Shelby County SO New Trunking System

[puzzleriddle]

Originally Posted by Avery93

One thing I forgot to mention: The system likely uses extended or "multi-block" Trunked Signalling Blocks (TSBKs). This enables specific input frequencies to be defined over the control channel, which is necessary because there is no standard offset for the input frequencies like there is on 7/800 MHz.

Unfortunately, GRE/Radio Shack scanners do not fully support the extended TSBKs, which results in them not being able to display information like the WACN, RFSS, Site ID and possibly System ID. They will still decode the messages and send them out through the CC dump, so you can use Pro96Com to get this information. They will also track group and private calls on the system normally. I believe Uniden scanners fully support the extended TSBKs, but I'm not sure.


Puzzleriddle, did you ever get Pro96Com running on the system? If you need any more help let me know. It would be great if you could let it run on each of the control channels for a couple of hours, and then post the log files. That info will tell us a lot about the system.

NO luck here.. haven't been able to get a cc yet could send ya my file that is made for the RS/GRE radios but I do think its because all I have are stock & portable antennas?. but I am up on the 5th floor here so I have no idea.

[medic9351301]

keep in mind with my exper. with vhf digital systems the power is down and not really good coverage from far away. perfect example is cullman county. when they switched over i lost them totally used to hear them super clean at my home all city pd's and the so. now its a strain to hear anything. another example is cullman ems (the ambulance service) l/c on analog pow there gone on digital. just keep that in mind.

from morgan: have heard that when switching from analog to digital the coordinators automatically reduce the output power because of interference issues.

[Avery93]

This is indeed a relatively low power system. According to the license, most locations are limited to <60 watts ERP, and one is even limited to 34 watts ERP. After reading through some of the applications and petitions, Shelby County seemed to have quite a problem getting frequencies licensed due to potential interference to incumbent licensees, so they are using as low power as possible while still providing acceptable coverage.

However, given that this thing was heard in Calhoun and Marion counties, I would expect that you could hear at least one of the sites from Birmingham. Try concentrating on 160.050 and 155.190, as those are the two control channels heard in the past. I haven't heard anything since I was able to monitor 160.050 for about 15 minutes the other day, but there hasn't really been any tropospheric ducting going on either.

For anyone wondering, the Harris P25 control channels sound like this. Quite different from the Motorola P25 CCs many of you around Talladega, Calhoun and Etowah counties may be familiar with.

[puzzleriddle]

nothing yet, been playing with a couple hours this Am... have noise on 154.415 but no traffic & no cc noise .. Is it possible to put the frequencies on pro96com manually?? so I can run it like Unitrunker??. also perhaps a Mod could sticky this thread?

[Thunderbolt]

Originally Posted by codeplug

P25 control channel on 155.1900.

Heard a P25 control channel on 155.1900 on Friday Dec. 28 at around 6:30 PM in Calhoun County North of Jacksonville.
Using a Pro-96 the screen readout only showed 96: and it was showing a flashing Dg off/on in the top right of the screen.
Either it was not broadcasting a System ID or I wasn't able to get one for some reason.
Signal was around 35-50 % on the control channel.

I believe they are also licensed for 155.1975 MHz. as well.

Ron

[puzzleriddle]

no luck yet Avery.. any suggestions?. I wish was a way to program in pro96.com like it it is in Unitrunker

[Avery93]

Originally Posted by puzzleriddle

no luck yet Avery.. any suggestions?. I wish was a way to program in pro96.com like it it is in Unitrunker

It sounds like you simply can't hear the system from your location. The only thing that may help that is a better antenna tuned to the VHF range, outdoors preferably. Since they may not have all five of the sites running yet, I would periodically scan all of the output/CC frequencies to see if a closer site has been activated.

As far as I know there is no way to manually enter an unknown system into Pro96Com (it's not pro96.com, by the way). It would be fairly pointless and would only make interpreting the data more difficult if you ever get to actually run it on the system.

[puzzleriddle]

I have all the freqs programmed in.. The best I could do with another antenna on the balcony outside.. but no good way to run the coax to the radio.. I have heard of people setting up a mag mount on a cooking sheet tho may just wait & see when the system gets fully installed if I can get a good signal on an cc then . Hmm does anyone have a uniden out there that may be having better luck than me so far??. may give me a good excuse to buy 1 lol

[medic9351301]

from the fcc website:
I still think that puzzle heard cullman city pd when he heard traffic on 155.190. i can hear it but it will not decode because i am so far away


1 KBF498 HARTFORD, CITY OF PW Expired 03/27/2005
2 KBY364 SLOCOMB, CITY OF 0007039381 PW Active 11/27/2015
3 KIA553 PIEDMONT, CITY OF 0001748029 PW Active 05/15/2021
4 KNHM541 ELBA, CITY OF PW Expired 04/08/2005
5 KQQ996 CULLMAN, CITY OF 0001749068 PW Active 08/06/2014
6 KTH413 MONROEVILLE, CITY OF 0001748243 PW Active 10/19/2014
7 WNLF958 FOLEY, CITY OF 0001748839 PW Active 05/12/2015
8 WNVG881 GENEVA, CITY OF 0001748722 PW Active 11/07/2014
9 WNWB666 ECLECTIC, CITY OF 0001745827 PW Expired 04/16/2001
10 WPJT684 GENEVA, COUNTY OF 0001747179 PW Active 01/15/2023
11 WPUJ588 ECLECTIC, CITY OF 0001745827 PW Active 03/18/2022
12 WPXF230 SHELBY, COUNTY OF 0001746783 YW Active 03/20/2013
13 WQDJ534 HARTFORD, CITY OF 0013771456 PW Active 09/12/2015
14 WQNC300 ELBA, CITY OF 0004242483 PW Active 12/10/2020
15 WQOT500 SHELBY, COUNTY OF 0001746783 YW Active 01/25/2022

[medic9351301]

i have a friend who is a et for the sheriffs office he is going to check with the it guy he said and see if its going to be in the clear or enc. with harris i am betting its going to be encryp. lets hope not