[Lowfer] Unknown signal

[Garry Hess]

Thanks Todd, I thought a bit more about the frequency and see it can be 
a triple beat among NAA, NLK, and NML4. They're all normally quite 
strong and I'm running the SDR-IQ more "open" than previously to squeeze 
all the sensitivity possible from it. I've also seen similar suspicious 
spurs higher in frequency too and they're no doubt bogus. Too much of a 
good thing isn't good. It's sure easier to separate the real from the 
unreal when the source IDs like NDBs and lowfers.

73, Garry, K3SIW, EN52ta, Elgin, IL