D&R Airence en Proppfrexx USB noise

[AladnaFm]

Hi Bernd,

Since a couple of day we are the proud owners of a D&R Airence mixer.
Only we experience a lot of usb noise.
Specifically when proppfrexx is running a annoying tone is hearable.
When we close down proppfrexx the noise is reduced to almost nothing.
Looks like pf is amplifying the noise rumble.
What can we do about this?

Greetz
Jesper

[radio42]

That sounds like a grounding issue with the USB interface (actually it might be caused by the power supply of the Airence - I guess they even offer an extra product for that issue...) of the Airence when ProppFrexx is 'sending' data to it.
Nothing ProppFrexx can do about, it is just, that ProppFrexx is using the USB interface.
I assume it will be the same with any other application using the Airence interface.
As said above, you should contact D&R for this problem - it is not ProppFrexx causing it!
See here:
http://www.radiowebshop.com/contents/en-uk/d21.html

Many Greets,
Bernd

[AladnaFm]

Ok thank you. I will contact D&R for the usb isolator.