We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Author Topic: Mystery Simulcast Beeps on 3550 3900 6700 7050 7450 7950 23 MAY 2025 0325utc  (Read 856 times)

Online l0ngwire

  • Jr. Member
  • **
  • Posts: 91
    • View Profile
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?
« Last Edit: May 23, 2025, 0349 UTC by l0ngwire »

Online l0ngwire

  • Jr. Member
  • **
  • Posts: 91
    • View Profile
Update:  also hearing the beep on 3150 at 0624 UTC.

Update No. 2:  signal gone at 0627 UTC.
« Last Edit: May 23, 2025, 0630 UTC by l0ngwire »

Offline burndup

  • Newbie
  • *
  • Posts: 1
    • View Profile
    • Email
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

Online l0ngwire

  • Jr. Member
  • **
  • Posts: 91
    • View Profile
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.
« Last Edit: Today at 08:25 by l0ngwire »

 

HFUnderground Mug
HFUnderground Mug
by MitchellTimeDesigns