HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: BoomboxDX on April 17, 2026, 0909 UTC
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Earlier this evening I was tuning the 40 Meter CW band, and heard a continuous ditter -- one Dit every 7 seconds, very consistent in placement, like clockwork, S3+ (out of 5), with some fading. As I usually tune the CW section of the 40 M band every late night, this signal is unusual, haven't heard it before. Or, if I have, it was ages ago. As for tone and quality, it was a deliberate sounding dit, not a real quick or sharp one. It was gone by 0900 UTC during a recheck.
The Dit zeroed around 7050.5 or so on my Tecsun PL-330 and XHDATA D808. Both on a second story, indoor 25 ft wire.
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Has this returned anytime recently? Might be worth checking with some remote SDR’s in different locations to rule out the possibility of electronic noise from nearby devices.
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Haven't heard it return, and I'd never heard it there before (or anywhere else in the SW spectrum).
Pretty sure it wasn't a nearby electronic device, as those don't usually propagate or fade. But checking SDR's is probably a good idea next time I hear this, if I do.