Dispatch Beeps

[Joseph11]

On a local police and EMS frequency, whenever the dispatcher keys-up, there is a two-toned multi-frequency beep right before they speak. Attached is the beep before they speak (sound1.mp3 and sound1a.mp3) and the beep after they've finished speaking (sound2.mp3). I zipped all three files. Does anyone know what these indicate? The beep in sound2.mp3 just started today. Also, does anyone know the tones and durations for these beeps? Thanks.

 

[RyltnVFD]

1 and 1a sound the same. I occasionaly hear them on my Medic channel thrown about as if the dispatcher accidentaly hit a wrong button.

Not sure about 2.

Not quite sure what they're for, although I think it's just to differentiate the dispatcher's traffic from the other units, in case someone doesn't recognize the dispatcher's voice. Just my guess, I dunno.

 

[N4DES]

Those are the key up tones that wake up the repeater and tell it to begin transmitting.
If it just started they could of either changed their repeater to a new one that requires key-up tones
or they relocated it to a new location and now require telephone RT circuits to key up the repeater.

The third one could be that the filtering is no longer working and that is why you hear it...but I doubt this is why....

 

[MNRotrMedic]

I don't think that the tones are necessarily tied to repeater usage. I say this because in my area both the private EMS service dispatcher and the local ER have very similar 'beeps' when they key up. I think that it may be just to let the operator who is sometimes a complete idiot when it's ok to begin speaking.

 

[Buckskinner33]

Matt, what kind of system did you record this from?
BTW.. I like your tag line

 

[xusmarine1979]

It wouldn't have anything to do with the radios?

 

[nd5y]

Those are tone remote tones. The consoles, desktop tone remotes, base stations, voters, remote receivers, etc. send various guard tones and functions tones over the phone line, microwave link, etc. to eachother to control various functions.

 

[Joseph11]

Interesting. Thanks for the replies. Anyone know the frequencies and durations of the tones?

 

[nd5y]

Download this Tone Signalling Chart (.pdf document) Tone Remote
Tones are on page 6 http://www.midians.com/html/tone_signaling.asp

 

[Joseph11]

Thanks, that's a very nice PDF. Which one is it?

 

[MNRotrMedic]

Matt, what kind of system did you record this from?
BTW.. I like your tag line[/QUOTE

I didn't record the tones, but thanks anyway!

 

[GottIstGutig]

I like how they sound.

 

[SlipNutz15]

Some of the kenwood radios in Lycoming County have the identifier system built into them and they sound like that every so often on dekey

 

[xusmarine1979]

I like how they sound.

We have a VFD in our county that has one. I think it makes it sound pretty cool.

 

[mikegilbert]

Those are tone remote tones. The consoles, desktop tone remotes, base stations, voters, remote receivers, etc. send various guard tones and functions tones over the phone line, microwave link, etc. to eachother to control various functions.

The most common tone remote frequencies are the 2175hz initial beep, and the 1950hz secondary tone, followed by the 2175hz guard tone. If I tune into the RF links for our VHF firecom system here in Oregon, I can hear the un-filtered tones going across to the remote bases.

-Mike

 

[Joseph11]

Thanks, do you have the durations of those tones?

 

[nd5y]

Thanks, do you have the durations of those tones?

I posted a link to Midian Electronics' web site earlier. http://www.radioreference.com/forums/showpost.php?p=147487&postcount=9
Their tone chart has the frequencies and durations for tone remote tones.

 

[gg750]

We have a repeated system where I work. It takes a second (give or take) after pressing the PTT button for the repeater to kick in. The base and some of the new portable radios will emit a short double tone like that to notify the user that system is ready for transmitting.

G

 

[Joseph11]

Hmm, interesting.

 

[Al42]

We have a repeated system where I work. It takes a second (give or take) after pressing the PTT button for the repeater to kick in. The base and some of the new portable radios will emit a short double tone like that to notify the user that system is ready for transmitting.

Could be a trunked system.