radioboy29
Member
Attached is a file of a sample of a local bus authority and I'd like to know how the tone before the data burst is accomplished.
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MDC-1200 Question
- Thread starter radioboy29
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What it sounds like to me is a tone burst. A tone burst is usually used to tell a repeater to turn on because a transmission is coming. This is very common to hear on repeater input channels in Europe. Of course this is just a guess since there is no information about the equipment and/or location.
b7spectra
EMS Dispatcher
That is definitely an MDC burst. I have it on my radio and sometimes if my portable is on and I key up the mobile, that is what I hear. If I were to play that tone into my radio and I have MDC decode on another one, I would actually be able to tell you what the ID is.
Why they have it at the beginning and end is beyond me, even though my mic gets screwie and will unkey/rekey during a transmission.
Why they have it at the beginning and end is beyond me, even though my mic gets screwie and will unkey/rekey during a transmission.
the tone in the beginning sounds almost like a keying or pilot tone used on voting systems.
radioboy29
Member
More information of the subject; it sounds to me like base can selectively call a single bus without other busses hearing it, though you can hear all the transmissions on a scanner. Is that why the tone at the beginning is there?
b7spectra
EMS Dispatcher
Transit buses can be equipped with radios that have route channels as well as "all call" channels. On a route channel, the dispatcher can "dial up" a specific bus and speak with it and none of the other buses will hear them. When a bus keys up, it goes directly to the dispatcher. This prevents distractions to the other drivers on the road. On an "all call" channel, everyone will hear each other.
b7spectra
EMS Dispatcher
It also prevents the user from talking before the repeater is activated. Mine last about 1 second and when the BEEP stops, I can start talking.
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