[ARC5] WWII Jamming

[Robert Eleazer]

In pilot accounts of WWII in Europe you often read of pilots describing German "jamming" of their VHF radios.  This was described as a whine.  

I believe this was not actually jamming but the result of the radars the Germans used.  The Freya early warning radar worked on 125 MHz, and I would assume that they were none too picky about frequency stability or bandwidth used, since they did not use those frequencies themselves for other purposes.  Or perhaps the types of emissions employed by the radars contributed to this?

In one new book I read on the experiences of a P-47 and P-51 pilot in Europe they mention that the technical staff of one unit managed to devise a filter to get rid of the annoying whine in the radios. I would assume this consisted of something like an FL-8 beam filter that got rid of the desired audio frequency, which I guess was associated with the radar rep rate (500 Hz for Freya, I understand).

Anyone else ever hear of this?

Wayne