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Posted by Bruce WA1HGJ on March 12, 2024 at 12:14:13.
In Reply to: 180 kHz digital? posted by Grundigb400PE on March 10, 2024 at 23:10:34.
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Thanks for posting and welcome to our little corner of the LF spectrum. I haven’t heard your particular signal on 180 kHz, but there are lots of FSK (frequency shift keying) signals in the LF spectrum, particularly below 200 kHz and especially below 80 kHz. Most are identifiable even without decoding by cross referencing against one or more of the multiple online listings of LF stations, by confirming precise frequency. That can be a bit difficult with FSK, but I’ll “park” a known station—I use nearby 24.0 kHz NAA out of Cutler, ME, on VFO B (with attenuator on; it is incredibly strong here) then tune the unknown signal in on VFO A until the tones of the latter sound identical in pitch to NAA. This seems to work pretty well and I can usually get within 0.01 kHz of true frequency just by listening and comparing tones audibly. Regarding 180 kHz, I don’t recall ever hearing or logging an unknown FSK signal there, but will give a good listen next time I scan the LF spectrum. Again, welcome to the forum and hope to see more posts from you. — Bruce WA1HGJ
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