[Lowfer] WWVB clock on 60 kHz

[Garry]

Of course WWVB is pounding in on 60 kHz, but around Chicago there's a 
big problem decoding it with an e-probe. That isn't because of the 60-Hz 
picket fence present here - that's weak compared to WWVB. Rather it's 
because high-powered AM broadcast stations WGN on 720 kHz and WBBM on 
780 kHz mask the signalling with second-order IM. To get around that I 
have to use a loop and aim it at roughly 15 deg (the AM broadcast 
stations are at roughly 105 deg) to null the IM.
-- 
Garry, K3SIW, EN52ta, Elgin, IL
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