Johnson County Iowa P25 system info

[splash1]

More tg ids
tg-52401 is Johnson co fire remote site
tg-52055 is IC Fire tac
tg-52007 unknown parks /camping

rick

[splash1]

More updates

tg-52023 is IC PD TAC-2
tg-52050 is Johnson co ambulance. Both this tg and 52403 are JC AMB, not sure yet if one is page out and one response or what .

On tg-52007 parks did hear traffic from Sugar Bottom and Sandy beach area.
Should be lots of traffic on the new system today with the Iowa/ Iowa state game, if someone has time to help id more of the talk groups.
Rick

[iowaboy46]

52062
52050 Sounds like fire/ems


Not being from IC, what is FPA as opposed to ICFD?

[Bandit52240]

52062 is agency. also known as the old tac 4 but called agency now.

FPA is fire police ambulance so they can communicate with each other

[Bandit52240]

52023 Iowa City Tac 2

[Bandit52240]

52402?

[iowaboy46]

as those too distant to be decoded properly. can tgs only be sent thru certain towers limiting their range?

guess i am used to the CR TRS where all tgs are even in strength and clarity

[divemedicdrb]

Hey Guys

Does anyone have a complete list of all the Identified TGID's so far?

How do we submit to the database and get them confirmed so theyre listed in the Database?

Thanks for the info everyone.

PS: UI EMS has started streaming the live Johnson County feed now. It's focussed on FIRE/EMS and UI DPS only.

It's streaming only the old analog system right now, but we can go to the digital one as soon as we confirm the needed TGID's for:
IC Fire Disp
FPA 1-4
Fire Tac
County Fire
County Fire Remote
JCAS
DPS Ops
DPS Info
DPS Tac
UI Fireground

Then we'll switch it to the digital system.

Feedback and suggestions for improvements on the feed are welcome.

[timkilbride]

Originally Posted by divemedicdrb

Hey Guys

Does anyone have a complete list of all the Identified TGID's so far?

How do we submit to the database and get them confirmed so theyre listed in the Database?

Thanks for the info everyone.

PS: UI EMS has started streaming the live Johnson County feed now. It's focussed on FIRE/EMS and UI DPS only.

It's streaming only the old analog system right now, but we can go to the digital one as soon as we confirm the needed TGID's for:
IC Fire Disp
FPA 1-4
Fire Tac
County Fire
County Fire Remote
JCAS
DPS Ops
DPS Info
DPS Tac
UI Fireground

Then we'll switch it to the digital system.

Feedback and suggestions for improvements on the feed are welcome.

Here is for submitting info related to the system:

Submit Data to RadioReference

Then select the drop down menu's to navigate to JCOMM.


The only list of known TGs is in the database.

Tim K.

[divemedicdrb]

Ok, outstanding. So everything on the DB right now is all we've discovered so far?

I'm working on trying to get a list of all the TGID's from someone in JCOMM, we'll see how that goes.

[timkilbride]

Originally Posted by divemedicdrb

Ok, outstanding. So everything on the DB right now is all we've discovered so far?

I'm working on trying to get a list of all the TGID's from someone in JCOMM, we'll see how that goes.

What is in the DB is what has been identified so far.

Unitrunker is telling me there are 39 groups and 30 users using the system at the time of my posting.

Tim K.

[divemedicdrb]

Hey Guys

So we're using the BCD996XT to scan the JCOMM digital system. Audio coming across seems to be very choppy. Does anyone have suggestions for what needs to be tweaked?

The analog system is coming across clear as day.
Digital is garbled with chops in the voice at times.

[splash1]

Originally Posted by divemedicdrb

Hey Guys

So we're using the BCD996XT to scan the JCOMM digital system. Audio coming across seems to be very choppy. Does anyone have suggestions for what needs to be tweaked?

The analog system is coming across clear as day.
Digital is garbled with chops in the voice at times.

J-COMM is still in the build stage and only operational as they move forward with the system. I may be wrong, but don't think most have even received there radios as yet. some of the tg are still garbled and it may be several weeks yet before it will be fully operational if then.

Rick

[timkilbride]

My 996t is getting a Ø decode on the system now. I'm located on the SW side of Cedar Rapids. I am still having a problem with the scanner just resuming before the carrier is dropped. I doubled checked my delay, still set at 4 seconds.

Tim K.

[Bandit52240]

I personally feel why it is so choppy is because of the patch from the old system to the new system.

[Radioman96p71]

I have heard of this problem with other P25 simulcast systems. It seems some scanners aren't quite sure how to handle the signal. A way to get around it is to use a directional antenna and point it at one of the closest tower sites, and even use the side lobes to try to cancel out other sites. I saw a nice writeup on that somewhere ill have to dig for it.

[timkilbride]

Originally Posted by Radioman96p71

I have heard of this problem with other P25 simulcast systems. It seems some scanners aren't quite sure how to handle the signal. A way to get around it is to use a directional antenna and point it at one of the closest tower sites, and even use the side lobes to try to cancel out other sites. I saw a nice writeup on that somewhere ill have to dig for it.

When I lived in Bellevue, NE, I had the same problem with the ORION system to the North of me. I did post a link earlier in this thread about it. The radio system is designed to work IN Johnson County. When I would travel to Omaha, the scanner did pretty well. A Bellevue, NE PD officer even chimed in and commented the ORION system broke up on his radio too! So if your outside of Johnson County, expect problems.

Tim K.

[Bandit52240]

well i live in iowa city and its choppy and stuff but i still think it has to do with the patch setup

[newsphotog]

Originally Posted by Bandit52240

well i live in iowa city and its choppy and stuff but i still think it has to do with the patch setup

I'm guessing that you're thinking that the 800 MHz network is "listening" over RF to the old VHF/UHF analog frequencies, and that's what's producing the choppiness... it's more likely that it's the P25 simulcast issue. I agree with Tim and Adam that what you are experiencing is simply your scanner's difficulty in decoding simulcast P25. It's a very well-documented issue with most consumer-grade scanners on various P25 simulcast systems.

The "patch" you are talking about very likely is not simply the 800 MHz network "listening" over RF to the old VHF/UHF analog frequencies, but since all Johnson County agencies are being dispatched by JCOMM, it's much much more likely that the audio you are hearing on BOTH the legacy analog VHF/UHF systems AND the 800 MHz system are coming straight from the consoles and servers -- no RF listening needed, no remote RF patches needed, not to mention that could be an additional, unnecessary point of failure in the interim.

Even if it was listening over RF for the patch, I don't think they would put the receiver in the dead zone which could create the choppiness. If mobile units and portables are coming in "choppy" but dispatch is coming in crystal clear, then your patch-side choppiness theory may have warrant. But since all stations are coming in with the same choppiness/R2D2, it's likely that it's the simulcast decoding issue.

[timkilbride]

I just went through my audio recordings from ProScan(Great program BTW). I updated some TG's. Even found AREA 11 being used on the system!

Now if I could just get my scanner to stop randomly resuming scan on the system, I would be set.

Tim K.