunately I could solve the problem:
It was the built-in microphone.
So I wanted to use a netbook with built in microphone (and an external mic jack).
Normally one could expect a single audio-input-device which switches off automatically the built-in mic when using an external microphone. Not in this case. There were two audio-devices, one the internal mic and the other the jack for the external mic. Both were activated and caused an audio-feedback with the built-in speakers. (I know, why I don’t like laptops )
After deactivating the internal mic, the feedback disappeared.