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Author Topic: 3550khz  (Read 10529 times)
NO2A
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Posts: 825




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« on: April 17, 2014, 03:36:22 PM »

Has anyone heard what appears to be an am signal on this frequency every night? Last night I also heard a beeping sound,not cw,but a weird beeping sound mixed with whatever else I heard on this freq. Could this be some kind of broadcast?
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KAPT4560
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Posts: 89




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« Reply #1 on: April 22, 2014, 01:36:29 PM »

 Is it French language? I came across these links on Google:

http://hf.ref-union.org/c4_iaru_r1/08cavtat/documents_preparatoires/CT08_C4_18%20REF%20AM%20center%20of%20activity.pdf

http://forums.qrz.com/archive/index.php/t-57955.html
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NO2A
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Posts: 825




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« Reply #2 on: April 22, 2014, 02:09:01 PM »

That could be what I heard,but I couldn`t tell what language it was cause there was too much garbage on that frequency. I still haven`t figured out what that beeping sound was. It wasn`t a "roger beep" like cb`ers use. It was a steady "beep,beep beep beep" separated by about a second interval between beeps. Strange. This was at night though.
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KJ6ZOL
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« Reply #3 on: April 23, 2014, 04:02:49 PM »

3550 is in the CW/data portion of the 75/80m ham band. In ITU Region 2 hams can only use CW or data up to 3600. I don't know anything about band allocations in Europe or Asia. Maybe you were hearing some sort of data transmission from a ham somewhere. I know of a net that's apparently part voice and part data in the 20m band here in CA. I dunno what mode they use, but their data tx's sound like a blast of static mixed with electronic beeps.
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NO2A
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« Reply #4 on: April 24, 2014, 05:32:45 PM »

It may have been an am station with a digital station right next to it. Whatever it is,I`ve heard the am station(s) before. They could very well be from Europe.
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KAPT4560
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Posts: 89




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« Reply #5 on: April 25, 2014, 10:53:46 AM »

 I also see logged reports of a southern France and Russian OTH radar on 3550 khz. Different carrier and sweep modes are used.
http://www.iarums-r1.org/iarums/news2013/news1305.pdf
http://www.iarums-r1.org/iarums/radar-2013.pdf
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