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Author Topic: Question: What's that sound?  (Read 2094 times)

ETM71

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Question: What's that sound?
« on: December 29, 2010, 1424 UTC »
What is the machine gun/bubbly laser sound that I hear all over the bands? Was hearing it alot around 6950kHz last night. Quick "zapzapzapzapzap..." noises. Is is OTH radar? It would be great if there was a place to look up unknown (to yourself, at least) noises heard on the HF bands.
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Offline Seamus

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Re: Question: What's that sound?
« Reply #1 on: December 29, 2010, 1704 UTC »
If I am thinking of the sound you are describing, then I believe it is either OTH radar or ionosonde transmissions. 

The sweeps last for a few seconds each, jump around the band, and vary in speeds, right?  If you hear them strong and clear, you'll usually get three beeps just before the sweeping starts, right? 

Sometimes you'll hear just one speed, sometimes you'll get two or three, and occasionally you'll get what I think of as a "full diagnostic sweep" with every flavor from the fastest burr to the slowest "whoop-whoop" that they generate.
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ETM71

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Re: Question: What's that sound?
« Reply #2 on: December 29, 2010, 1737 UTC »
« Last Edit: December 29, 2010, 1741 UTC by ETM71 »
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