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Fire frequencies

Communications scanning & radio related discussion for Queensland, covering Brisbane, Townsville, Cairns, Rockhampton etc

Fire frequencies

Postby GME Man » Thu Dec 15, 2016 8:33 am

Hello there, I have been listening to the Dalby fire frequency (466.95000) and Toowoomba (466.15000). I have noticed it is very hard to understand both of them because the transmission sounds really muffled. I have searched on google and cannot find any info about this problem. I'm thinking it may have something to do with the squelch or ctcss/dcs.

Thanks


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Re: Fire frequencies

Postby alinco21 » Thu Dec 15, 2016 8:40 am

Not sure if the GWN P25 network is being used out there or not.

If it is it is then being linked back in to the old analogue network.

Hence the difference would be P25 transmissions on a analogue which does sound different.

just a thought.
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Re: Fire frequencies

Postby GME Man » Thu Dec 15, 2016 8:52 am

Yeah the original Toowoomba frequency (466.6000) has been moved to the GWN a while ago, so maybe it is being linked to (466.1500). The Dalby frequency is still analogue as far as I'm aware.


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Re: Fire frequencies

Postby Comint » Thu Dec 15, 2016 11:30 am

alinco21 wrote:Not sure if the GWN P25 network is being used out there or not.

If it is it is then being linked back in to the old analogue network.

Hence the difference would be P25 transmissions on a analogue which does sound different.

just a thought.

As has been stated previously, the GWN only goes as far west as Jondaryan.
466.950 is on Mt Kiangarow (the Bunya Mountains), which is definitely outside the GWN coverage area.

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Re: Fire frequencies

Postby railscan » Thu Dec 15, 2016 3:17 pm

GME Man wrote:Hello there, I have been listening to the Dalby fire frequency (466.95000) and Toowoomba (466.15000). I have noticed it is very hard to understand both of them because the transmission sounds really muffled. I have searched on google and cannot find any info about this problem. I'm thinking it may have something to do with the squelch or ctcss/dcs.
Thanks Sent from my iPad using Tapatalk


Sub-audible tones (CTCSS/DCS/NAC etc) has absolutely no effect on audio quality. If anything it would be a landline, link or bearer or similar.

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Re: Fire frequencies

Postby Vkfour » Thu Dec 15, 2016 6:06 pm

Agreed, it is the link from the GWN stuff to the old analogue that is the most likely problem, (I say most likely as with radio, anything can happen). When the QFES went digital on the Sunshine Coast, they still have to link through the old analogue system to communicate with stations in their area, but outside the GWN, and it sounded like someone talking in a tank. It seems to be fixed now.
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Re: Fire frequencies

Postby GME Man » Thu May 25, 2017 6:56 am

Ok thanks, wonder if any police and ambulance have done the same?

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Re: Fire frequencies

Postby Kazzaw » Tue May 30, 2017 2:53 pm

GME Man wrote:Ok thanks, wonder if any police and ambulance have done the same?


From what I can hear, there is a noticeable difference listening to QAS from outside toowoomba on analogue, and hearing it patched through in GWN units. GWN sounds more... tinny-robotic sort of. Difficult to explain. Haven't listened to firecom in a while but could probably have a look. Can get a recording if someone is interested in hearing the difference? easy way to find out if its just my mind playing tricks or not lol
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Re: Fire frequencies

Postby GME Man » Tue May 30, 2017 9:40 pm

Yes im interested in the recording.

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Re: Fire frequencies

Postby Kazzaw » Wed May 31, 2017 1:06 pm

I have a few hours off this weekend. I'll see what I can get saturday morning
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Re: Fire frequencies

Postby GME Man » Wed May 31, 2017 9:37 pm

Ok thanks

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