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Author Topic: Unknown noise on 75 meters  (Read 478 times)
N8NMA
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Posts: 8




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« on: February 07, 2008, 02:37:21 PM »

I have heard noise on 75 meters that I, and many others have been unable to identify. It is on 3.995 and 3.865. I have heard it else where and it is heard statewide here in WV. If anything I was wondering if anyone out there has a directive receive antenna that could give some info on its direction from their QTH. It has a wide signal and sounds digital in nature. Anyone with input would be welcome.

Thanks....Tom N8NMA
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N3OX
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« Reply #1 on: February 07, 2008, 08:35:39 PM »

3865 signal is coming from the NE in the DC suburbs here 0434Z Feb. 8th

3995 is quiet.

73,
Dan
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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
WW5AA
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Posts: 2086




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« Reply #2 on: February 08, 2008, 07:32:40 AM »

Both are the product of AM broadcast from China. Some days the audio from the one on 3.987.5 is clear as a bell and 10 over here in Little Rock. The carrier can be heard from 3.985 to 3.995. Thank goodness for narrow filters!

73, de Lindy
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KC3EF
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Posts: 69




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« Reply #3 on: February 08, 2008, 09:44:27 AM »

Lindy,

Thanks for the explaination.  I have heard the signal many times in MD and thought it was some kind of digital mode I could not identify.

73's
KC3EF
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N3OX
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« Reply #4 on: February 08, 2008, 10:10:09 AM »

Mine's not coming from China... not on a 45 degree heading!

Also, the sun is up in China at 0434Z, right?

So the loud digi thing on 3865 that *I* am hearing is not AM broadcast and *not* from China.  

Dan

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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
N4KZ
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Posts: 598




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« Reply #5 on: February 08, 2008, 10:47:09 AM »

Isn't the signal at the high end of 75 meters a digital shortwave station from Europe using the Digital Mondiale protocol? Germany, I think I've read.

As for 3865, I'm not familiar with that one. Of course, there are hams now using digital voice and digital SSTV and those signals sound quite different than anything we've heard on the ham bands before.

73, N4KZ
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N8UXF
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« Reply #6 on: February 08, 2008, 07:52:08 PM »

Tom its n8hhs new roger beep lol
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N8NMA
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Posts: 8




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« Reply #7 on: February 13, 2008, 08:07:08 AM »

Well I have found out that it is digital...it is what is known as Stanag-4285 MIL using 2400 baud,8 PSK, at a bandwith of 2700Hz. So it's Military and using NATO standard. Not sure where it is from but it is heard in Germany as well.
Thanks to all....73....Tom
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N8UXF
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« Reply #8 on: February 14, 2008, 01:14:22 PM »

dont let Bush know he will want to invade them
lol
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