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What's this sound?

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mtindor

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Some sort of trunking CC? Just some telemetry kind of thing? It's constant though, 24/7.

http://www.ovscan.com/SS/whats_this_sound.wav

471.2875 - Only thing in Tri-state area (OH/WV/PA) licensed is Transit Authority up in Butler/Beaver PA areas. And I can hear all their other traffic on other frequencies with similar signal strength - so I imagine it has something to do with the Transit Authority.

Just wondering if anyone knows what this is.

Mike
 

jim202

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Sounds like control channel data.

Jim



mtindor said:
Some sort of trunking CC? Just some telemetry kind of thing? It's constant though, 24/7.

http://www.ovscan.com/SS/whats_this_sound.wav

471.2875 - Only thing in Tri-state area (OH/WV/PA) licensed is Transit Authority up in Butler/Beaver PA areas. And I can hear all their other traffic on other frequencies with similar signal strength - so I imagine it has something to do with the Transit Authority.

Just wondering if anyone knows what this is.

Mike
 

WayneH

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There are some obscure Transit systems out there. I believe this is telemetry/MDT though. Definitely not Motorola or EDACS.
 

902

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Sounds like a Motorola Metrocom MDC-4800 (state of the art in 1982) control system that can transmit data to mobiles. It's been like 15 years since I've worked on these. Some of the systems can send signpost data from mobiles to a (VAX or MVME, not a PC) computer system. Some may be able to send GPS (or more likely, LORAN-C from back in the day) positions. One system allowed a "Request to Talk" and rudimentary channel steering for quasi-trunking operation to a voice channel to the dispatcher. Motorola did market them to transit authorities around the country and some NJ Transit busses had a similar system. Not sure what's in western PA.

Scanners can't demodulate mobile data transmissions, even though they may sound like a control channel. There was a big deal many years ago where a manufacturer didn't encrypt their transmissions and some bright people figured out a hack to read what was going across the air. Modern law enforcement systems encrypt signals or use a proprietary signaling format. Don't expect to pull anything exciting or even anything of value.

I file these under the 'That's nice/ Frequencies to skip' catagory.
 
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