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Author Topic: What signal is this?  (Read 4817 times)
KE5GAE
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Posts: 153




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« on: February 26, 2014, 09:53:21 AM »

I am seeing this on my WSJT-X waterfall:



On 20m, just a short time ago.  What am I seeing?

Basil
KE5GAE

PS.  Since posting the image, it has moved down the waterfall a bit, and only has about two thirds the bandwidth now.
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KE5GAE
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Posts: 153




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« Reply #1 on: February 26, 2014, 03:08:22 PM »

Five hours later:



There is a solitary JT-65 signal (F6ARS) at 410Hz on the waterfall.  The band is all but dead.  I see (and hear) a lot of signals at 14078, but WSJT-X isn't decoding them.

Very strange (to me).

Basil
KE5GAE
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KE5GAE
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Posts: 153




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« Reply #2 on: February 27, 2014, 05:22:04 AM »

So, nobody has any ideas?

It would be nice to know whether it was local interference, or something more widespread.  Was it more widespread?  Given the JT65 traffic that had moved up the band, it seemed to me that it was more widespread.

IAC, it went away sometime last night, and the band is very quiet right now.  I am curious to see if JT65 traffic will pick up to more normal levels on 14076 today.

Basil
KE5GAE
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AG6WT
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Posts: 475




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« Reply #3 on: February 27, 2014, 10:50:21 AM »

My guess is that it's someone experimenting with MT63-2000 which has a bandwidth slightly over 2kHz. MT63 is normally around 14.109MHz. If you see it again try to decode it with Fldigi or HRD.

Ray AG6WT
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K3DCW
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Posts: 212




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« Reply #4 on: February 27, 2014, 01:57:54 PM »

I am seeing this on my WSJT-X waterfall:



On 20m, just a short time ago.  What am I seeing?

Basil
KE5GAE

PS.  Since posting the image, it has moved down the waterfall a bit, and only has about two thirds the bandwidth now.


An audio recording is infinitely more useful than a visual, but making a stab at it, I'd bet that it is Olivia.  The bandwidth of the signal is approximately 500hz, and it appears to have 8 tones, so Olivia (or Contestia) running 8/500. 

73

Dave
K3DCW
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KB4QAA
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Posts: 2450




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« Reply #5 on: February 27, 2014, 03:52:09 PM »

Whatever it is, it has 8 tones.   You can see them in each photo.
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KE5GAE
Member

Posts: 153




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« Reply #6 on: February 27, 2014, 06:06:37 PM »

After disappearing for a while, I've just seen a couple more of these signals.  I'm going to try tuning DM780 to the same frequency, and see if I can decode one as Olivia.  Of course, now that I've got DM780 watching, they are not occuring.
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