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I've recorded what I believe packet radio signal. I tried few decoding tools on windows to no avail. Can anyone please have a look at this youtube video and tell me how to decode this signal or what it is?

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That is POCSAG (Post Office Code Standardization Advisory Group). Typically used by numeric and text pagers.

Wikipedia also has a sample of the audio that you can compare against.

Some have used rtl_fm combined with multimon-ng to decode POCSAG. A snippet from this site shows:

rtl_fm -N -o 4 -A lut -s 22050 -C -f 148.397M - | multimon-ng -t raw -a POCSAG512 -a POCSAG1200 -a POCSAG2400 -f alpha /dev/stdin
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  • $\begingroup$ Many thanks, I'll have a go with multimon-ng! $\endgroup$
    – Tomas D
    Jul 30, 2014 at 0:51
  • $\begingroup$ Are you sure? I'm not familiar with the protocol nor have I tried to verify with a decoder, but the sync tones at the start of each transmission do not sound the same. $\endgroup$ Jul 30, 2014 at 20:54
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PDW in windows will do just fine... no need to grab a linux box (unless you have one setup). Certainly much easier than some rtl_fm/multimon setup.

http://www.discriminator.nl/pdw/index-en.html

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  • $\begingroup$ Thanks very much for suggesting pdw, will give it a go (; $\endgroup$
    – Tomas D
    Sep 1, 2014 at 4:33

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