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Author Topic: Constant tones on 6925 USB  (Read 1907 times)

Offline Treehouse SWL

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Constant tones on 6925 USB
« on: January 07, 2019, 0714 UTC »
Around the clock in recent weeks on 6925 kHz USB, I'm getting a long tone that lasts for 20-30 seconds, ends for a second or two, and then resumes.

Anybody know what that might be? It's made hearing weak pirate signals really difficult here.
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Offline MDK2

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Re: Constant tones on 6925 USB
« Reply #1 on: January 07, 2019, 1512 UTC »
If you can make a recording, please do so and share it here. I suspect that you're experiencing something local because I've had no such experience here (QTH Denver) but I have other things like a spur from my local AM station on 1390 that's ever present at 6950 (5th harmonic) which can make receiving pirates at that frequency tricky, depending on the time of day.
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Offline Strange Beacons

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Re: Constant tones on 6925 USB
« Reply #2 on: January 07, 2019, 1648 UTC »
I'm in Seattle. I tuned to 6925 kHz in USB mode and monitored for about an hour and heard nothing. Possible RFI local to your position?

Offline Treehouse SWL

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Re: Constant tones on 6925 USB
« Reply #3 on: January 08, 2019, 2132 UTC »
It could be RF from something local, but the tone seems to have some sort of pattern.

My recording equipment is not fancy (cellphone), but I took a video earlier today; the tone is already going when the video starts; I also included what it sounds like in AM mode, which is a bit less distinguishable: https://youtu.be/wQ1L6Xwu73o
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Offline Strange Beacons

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Re: Constant tones on 6925 USB
« Reply #4 on: January 08, 2019, 2234 UTC »
Interesting. The tone if very subtle, bu definitely there. I'll keep listening for this myself and will see if I can make a recording, too.