The Siren Board

Discussion of Outdoor Warning Systems
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PostPosted: Wed Jul 10, 2019 4:29 pm 
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Real Name: Calvin Williams
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I have the Franklin County siren control frequency (158.925) on my scanner and after the noon test they're still sending out DTMF strings even though the sirens aren't going off anymore.

It's currently 12:30 and they are still sending out DTMF strings as I am typing this. Perhaps they're doing some kind of silent test or addressing an individual siren?


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PostPosted: Wed Jul 10, 2019 4:41 pm 
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Would seem to me it's likely each individual RTU phoning home. They all can't transmit at once or else you'd just have a bunch of noise on the radio channel that couldn't be decoded.


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PostPosted: Wed Jul 10, 2019 4:53 pm 
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I didn't think of that. I got it on video: https://www.youtube.com/watch?v=2M3J14iN4Bg

It's currently 12:52 and it is still happening.

Video link is unlisted so only those with link can see btw.


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PostPosted: Wed Jul 10, 2019 11:46 pm 
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Polling the sirens for activation status. With the amount of sirens that county has it would probably make sense.

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Proud owner of a PA speaker and 18 2-way radios.


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PostPosted: Thu Jul 11, 2019 2:05 am 
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That's what someone else told me on my instagram, siren polling. Didn't know that was a thing until now but makes sense.


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PostPosted: Thu Jul 11, 2019 2:46 pm 
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CrazyCalvinWilliams wrote: *
That's what someone else told me on my instagram, siren polling. Didn't know that was a thing until now but makes sense.
most systems with 2-way communication utilize it for activation status and to make sure sirens work. This is one of the reasons why some systems have individual frequencies so they don't tie up other frequencies.

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At first I was uncertain... Now i'm just not sure.
Proud owner of a PA speaker and 18 2-way radios.


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