Bailey1213
Member
For what its worth I was listening to Douglas County Fire Department today and noticed that they were using P25 Phase 2. It caught my attention because it came in much louder than all the other systems.
Douglas County P25 Phase 2
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Their Mototrbo is being simulcast to the P25 system. That has been going on since October 15. They have been doing some testing off and on with the new system. Progress is being made, but the Sheriff and Fire still have yet to receive and install the new radios and antennas.
SO and FD is still on the Mototrbo system as of now, correct?
Sure are a lot of good Mototrbo systems being installed and then decommissioned after a short while. Well within their life span. Where do all these radios and repeaters and consoles and such go?
Sure are a lot of good Mototrbo systems being installed and then decommissioned after a short while. Well within their life span. Where do all these radios and repeaters and consoles and such go?
Bailey1213
Member
The fire department has been on both systems for a while. Up until recently when I heard them on the P25 system it was phase 1. I noticed yesterday it came in phase 2
And just like that both Douglas County Fire and the Sheriff switched over to their new P25 P2 system this morning. Fire is in the clear however I need someone else to confirm that the Sheriff is encrypted. With the 325P2 encryption is silent. I am seeing TG 31311 and 31315 showing up on the display but nothing is heard which is typical for encrypted channels. grrrrrr 
Maybe some of the more experienced folks can research to see if they are using additional frequencies than what is published.
Your help is appreciated.
Maybe some of the more experienced folks can research to see if they are using additional frequencies than what is published.
Your help is appreciated.
Bailey1213
Member
Looks as if your suspensions are correct. My Whistler gives me a busy tone (encrypted) and the SDS100 and SDS200 show encrypted when data is transmitted. Another Georgia agency has gone silent.....
MTS2000des
5B2_BEE00 Czar
law is all AES-256
Bailey1213
Member
As of fight now City of Douglasville PD can still be heard
MTS2000des
5B2_BEE00 Czar
Douglasville is not part of the project.
All primarily on the same simulcast site though right? From an infrastructure perspective, was the Douglas County project an expansion to add additional sites to what was formerly thought of as the Douglasville site? In other words, there are not separate Douglasville and Douglas County sites now are there?
Bailey1213
Member
Hmmmm. Well...as of right now Douglasville PD dispatcher can be heard but the responding units are encrypted...
Bailey1213
Member
I didnt see the talkgroup ID for Douglas County Fire TAC channel, anyone discover that one? I have the wild card programmed and assume it will start with 31***.
MTS2000des
5B2_BEE00 Czar
Correct.
Douglasville PD is dispatched separately, call comes into 911 (county), transferred to DPD.
The radio project was county funded.
DPD has been a part of the CRRS since the late 1990s and part of the 2006 P-25 migration. So in essence, the only "new" users are the county, with sites added to augment coverage as needed.
DPD already has APX, so nothing new procured. The decision to go coded may have happened. I am not aware of that being part of the project.
Thanks! Are the Douglasville FCC licenses an accurate representation of the sites in use now, or are some of those licensed sites aspirational?
Also, does anyone know what the two 800 MHz frequencies licensed directly to Douglas County (with multiple similcast site licenses) are used for?
I assume you are talking about the 854.2875 and the 855.8375 freq? I have had these in the scanner for the last couple of days. The 854.2875 identifies itself every 30 minutes as if it's a repeater and no other traffic on it. Maybe it's a backup?
The 855.8375 seems to always be transmitting. Could it be a control channel or something of the sort?
Douglasville Police seem to be using a different type of encryption. My Uniden doesn't silence it, which creates an annoyance. How much of a problem does that create when one encrypted agency wants to communicate with another encrypted agency?
The 855.8375 seems to always be transmitting. Could it be a control channel or something of the sort?
Douglasville Police seem to be using a different type of encryption. My Uniden doesn't silence it, which creates an annoyance. How much of a problem does that create when one encrypted agency wants to communicate with another encrypted agency?
MTS2000des
5B2_BEE00 Czar
It isn't. Their APX radios, like the ones I care for, are equipped with multiple algorithm encryption. Other vendors such as Kenwood also support multi-algorithms in a single radio. I have VP6430s on our system with AES-256, ARC4 (aka ADP), and DES-OFB.
Why?
MTS2000des
5B2_BEE00 Czar
that is what the RFP called for: AES encrypted subscribers. If one is going to go encrypted, AES-256 is the Federally approved standard.
Bailey1213
Member
Why? you ask....well of course offer safety
Bailey1213
Member
Ok.... well the city of Douglasville PD as I have stated before, the units are coming in encrypted but dispatch is not but the funny thing I noticed today id the word "patch" flashing next to the TGRP on the Whistler screen when dispatch transmits?
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