Strange screen shot

[VK3FZ]

any thought as to what sig this is

[VK3TU]

Aliens!

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

[VK1KW]

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.

[VK3FZ]

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

[VK3FZ]

Aliens!

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

no was on wspr freq 50.293 at 2500hz

[VK3FZ]

and hear is another few mins later note the wspr sig no reflections on it

[VK1KW]

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

[VK3FZ]

any how nice pattern something to look at while trying in vane for the vp8 on 20 cw hihihi

[VK7XX]

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..

John

[VK4KAY]

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

Andru
vk4kay

[VK3FZ]

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

[VK3DXE]

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.

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

[VK3FZ]

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

[VK3DXE]

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?

[VK4KAY]

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.

regards
Andru
vk4kay

[VK3FZ]

yes i will have a look later see what happens

[VK2FAK]

Hi All...

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


John