HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: l0ngwire on May 23, 2025, 0337 UTC
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The half-second beeps spaced 2 seconds apart are being simulcast now on at least six different frequencies. In CW receive mode I hear them on 3550 3900 6700 7050 7450 7950 here in central California. Listening on several Kiwi SDRs around the US they are roughly the same signal strength. I have heard them several times over the past year-- the transmissions last about 40 minutes.
I first noticed them on the 40 and 80 meter ham bands on 3900, 3550 and 7050. There was a recent post on HF Underground/Facebook, which i no longer can find, by Jose Luis in South America who noticed them outside the ham bands. I scribbled down his frequencies--I could not hear all of them, but did hear the simulcast beeps on 6700, 7450 and 7950.
Any ideas?
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Update: also hearing the beep on 3150 at 0624 UTC.
Update No. 2: signal gone at 0627 UTC.
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Ok, good, someone else has been hearing them. I've been hearing them for couple weeks now.
Just this evening decided I would trace this out a bit and make sure they weren't emanating from some equipment of mine around the house.(SoCal, IE) Came here after hearing them on Northern Utah Websdr.
I use 3550 and 7050 for CW, if this is one of the clowns building desert beacons on CW frequencies, please remove these frequencies!!
Thanks,
BBQ
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I am hearing them tonight also in central California. I am sure they are not coming from a low power desert beacon as they are heard all over North America and even in South America,
Tonight while listening to my own receiver on 7050 and using a nearby Kiwi SDR, I heard them simulcast on lots of non-ham frequencies:
3150, 4200, 4525, 6700, 7450, 7950, 8700, 9100, 9375, 9500, 9950, 10625, and 11200. HF was very quiet tonight and it was fairly easy to spot the beeps with a Kiwi SDR set to wide steps.
First heard at 0709utc, off at 0740utc.
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Wednesday evening when we had the minor geomagnetic storm and 40M was very dead, I did not hear the beeps on 7050. So I'll infer the might not originate from Southern California.