PG County's P25 System

[m4a3t]

Question Regards Offset

I have question regards the offset of -(minus) 45Mhz on the base frequency of 851.00625. I'm unable to get that to "stick" when I add it to the trunking tables in Win 500. Is it needed when the scanner is set to P25 Auto? Also what does this negative offset do?

 

[baybum]

WIN500 file

Can somebody post their WIN500 file for PG P25?

 

[ka3jjz]

The stub article for this system in the wiki has been moved to conform to the database standards to:

Prince George's County (Project 25) - The RadioReference Wiki

73 Mike

 

[baybum]

No one has a file to share?

I don't know what or where to do the spacing and offset stuff, so a pre-made WIN500 file would greatly help me.

Thanks

 

[m4a3t]

Just set the Win500 to P25 Auto and it should set that information automatically. See this thread I found when looking for the same information.

http://forums.radioreference.com/gre-scanners/159624-p25-auto-manual-please-explain.html

Also it you don't hear anything immediately, be aware that I only hear broadcast sporadically.

 

[jkahn]

I haven't had time to play with my 996T, but on the 396T I set up 2 separate systems to see which works, I set one with the P25 system and on as Moto type II/ P25. I put in the CC for both sites, 101 and 102, and the three TGIDs 2001, 2003, and 2005.

In either system, when I sit on a control channel, I will get the system ID 02A8 and 0101 or 0102 sporadically, with 2 or 3 bars of signal. If I sit on a talk group, it bounces between the control channel freq and " searching for control channel", but I have yet to hear any voice on either system. I was not home during the Redskins game Sunday, which would have been the right time to try. If I do get anything, I'll post it here and tell you which system works better.
73's JK

 

[awal]

Listen this monday night!!!!

Reminder - the new system is used extensively at FedEX Field during Redskins games....no doubt you will hear them
(also the ESPN production crews are heard as well, when i get home i will post the freq. i heard them on last year)

 

[Dewey]

Sounds like the switchover is going... I have the feeling that they're simulcasting to the 490 system at this time because I'm hearing lot of "my portable is not working" and "I don't have a sqeulch", and other new to new radio type transmissions on PD. Anyone know if the new formats, TDMA and FDMA (I think) may be future firmware updates for the Uniden XTs????

Dewey

Edit: While monitoring the new P25 system with ProComm 96 attached to the Pro-96, I'm not seeing any activity. So now I'm wondering if what I am hearing is that they have the portables, but they haven't made the switch yet.

 

[WA3CSX]

what type of scanners are all you are using? handheld or base? uniden radio shack?

 

[ka3jjz]

There is only a small number of scanners that can trunk 700 mhz, and they're all listed here...

Prince George's County (Project 25) - The RadioReference Wiki

Some are able to use PRO-96 or 2096s with Pro96Com to view the system level information, but note that they cannot trunk on 700 mhz - the firmware doesn't allow for the table entries for that band.

73 Mike

 

[ka8ypy]

I was in a meeting last week, the official change over starts on December 7 with Police District 3 and the Sheriff's Department. After District 3 I believe the order is Dist. 2, 5, 4, 1. Also note that local municipalities in these districts will "probably" be included as well.

Currently the fire department only uses the system for special events (i.e. Redskins Games). No date yet for the full fire department change over.

Dan
KA8YPY

 

[dmi]

trying to program it in my PRO-106.. I pulled it from WIN500 of RRdb that should work right? I saw listed on the db page freqs that weren't in the scanner however I'm guessing it picks those off the control channels etc..?

I hit the control channel analyzer on the 106 and I get site 1 i think but no % meter.

I live near NIH..


Also, Montgomery County TRS is simulcasting PGFD dispatch lately on TG 5872(dec) 16f(hex) TAG: 8A PG 1

It seems kind of flaky.

jay

 

[ka8ypy]

trying to program it in my PRO-106.. I pulled it from WIN500 of RRdb that should work right? I saw listed on the db page freqs that weren't in the scanner however I'm guessing it picks those off the control channels etc..?

I hit the control channel analyzer on the 106 and I get site 1 i think but no % meter.

I live near NIH..


Also, Montgomery County TRS is simulcasting PGFD dispatch lately on TG 5872(dec) 16f(hex) TAG: 8A PG 1

It seems kind of flaky.

jay

The simulcast happens when there is a mutual aid call either MC to PG or vice versa.

Dan
KA8YPY

 

[Dewey]

I was in a meeting last week, the official change over starts on December 7 with Police District 3 and the Sheriff's Department. After District 3 I believe the order is Dist. 2, 5, 4, 1. Also note that local municipalities in these districts will "probably" be included as well.

Currently the fire department only uses the system for special events (i.e. Redskins Games). No date yet for the full fire department change over.

Dan
KA8YPY

Well, I don't think the anticipated change-over happened today (not surprising for major migrating radio systems). I dedicated the 996 to scanning Site 102 all day, but never heard anything, however, Unitrunker did show very rare, but occasional transmissions.

Dewey

 

[ka8ypy]

Well, I don't think the anticipated change-over happened today (not surprising for major migrating radio systems). I dedicated the 996 to scanning Site 102 all day, but never heard anything, however, Unitrunker did show very rare, but occasional transmissions.

Dewey

The change over officially did happen today, unofficially the set up the simulcast last Wednesday and played with the audio levels between the two systems on Thursday and Friday. As they install more radios (not all users have them yet) in district 3 and sheriffs department, you should hear more traffic.

 

[dmi]

First responders in Pr. George's get a $76 million radio upgrade (WashingtonPost.com)

Washington Post Metro section w/ Video
http://www.washingtonpost.com/wp-dyn/content/article/2009/12/07/AR2009120703155.html
-- -
First responders in Pr. George's get a $76 million radio upgrade

By Matt Zapotosky
Washington Post Staff Writer
Tuesday, December 8, 2009

Officials in Prince George's County unveiled a $76 million public safety communications system Monday that they say will eliminate radio dead spots in the county and make it easy for police and fire agencies from different jurisdictions to talk.

The upgrade, paid for with county tax dollars and $14.9 million in federal funds, includes 21 new radio towers and new radios for police officers, firefighters and emergency medical responders, officials said. It also creates a network for emergency responders to communicate, using the analog TV airwaves that were freed up when Congress mandated television's digital transition.

"This is big for Prince George's County," said Police Chief Roberto L. Hylton, one of several county officials who spoke at a news conference announcing the upgrade. "That means that one of my officers can travel anywhere in Prince George's County and have reliable communication back to headquarters."

Although the infrastructure is in place for the new system, it will not be completely rolled out until the end of 2010, officials said. That's when the county's new 911 center is expected to open and the fire department will join the new network. Meanwhile, officials said, police and emergency responders will be trained to use the new technology, which will be patched into the old system.

Vernon Herron, the county director of homeland security, said the upgrade ensures that the county is no longer "the hole in the doughnut" of the region's emergency communication system. Previously, he said, emergency responders in Prince George's could not communicate with those in Montgomery because the radio systems are different. Fixing that and radio dead spots, he said, is worth the $76 million cost.

"What price do you put on the lives of the men and women who keep our county safe?" Herron asked.

The new system also gives the county mapping technology to track the locations of emergency responders in their vehicles. Herron said it will be used to determine who is in the best position to respond to an emergency, not to keep tabs on employees.
-- -

 

[Dewey]

The change over officially did happen today, unofficially the set up the simulcast last Wednesday and played with the audio levels between the two systems on Thursday and Friday. As they install more radios (not all users have them yet) in district 3 and sheriffs department, you should hear more traffic.

Not to argue... seriously, but if they were simulcasting, I would think I should have seen more than 5 transmissions in over 5 hours. Sure, even the newest scanners may zoom right by unrecognized transmissions, but all of the data should be available to Unitrunker. Also, I would think that even if a single car was operating on the new system, I should see all of the dispatcher's transmissions since it would be going out over both.

Dewey

 

[gesucks]

If no radio (APX) is registered on the system and affiliated to a talkgroup, then nothing is put over the system.

This is not the old truning were everything is put out over the system all the time. Since you have to be registered and affiliated, it can control what goes out. If no one is on District 1 Disp talkgroup, nothing will be heard even if it is patched to the conventional channel and the conventional channel is active.

 

[troymail]

If no radio (APX) is registered on the system and affiliated to a talkgroup, then nothing is put over the system.

This is not the old truning were everything is put out over the system all the time. Since you have to be registered and affiliated, it can control what goes out. If no one is on District 1 Disp talkgroup, nothing will be heard even if it is patched to the conventional channel and the conventional channel is active.

So I'm finally getting around to play with this new system... I'm getting a control signal on 774.68125 on my PSR-500. Setting the Trunking Tables to AUTO I get no activity... I'm not entirely sure what to do with the base freq/offset, etc....

Has anyone else gotten anywhere with this?

 

[N_Jay]

If no radio (APX) is registered on the system and affiliated to a talkgroup, then nothing is put over the system.

This is not the old truning were everything is put out over the system all the time. Since you have to be registered and affiliated, it can control what goes out. If no one is on District 1 Disp talkgroup, nothing will be heard even if it is patched to the conventional channel and the conventional channel is active.

Patched talkgroups can be set to require a registered channel or be active all the time.

This is done for talkgroups that are commonly in scan lists.