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HF Mystery Signals / Re: 13100 +/- Khz mystery signal
« on: March 31, 2024, 2139 UTC »
Recording?  Screenshot?

What you are describing is pretty open to interpretation.  Since you posted I have left a receiver on the frequency, so far have not heard the signal.


Utility / Re: USAF HFGCS message at 20 MHz?
« on: March 30, 2024, 0319 UTC »
Nice find, wish I had recorded it.

Sounds faked / pirate / hoax to me.  In addition to all the reasons ~SIGINT~ points out, it just sounds wrong and forced.  And the voice is synthetic, something you don't find on HFGCS.

And that leads me to why I wish I had recorded it.  I have lots of faked / hoax signals in my recordings, but never faked HFGCS traffic.


HF Mystery Signals / Re: What kind of OTH radar could this be..
« on: March 29, 2024, 1849 UTC »
This is not an OTHR.

I don't know what it is, specifically, but for a variety of reasons (features of or missing from the signal) I know it is almost certainly not a radar.  Or if it is (since almost any signal can be) a radar it is an extraordinarily poorly designed one.  I suspect it is data of some kind, but to get a better handle on what it is would require a different recording, preferably an IQ recording or an audio recording in FM or SSB (I prefer USB) that captures both "carriers" and everything between them.


HF Mystery Signals / Re: 7182-7196 kHz -- digital or radar?
« on: February 29, 2024, 0801 UTC »
Not sure what this is -- it sounds different, and looks more fine-grained, than radars I've heard before, but I'm no expert.

Also, on 7200 LSB, there's a continuous beep-beep in the background.  I know this frequency is heavily QRMed, but this sounds very similar to ALE to me.

Without recordings, date and time in UTC, or a bit more description, there is no way to know what you are describing.

As for the radar, a bit before you posted this the Russian 29B6 radar was on that frequency.  However I don't know how long before you posted this you heard what you heard and it was not on that freq at the time this was posted.


Cupid is about S7 into the Mojave Desert of California today.

Long time no hear.


Heard the Testing announcement, and flipped the source over to the house sound system.  Not super strong into the Mojave Desert tonight, S 7 or so, but perfectly usable.


HF Mystery Signals / MOVED: 6660 LSB 17 SEPT 2023
« on: September 21, 2023, 1425 UTC »

Equipment / Re: Made in China Wellbrook 1530 Loop Antenna?
« on: July 06, 2023, 1834 UTC »
Anyone notice the OIP2 and OIP3 numbers on that site?  I may just be a bit of a skeptic, but I don't think that thing is doing anything but sparking at the stated "90 dBm" (1 million Watts).


Utility / Re: Civilian aircraft on 11175 kHz USB, twice
« on: April 17, 2023, 1213 UTC »
United 1948 called mainsail on 11175 on the evening of the 16th as well.

Got a time for that?


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