Hangflyer I sent you a couple of PMs a few days ago.Nor sure it's of any use.
So do we have a mixture of the noise 'x' with another rf source 'y' that puts the resultant beat freq bang into the vhf comms band x + y , x-y etc Harmonics of resultant ? Mind boggles.
Is 'y' an oscillator in the receiver that only operates with received signal?
A spectrum analyser where we could see on a screen the rf frequencies and relative strengths would be useful as would being able to listen to the noise.
Many many years of experience working on the thread now.Not being able to actually experience it and listen is working blindfolded and is frustrating.