[R-390] PTO question for R-390/URR

[R390rcvr at aol.com]

Bob:

I have seen 3 or 4 R-390s with this mod. I suspect that it was in fact a 
military mod later in the radios service life, when Cosmos were in the pipeline, 
and not the original R-390 style PTO.

The other possibility is that someone published a hack to put them in the 
R-390.

The fact that all of the mods have used Cosmos PTOs, and not any other mfg., 
makes me think it was a military mod.

It seems to work just fine in the one I have had up and running, so wouldn't 
be in a big hurry to swap it back. I don't think however it would be 
prohibitly difficult to reverse engineer it.

Randy


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