So I was listening to some of the local public transit channels the other day, and I noticed that I kept hearing a form of signaling that I'd never really heard before. It sounds sort of like MDC, but different enough that I'm pretty sure that's not what it is. It sounds like there are two distinct types of data bursts one that's more percussive, and one that's more tonal, like MDC is. Rather than try to describe them, I've uploaded an audio sample of a few transmissions:
http://tindeck.com/listen/zjyz
The vast majority of the radios in the bus fleet are motorola, and the mic / speaker interface looks like a phone handset. Some of the radios seem to emit the data burst on PTT, others do not. Not sure what other info I could include about the system that might be useful. Would love to know what this data is!
What kind of signaling data is this?
Moderator: Queue Moderator
Re: What kind of signaling data is this?
That's GE-STAR signaling. It was available as an option on some Motos, the MTS come to mind.
The bandsplit is only a suggestion.
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KB8YGX
- New User
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- Joined: Thu Jul 12, 2007 10:12 am
- What radios do you own?: AS W7,AS III,XTS2500,HT1250
Re: What kind of signaling data is this?
GM300 does it too.bezking wrote:That's GE-STAR signaling. It was available as an option on some Motos, the MTS come to mind.
Re: What kind of signaling data is this?
Interesting. No way to decode it on my XTS, I presume? Are there any software programs out there that will decode GE-STAR?bezking wrote:That's GE-STAR signaling. It was available as an option on some Motos, the MTS come to mind.
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Johnny Grep
- Posts: 194
- Joined: Sat Feb 15, 2003 6:45 am
- What radios do you own?: M/A-COM's
Re: What kind of signaling data is this?
The one that sounds like a pig squealing is GE-STAR, the other one sounds like some weird proprietary FSK...