Data on the air. How's it encoded?

Originally Posted by C222

While listening to radio waves on my brand-new scanner I got for Christmas/holidays/Festivus, I came across some noise that sounded like a datastream. I have heard BPSK31 and QPSK31 before and this didn't fit the bill. I have uploaded a clip to my server : http://www.tehcr3w.com/data.wav

If anyone has any idea what encoding this is, I'd love to hear it.


P.S. It suddenly broke out into Morse then didn't go back. Huh. (edit: the Morse came again and said, "TPVQ329 2 G" I have no idea.)

THAT is a paging channel and that noise is paging data, off the top of my ears I can't remember what format of paging but it is alpha-numeric type paging data for sure, I work in news and monitor emergency services on many scanners and we have a couple of nasty VHF paging transmitters that blast that crap out all the time and thats what it is.

Now a good source of frequencies, trunked systems, etc can be found at www.radioreference.com

Not sure what type of scanner you got but hopefully it is a digital (apco 25) scanner. Not all emergency services are going P25, some use other NON-SCANNABLE digital formats or encryption as well keep in mind.

m