Ottawa Fire data sound

[thecanadiangod]

Hi folks, does anyone know what data type is on 420.6875?

 

[exkalibur]

Posting an audio sample would be beneficial.

 

[cheap_ottawa_scanner]

I know that the fire paging on 155.610 is POCSAG 512.
It is a constant signal, and that is outside my experience with "data" transmissions.
What audio quality and website should I use to share a audio recording? Ideally settings that are built in SDR++ for the audio quality part.

 

[mmisk]

Here is a URL to MS onedrive with a video and sound of 420.6875:

URL to 420.6875 - Microsoft OneDrive

 

[cheap_ottawa_scanner]

Oh, neat! I guess the constant pips are a way to be sure the signal is "alive and working". That would make sense.

 

[mciupa]

Quite the location list!

TAFL Search Results

Use this online tool to search for frequencies, locations, or licensees. Infomation comes from Industry Canada's database of frequency allocations.

tafl.mckie.ca

 

[cheap_ottawa_scanner]

I think they are all fire station locations, probably dispatch related.
I admit I never have looked to deeply into fire fighting tech.

 

[thecanadiangod]

It's data of some sort. I've put it through PDW with all decoding options, and nothing was seen. Would love to decode it...

 

[cheap_ottawa_scanner]

I do not have a lot of time right now to search this site https://www.sigidwiki.com/wiki/Database , However later I will make a recording and put it through multimon-ng to see if something hits.

 

[mikewazowski]

My guess would be telemetry to and from the stations for alerting, opening and closing station doors, etc.

 

[cheap_ottawa_scanner]

I did let Multimon-ng sit on the frequency for a day or two and got nothing but garbage output. I do not really have time to look into this further. Maybe one day I will follow what mike suggested and look into telemetry products in the space. Once I had some names I would start looking into if any decoders existed and maybe reverse engineering the protocol if I could find enough technical details about it.

 

[mmisk]

If you do a search for "fire department telemetry" there is some interesting information to read.

 

[smackdaddy]

Congratulations - you found what is called a Zetron 6/26 system. This is typically used for fire hall alerting.

The Model 26 sits at the dispatch side. This unit communicates to the various endpoints using FSK data bursts.

Each fire hall will have a Model 6 terminal. These units will respond when polled with a corresponding FSK burst acknowledgement. If a station is missed, the M26 will beep and the dispatcher will immediately know a station is offline.

On some systems the fire hall alerting audio will come through on this channel. The data bursts will subside, open the PA amplifier and the dispatcher can talk though the speakers in the hall.

The Model 6 has acknowledgement buttons that can be used to acknowledge the call. There can also be contact closures wired in to control local devices. Optionally a handset can be connected to the unit, and can be used to talk back to the dispatcher.