Please have a look at my 500kHz grabber screens at http://myweb.tiscali.co.uk/wgtaylor/grabber2.html & note the interference, does not effect 137kHz.

I have been seeing & hearing this for about 2 weeks now on & off. When it comes on it can be quite strong & audible & usually stays on for several hours. I can't tie the times to anything such as a local TV etc. Shows on the screen as short bright lines repeating down the display.

Has anyone seen this sort of thing before, the audio is very harsh a low frequency & comes in short bursts. I have attached a capture to show the effect in case it is not there when you look at the grabber, it can be much worse than this.

Thanks for any idea's or info.

73,

Gary - G4WGT.