Strange screen shot

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Strange screen shot

Postby VK3FZ » Sun Jan 24, 2016 9:31 am

any thought as to what sig this is
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wspr.jpg
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Re: strange screen shot

Postby VK3TU » Sun Jan 24, 2016 10:21 am

Aliens!

Seriously though, is the "2500" reference in MHz?
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Re: strange screen shot

Postby VK1KW » Sun Jan 24, 2016 11:48 am

Looks like 2500Hz on spectrum and judging from your location just out of Tullamarine and the actual Rx frequency (bcn/2m/6m/rptr)
possibly several planes lined up giving multiple doppler shifts approaching and departing your QTH otherwise its Aliens. :P
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Re: strange screen shot

Postby VK3FZ » Sun Jan 24, 2016 12:10 pm

yes thats what i thought but it was not just the one screen was 20 tx periods in a run and not the same timing as wspr
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Re: strange screen shot

Postby VK3FZ » Sun Jan 24, 2016 12:18 pm

VK3TU wrote:Aliens!

Seriously though, is the "2500" reference in MHz?



no was on wspr freq 50.293 at 2500hz
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Re: strange screen shot

Postby VK3FZ » Sun Jan 24, 2016 12:24 pm

wspr2.jpg


and hear is another few mins later note the wspr sig no reflections on it
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Re: strange screen shot

Postby VK1KW » Sun Jan 24, 2016 12:31 pm

Am I seeing that it starts when the wspr signal finishes - could be a sound card fault at tx station of some program feature??
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Re: strange screen shot

Postby VK3FZ » Sun Jan 24, 2016 1:11 pm

any how nice pattern something to look at while trying in vane for the vp8 on 20 cw hihihi
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Re: strange screen shot

Postby VK7XX » Sun Jan 24, 2016 1:56 pm

I have seen patterns similar to this in the waterfall of 'EasyPal' , the digital sstv software. People send sound files that generate these types of things as their "signature" at the beginning and or end of their picture..... it might be something like this..

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Re: strange screen shot

Postby VK4KAY » Sun Jan 24, 2016 2:12 pm

Guys, i am going with the obvious.
You are using a development version of software so probably a graphics translation artifact in programming.
Could be similar to the BOM radar artifacts that are seen from time to time as straight lines.

I dont know much about this particular program code, but if you were translating points from one co-ordinate system to another for display eg. polar to rectangular or some amplitude
intensity to some other display mechanism then mathmatical errors do occur with rounding real numbers. Digital does not equal analogue. etc etc

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Re: strange screen shot

Postby VK3FZ » Sun Jan 24, 2016 2:57 pm

interesting thoughts but decoding the wave file in a release version of the software gives the same pattern
i think the easypal thing might be the go
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Re: strange screen shot

Postby VK3DXE » Sun Jan 24, 2016 9:35 pm

VK1KW wrote:Looks like 2500Hz on spectrum and judging from your location just out of Tullamarine and the actual Rx frequency (bcn/2m/6m/rptr)
possibly several planes lined up giving multiple doppler shifts approaching and departing your QTH otherwise its Aliens. :P


That'd be my first thought. I see some really spectacular Doppler shifted signals when beaming north towards the Tullamarine inbound flightpaths.
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Re: strange screen shot

Postby VK3FZ » Mon Jan 25, 2016 12:06 pm

im getting them today 02:00 on both the old versions of wspr and the new
but the timing is out for a wspr sig
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Re: strange screen shot

Postby VK3DXE » Mon Jan 25, 2016 12:53 pm

OK, having had a closer look on a bigger screen, I'm pretty certain it's not an AE doppler thing.

How often is it occurring?
Do you have any other software running on the computer it is manifesting on? Are you running virtual audio cables?
Can you try using a different computer/radio/antenna?
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Re: strange screen shot

Postby VK4KAY » Mon Jan 25, 2016 3:29 pm

Since WSPR etc saves the audio file, why not run the audio of the "alien" signal (with X files starting again - i think the truth is out there and its an alien.... however)
through another spectrum/waterfall program like spectran or Digipan or Spectrum Lab and see what results come from it.

Does the same pattern occur is the first question to ask and go from there depending on the result.

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Re: strange screen shot

Postby VK3FZ » Mon Jan 25, 2016 3:42 pm

yes i will have a look later see what happens
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Re: Strange screen shot

Postby VK2FAK » Wed Jan 27, 2016 7:22 am

Hi All...

Not sure what that signal is, but I have been seeing that pattern for some time now, I would say years..


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