I'm listening to Sam on 3700 KC.
Unlike the last few times I heard him under WWV,
there is no detectable site switching on this transmission.
I haven't checked the other freqs yet.
With the multiple freqs involved and the timing,
I'm still convinced it's Uncle doing an exercise,
probably DFing. No way some ham has gone to all
this trouble, especially since he would certainly
have been caught by now.

Dave S.