So you would be looking for a speaker for use in the cockpit rather than wiring into an intercom or headset?
This is for use in gliders, and we do not use headsets. If PAW wishes to enter the glider market, it is a problem that needs addressing.
(I suppose the aircraft headset has a different 5v source, so does not have this PAW interference.)
I presume the main problem is the pulsed transmission from the PAW aerial, which I understand goes out at 5hz - the same as the interference clicks. In the old days of motor mechanics, we used to put a suppressor (a capacitor) across the ignition coil, to prevent similar feedback. Would that help? A capacitor across the 5v output from the dc converter? If so, what type and size of capacitor?
I will also try taking the power from the Raspberry output, to see if that smooths out the 5v current a bit. But I have to connect it to the car, as that is my only 12v battery source.
Cheers,
R