Originally Posted By: VideoTrack
Interestingly, that doesn't appear to be 50Hz mains interference. The frequency is quite variable, verging on white nose perhaps.


Nope, not 50Hz interference. The response isn't particularly variable...a relative straight line could be extrapolated between the the low hump and the high peak.
I was told, today by a sparkie, that in Qld, a carrier freq. is used for signals to solar panel inverters. Also that the inverter may be producing interference. I'll start with a wiring check via the power outlet meter.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe