HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: Alain4S on August 19, 2022, 1344 UTC
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(https://i.ibb.co/tzX01YJ/Screenshot-2022-08-19-091554.jpg)
1. Frequency (kHz)
No specific frequency. I've noticed those signals poping up, here and there, in about every HF band, dispersed both on amateur and broadcast bands.
2. Time (UTC)
Any time of the day.
3. Duration
The broadcasts last for very long, several minutes to several hours.
4. Receiver Mode
AM and/or SB
5. Receiver Location
South of Montreal, Canada
6. Description.
The signal consists of 5 kHz wide bursts of what seems to me white noise. They are centered on a frequency (for instance, 11866 kHz) and deviate ± 5Khz, making this mode 10 kHz wide.
Audio sample : https://whyp.it/tracks/37510/audio-sample?token=1ZP4t
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I had hoped that this forum would be frequented by useful people who know about these signals.
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The picture looks like it might be local QRM (interference) to me. The audio recording link goes to a 404 error so I can’t hear what it sounds like.
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Yes, likely interference generated near by you.
I say that because 1) no one else is reporting this and 2) broad signals that appear in random places often are unintended electromagnetic interference from computers or perhaps from power inverters, battery chargers, some motor control circuits. It's hard to point to an exact source at this time.
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Another clue is that it occurs day and night. Signals propagating from afar will not behave in such ways, especially across the HF spectrum.
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