Northumberland co-new pging system?

[sdruser]

output from sdr trunk 11:15 1/26/17, maybe this will help?

Decoder P25
===================== THIS SITE===================

NAC 681
WACN-SYS BEE00-685[0UXAA?]
LRA 00
RFSS-SITE 01-01
SERVICES CONTROLCHAN[]SERVICES[REGISTRATION VOICE]
PCCH: DNLINK 161.800000[4-2064]
UPLINK 157.200000[4-2064]

SCCH: DNLINK 161.837500[4-2067]
UPLINK 157.237500[4-2067]

SCCH: DNLINK 161.875000[4-2070]
UPLINK 157.275000[4-2070]
SCCH: DNLINK 161.875000[4-2070]
UPLINK 157.275000[4-2070]

SCCH: DNLINK 161.912500[4-2073]
UPLINK 157.312500[4-2073]
SCCH: DNLINK 161.912500[4-2073]
UPLINK 157.312500[4-2073]

SCCH: DNLINK 161.837500[4-2067]
UPLINK 157.237500[4-2067]
SCCH: DNLINK 161.837500[4-2067]
UPLINK 157.237500[4-2067]

SCCH: DNLINK 161.875000[4-2070]
UPLINK 157.275000[4-2070]

FREQUENCY BANDS:
0-BASE 851.006250 CHANNEL SIZE 0.006250 UPLINK OFFSET: -45.000000
1-BASE 762.006250 CHANNEL SIZE 0.006250 UPLINK OFFSET: 30.000000
4-BASE 136.000000 CHANNEL SIZE 0.012500 UPLINK OFFSET: -4.600000

this is only from the control channel 161.800. aslo when i tune hdsdr to 161.800 and virtual audio cable it to dsd+ i get "Sync: +P25p1 NAC:681 TDSU" is it possible that they can run some hybrid p1 + p2 system? i'm still kinda new at this apco stuff but am working on a dual core kubuntu/op25 system to feed out online, just have to do alot more reading on getting op25 running in gnu radio. hope this helps some. the signal is up, just have only caught bits and pieces of audio and they were very garbled. weird though as i'm only 5 blocks from the shamokin pd station....?

 

[Jim_Shaffer]

the signal is up, just have only caught bits and pieces of audio and they were very garbled. weird though as i'm only 5 blocks from the shamokin pd station....?

If you look back to message #26, you'll see that the few transmissions I've heard are also very garbled. I have line of sight to one of the towers in a quite different part of the county; I'm not sure how far away it is but when the sun hits it right I can see the antennas with the naked eye.

 

[Dispatcher308]

As others have stated it is a Linear Simulcast Modulation, see Wiki link below

Simulcast digital distortion - The RadioReference Wiki

 

[Jim_Shaffer]

Getting lots of NON-garbled tests today, on a talk frequency of 161.95.

 

[phillydjdan]

I was up that way on the 22nd and was running Unitrunker. The above info is correct. One thing to note is that it appears they may have this system setup similar to how Philadelphia has thier system setup. The system is Phase II CAPABLE but not in use. It appeared to me that the talkgroups were standard P25 and not P25 Phase II while I was monitoring. So what that means to you is a Phase II scanner may not be neccessary. Any P25 digital scanner will likely work. As for LSM distortion that is likely what you were hearing. Many systems in the Philadelphia area suffer that same issue. The only real solution is to use an actual radio instead of a scanner.

On a side note I will add that while it was a valient effort to keep this information secret, the truth is the information was transmitted by the system the moment it was turned on. Not much you can do to keep that under wraps, just sayin...

 

[BigLebowski]

I was up that way on the 22nd and was running Unitrunker. The above info is correct. One thing to note is that it appears they may have this system setup similar to how Philadelphia has thier system setup. The system is Phase II CAPABLE but not in use. It appeared to me that the talkgroups were standard P25 and not P25 Phase II while I was monitoring. So what that means to you is a Phase II scanner may not be neccessary. Any P25 digital scanner will likely work. As for LSM distortion that is likely what you were hearing. Many systems in the Philadelphia area suffer that same issue. The only real solution is to use an actual radio instead of a scanner.

With so few voice frequencies you would think it would have to be a Phase II capable system. Not that there is THAT much traffic in NC on a daily basis from my observations but depending on the number of users and conditions outside their control... Like a significant storm.. Doesn't seem like enough voice channels to support Phase I operation only.

Also FWIW some Phase II systems will automatically drop back to Phase I on a talkgroup if a radio only capable of Phase I affiliates.

 

[phillydjdan]

I believe the control channel can also be a voice channel if I remember correctly. They could also theoretically apply for more frequencies to add later or even reprogram the system to make it phase 2 on the fly. If they have OTAR on the system they can redo the radios right over the air. No need to bring it back for programming.

 

[sdruser]

anyone able to lock this system with dsd or sdrtrunk today? i haven't been able to since around 7am this morning... i've heard that this system has crashed significantly on 2 separate occasions. another crash or waiting for parts maybe??

 

[sdruser]

update...can lock system again as of 1:45pm....

 

[SlipNutz15]

phillydjdan - most systems have multiple channels able to be a control channel so the base radio does not burn out transmitting 24/7/365. With that said, it will take some monitoring, getting ahold of a radio on the system, or talking to the director to find out what channels are backup control channels.

The nice thing about a TRS is the frequencies are recycled by the master controller rather quick (usually within 3 seconds of dekey) so when you look at the system, they have 6 frequencies, 1 is a control channel, leaving 5 voice channels to be in use SIMULTANEOUSLY. I'm from Juniata County, so I don't hear Norry much, but at any one time are there 5 different channels talking at the EXACT same time? Probably not.

 

[lobo8000]

Any word on when they're going to give this another go?

 

[WB3N]

Delayed Launch

Excerpts below from a recent article in the local Newspaper dated Feb 9 +/-

"Antenna delays switch to digital 911 system"

"SUNBURY — The digital narrow band 911 communication system in Northumberland County has been delayed for a third time to fix an antenna at one of the tower sites that was the cause of some of the issues plaguing the launch."

"A new launch date has not been set, but the county should have a better idea today on when the system will go live, according to Northumberland County Commissioner Rick Shoch, the county leader in charge of public safety departments."

...The defective antenna “was a reason for one of the issues, but not all,” Shoch said. “Some of the other issues were technical issues surrounding the programming of the responders’ radios.”

 

[pete7919]

The system is live and working flawless at this time. The new analog dispatch channel will be patched over to the TRS "NC PRIMARY" talkgroup. The new radio system is still online for cutover for mid January 2017.

Latest update is that one of the towers was not installed correctly and needs to be fixed. Once that is fixed the system will need to be remapped.

They're looking at May/June to cutover.

The good news is that Knoebels opens in 52 days.

 

[WB3N]

Northumberland County System

Observed testing traffic (sequential tones + voice test count) on the "Paging" frequency today.

 

[nc4954]

OK everyone! The time has finally come once again. The new Northumberland 911 Communications P25 Phase I Digital TRS is again up and running with no issues. The antenna issue has been 100% fixed and the system crashes issue has also been 100% fixed.

The new dispatch channel sounds 100% better sine the antenna issue has been corrected.

The official cutover date is May 30 and 31, 2017.

The police will cut over on one day and all fire on the second day as a controlled rollout throughout the day.

Also for those of you that did not know, Knobeles Amusement Park in Elysburg, PA has switched over to a 100% VHF digital MotoTrbo Radio system this year. They purchased all new radios and accessories and repeaters. They do also have a VHF P25 Digital TRS base radio installed so County Public Safety can access the parks comm center on P25 and then be patched into a parks specific talk group like EMS or Security.

Thanks!

 

[W7FDX]

Anyone know what the AOAA TG is going to be used for?

 

[nc4954]

Yes, the AOAA is the County Anthracite Off Road Adventure Area in Burnside. It will be their daily operations talk group.

Sent from my SM-N920C using Tapatalk

 

[W7FDX]

Any clue what the TGIDs for the police are? All that is listed is police primary (10001). Just trying to complete mapping the system. I am very excited to see how this system works once it goes completely live...

 

[nc4954]

No I do not. Keystone Communications holds all the system keys and codeplug info. I guess you will have to wait until next week to get that info off a trunk tracker scanner.

Sent from my SM-N920C using Tapatalk

 

[W7FDX]

Sounds good thanks!