Bleep?
- Thread starter denseglow
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N_Jay
Guest
It can be lots of things from intentional tones, to leaking control tone bursts to unintended feedback.
902
Member
It depends on the system. If it's intentional, it may be a unit ID that is transmitted before the message or something custom that some shop rigged up for the agency. If it's not, it may indicate a problem.
Without maybe a wav file or specific agency name and frequency so that a local person who knows what it is can comment, it's really impossible to say.
Without maybe a wav file or specific agency name and frequency so that a local person who knows what it is can comment, it's really impossible to say.
is it Kent County Sheriff in MI.
http://www.scanmichigan.com/
It's not the MDC1200 in the front , it comes right before that. Thanks!
http://www.scanmichigan.com/
It's not the MDC1200 in the front , it comes right before that. Thanks!
Don_Burke
Member
If you could bag an MP3 of it and post it here, it would help.
Transmitters can be DC controlled or tone controlled. To be operated by DC voltage or switch closures, the repeater controller has to be located somewhere close to the operator console. If the repeater is "tone controlled", there are function tones sent down the control wires or through an RF link when the transmit key is operated that tell the repeater controller to proceed with whatever function is indicated by the particular tone it sees. The initial burst is loud, but is then maintained at a subtone level as long as the Tx key is held down. When the function subtone disappears, the controller drops the Tx function. In some systems, the initial tone burst is muted at the controller, and in others, it's not. Anyway, the function tones can be multiple, which sounds like a very fast trill on a piccolo. Depending on the controller Tx functions and audio paths used to bring the Tx up, there can be a function tone burst when mobiles key the repeater, too.
In multiple function tone sequences, there is usually a very fast sequence of two or more function tones sent out upon key up, and it'll sound like that very fast trill on the piccolo. Of the multiple tones used in a burst, one can be used to tell the controller which channel to key up, one to perhaps tell it which audio path to activate, and another for the actual Tx function.
In some systems, there's also the possibility that the console Tx audio loop isn't muted initially and there's a momentary feedback of audio from the receive side of the console interface system, which of course, sounds like what it is, i.e., a momentary burst of feedback. That receive audio loop is supposed to be muted when the Tx key is operated, but in some combinations of console brands and radio controller audio path systems, the function is either not enabled, doesn't function properly, or just ain't there.
In multiple function tone sequences, there is usually a very fast sequence of two or more function tones sent out upon key up, and it'll sound like that very fast trill on the piccolo. Of the multiple tones used in a burst, one can be used to tell the controller which channel to key up, one to perhaps tell it which audio path to activate, and another for the actual Tx function.
In some systems, there's also the possibility that the console Tx audio loop isn't muted initially and there's a momentary feedback of audio from the receive side of the console interface system, which of course, sounds like what it is, i.e., a momentary burst of feedback. That receive audio loop is supposed to be muted when the Tx key is operated, but in some combinations of console brands and radio controller audio path systems, the function is either not enabled, doesn't function properly, or just ain't there.
scannerrail
Member
hmm I think I heard this before
I spoke with a tech that I work with today. The tone you are hearing is related to something called a tone priority module. That tone you are hearing is the base unit sending a signal to the transmitter keying it up and taking priority over and portable or mobile units that may be speaking. You will only hear it if the repeater has not yet dropped. It is just related to the operation of a repeater system with voters.
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