no tetra signal ?

[bruno77]

I there..‘ Morning every one..

I got a strange signal , I thaught it was tetra but nothing decode…
it’s near the 466 mhz and it appears and stay a short time before desapearing..

First of my questions : is tetra signals always stay in waterfall or just appear like this ?
Second one , if it is not tetra…what is it ???

would you like me to show you a picture of that signal...and why not a sound streamed...??

Thanks for all of your posts

Best regards..
Bruno.

 

[LimaZulu]

Did you checked this?
https://www.sigidwiki.com/wiki/Signal_Identification_Guide

Also, you can provide at least one screenshot of zoomed waterfall. Some additional information would be nice - what software did you try to decode it, some sound sample, etc.

 

[bruno77]

ok great unidentified waves form...
see my attachement files here...
i try to link a video next....

 

[bruno77]

yep i done it..i use gqrx...
here it is.. (at 0:25 ' )

https://youtu.be/wFzpS-u64PQ

it's come at differents frequencies but nears each from others...
if you get an idea..(push louder the sound....bad recording )

 

[DaveNF2G]

Another possibility if you cannot decode a signal is that you are receiving it on an image frequency.

 

[bruno77]

i dont think it is because it's strangely clear and right on the amplitude..it not seem to be an artefact..
the sound looks like tetra but with a kind of "roger bip" before...

interresting....

 

[paparazzo]

Hearing the Audio i can tell you, this is no TETRA Signal. It sound like a Paging Transmitter from POCSAG or similar.

 

[bruno77]

that's right...it realy looks like pocsag...thank you paparazzo...
i gone try to see that with my gnu
i think i can find some grc to try to see if it is really...

nice ..

 

[LimaZulu]

Don't know what type of data is, but it is definitely not TETRA.
It really sounds like paging system but transmission is too short for a regular page message

 

[ansul1001]

Looks like and sounds like a personal weather station data transmission

 

[grosminet]

These are traditional well knows French POCSAG frequencies

 

[bruno77]

absolutely grosminet, how does titi feel ?

shure it was pocsag, besause i decode ti with "PDW "..i bring the signal straight from my mixer to another pc sound card line in connected...so it decode .i try now with gqrx and multimon-ng in localhost reply...
paparazzo means right..

**does any one have a gnuradio example of gfsk decode (or any else adapted for ...why not qam adapting) for decode pocsag too ? **

many thanks to all of you....


best..