>>2939599
I remember hearing the russian woodpecker in late 1987? I thought it was ignition noise. Wasn't until years later I found out what it really was. At my QTH I think I was hearing the pacific Duga (Duga-2?) in the russian far east. Which reminded me of a device I saw in one hams shack shortly after. I did some searching around and found it: a Datong SRB2. I remember asking about it and he explained how it worked but by then 1991 the Duga OTH radar was gone. I do remember him saying it worked quite well but required the person who was talking to speak slower than usual to be understood. Subsequently found this youtube video showing it in action. https://www.youtube.com/watch?v=EmBUHvFi6Ew

Anyone know of any good technically detailed book about the Duga OTH system?