• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

AFSK Paging Link

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Jun 16, 2012
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#2
This shoudlve gained more attention as this type of signal is very popular in the Midwestern areas, especially Illinois and Indiana. AFSK paging link is none other than POCSAG but modulated with the bell 202 AFSK tones. You could try to decode with PDW but that wouldnt be easy because some type of splitter to the pulse train waveform (as POCSAG's actual waveform is a pulse train), so decoding can be possible. Sometimes decoding is an even bigger issue because some systems can contain multiple transmissions in one stream (hence rapidly changing mark and space frequencies during a single transmission). One exists in Chicago at the moment on 454.475 MHz for whatever purpose being done down there....
 
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#4
And that right there is exactly what it is. Actually, the Chicago transmitter I discussed at 454.475 MHz uses multiple transmitters tied to the same receiver, which makes it repeat other mark and space tones (thus mixed modes im assuming). I even got three audio samples from my pro-106 scanner.
 
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#5
I actually edited that page several times and added about 5 or more samples, because half the user database doesn't know what the heck it is.
 
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