ProVoice or What ?

jeffbrowning · Apr 24, 2008

The south Dallas County cities of DeSoto and Cedar Hill, Tx are switching to a trunk system in May 2008, an officer I know raves about not being heard on scanners (what does he know?) does anyone have a clue what system is going in or how cant I find out if it has ProVoice before I buy a digital trunk scanner, had the Grecom PSR 500 in mind.

FPO703 · Apr 24, 2008

Is it maybe this system?

http://www.radioreference.com/apps/db/?sid=5155

If it is, you're SOL. There are currently no scanners on the market to follow this type of system.

ka3jjz · Apr 24, 2008

However you still might be able to sniff out the details of the system by using a software decoder; and I think - I'm not entirely sure, so someone would have to jump in here that knows - that due to the fact that MPT uses a low speed control channel, a discriminator tap to get the signal is not necessary...

We have several such decoders (including UniTrunker...) listed here...

http://wiki.radioreference.com/index.php/Trunked_Radio_Decoders

73 Mike

Russell · Apr 24, 2008

And, as I recall the voice is still analog.

Blaine · Apr 24, 2008

Russell said:
And, as I recall the voice is still analog.

FWIW - If it is indeed going to be MPT-1327 (and analog)
like Decatur, Tx. PD, it might be pretty easy to follow the
system by just putting the frequencies used by the system
in your scanner, and just locking out the control channel.

I listen every once and a while to the Decatur system, which
comes in quite well here in Flower Mound, and the above
method seems to work OK for me. However, it is a very "light" traffic
system, with only PD on there right now, as far as I know.

If Southwest Regional Comm is to be the same, as in -
JUST FD/PD/EMS, then "perhaps" it might be relatively
easy to follow along with the voice traffic. I can't imagine
that area of the metro being THAT busy, but maybe I'm
off base.

All I know is that so many said Careflite could not be monitored
when they went to the Passport system. That was obviously
proven wrong. I hear all tone outs and everything, just by simply
listening to the "home" channel frequencies.

hiegtx · May 14, 2008

Now hearing what may be an MPT-1327 type control channel on 453.3625, one of the frequencies licensed to SWRCC for their new system. It was not present earler in the week (Monday), or last week. I did not check yesterday.

mbstone99 · May 15, 2008

Swrcc

hiegtx said:
Now hearing what may be an MPT-1327 type control channel on 453.3625, one of the frequencies licensed to SWRCC for their new system. It was not present earler in the week (Monday), or last week. I did not check yesterday.

mbstone99 · May 16, 2008

Swrcc

I am hearing another control channel other then 453.3625/453.3875 for Desoto and 460.0375 for Cedar Hill. This one is on 453.6625 and is reporting a system ID of 0D89, maybe Duncanville?

Matt

andrewccm · May 17, 2008

Lucky there is so much more in this area to monitor if that is indeed the case. As far as digital, I am enjoying listening to Grand Prairie and Mansfield...

hiegtx · May 17, 2008

mbstone99 said:
I am hearing another control channel other then 453.3625/453.3875 for Desoto and 460.0375 for Cedar Hill. This one is on 453.6625 and is reporting a system ID of 0D89, maybe Duncanville?

Matt

Could be, Matt.

That frequency is licensed to Duncanville, with a land mobile trunked coding, under call sign WQHI705.

mbstone99 · May 17, 2008

hiegtx said:
Could be, Matt.

That frequency is licensed to Duncanville, with a land mobile trunked coding, under call sign WQHI705.

I was just about to say it is most likely Duncanville. I did a check and they are licensed on that frequency.

Matt

Russell · May 17, 2008

So should a third site be added for Duncanville with the five freqs listed under that license? Are these sites part of a networked system or are they three seperate and distinct systems? Seems like overkill to have 15 freqs with 3 control channels over a relatively small area. But, then again, I am not up to snuff on MPT-1327 systems.

Russell

hiegtx · May 17, 2008

Russell said:
So should a third site be added for Duncanville with the five freqs listed under that license? Are these sites part of a networked system or are they three seperate and distinct systems? Seems like overkill to have 15 freqs with 3 control channels over a relatively small area. But, then again, I am not up to snuff on MPT-1327 systems.

Russell

Russell,
The Cedar Hill & Desoto sites are both licensed to SWRCC, the shared dispatch entity created by Cedar Hill, Desoto, & Duncanville several years ago. The Duncanville site, on the other hand, is specifically licensed to the City of Duncanville, not to SWRCC.

All three sites, the two licenses to SWRCC in Cedar Hill & Desoto, as well as Duncanville's, list the same control point in their FCC data: SWRCC's address in Desoto. And, all three list the same "contact", PROS LTD.

Knowing the territory, I'd suspect that Duncanville was not satisfied with signal coverage, particularly in the northern half of their city. They may have insisted on a third site, taking out their own license to make sure it happened. The other, less likely possibility, is that they decided to set up their own unique, but interoperable, system. That's unlikely, since SWRCC is listed as the control point.

Once the system is is far enough along in testing, or operational, we should be able to see if it's being operated as a three site system, or as two separate ones.

mbstone99 · May 18, 2008

Russell said:
So should a third site be added for Duncanville with the five freqs listed under that license? Are these sites part of a networked system or are they three seperate and distinct systems? Seems like overkill to have 15 freqs with 3 control channels over a relatively small area. But, then again, I am not up to snuff on MPT-1327 systems.

Russell

I think that those 5 frequencies licensed will be part of the Duncanville site. I was getting a control channel last night on 453.4875 which is licensed to Duncanville. It seems the other sites are flipping the control channels around as well. I was getting Desoto 453.5125 (I have heard them previously on 453.3625 & 453.3875) and Cedar Hill on 460.1625 (I have heard them previously on 460.0375)

Matt

SCPD · May 22, 2008

Russell said:
So should a third site be added for Duncanville with the five freqs listed under that license? Are these sites part of a networked system or are they three seperate and distinct systems? Seems like overkill to have 15 freqs with 3 control channels over a relatively small area. But, then again, I am not up to snuff on MPT-1327 systems.

Russell

If you only knew ......

citylink_uk · May 25, 2008

I've been part of a team installing many of these MPT1327 systems (mainly by Fylde Micro - who link across to this very site) and they are very good and reliable if setup correctly.

The latest developments such as high speed data, repeater muting between overs, CTCSS overlay and various call setup alterations mean its a very feature rich protocol which is very affordable.

You definately can't just switch them on and go, and to get the best out of the system you have to fine tune all the perameters.

We use a free program called Trunkview, it's easy to install and is dedicated to monitoring/decoding MPT1327. Search for it on Google and feel free to PM me if you need help with it.

Russell · May 26, 2008

MaxTracker said:
If you only knew ......

Yeah, that's what I'm afraid of.

af5rn · Jun 7, 2008

As much as I am not looking forward to this change, I have to admit that anything would be better than what they have. It sounds like crap. It takes a full minute to tone out a fire because of the redundant tone system they are using. And the amount of noise on that system is horrendous.

hiegtx · Jun 7, 2008

af5rn said:
As much as I am not looking forward to this change, I have to admit that anything would be better than what they have. It sounds like crap. It takes a full minute to tone out a fire because of the redundant tone system they are using. And the amount of noise on that system is horrendous.

You're right. If they ever have a really big fire, it will have quite a head start before the dispatch system (at least the voice part), can ever get it toned out to the stations. Especially when they scattershoot companies between the three departments fairly often for responses.

ProVoice or What ?

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