PA Statewide P25 Phase 2 System

[u2brent]

I'm picking up something odd on 153.60625, anybody in S Ches Co picking anything up there. could be a ghost? but never was before tonight....

 

[HM1529]

It would appear that K3 Skippack (Montgomery) 10165 is dispatching... Console ID's 107, 108, 109

I have been seeing the following in my logs:

103 on 10164
104 no hits
105 no hits
106 on 10164
107 on 10165
108 on 10165
109 on 10163
110 on 10163
111 on 10163

 

[magiclightman]

I'm picking up something odd on 153.60625, anybody in S Ches Co picking anything up there. could be a ghost? but never was before tonight....

I’m getting something on 153.613, the difference is most likely my uncalibrated SDR dongle


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[u2brent]

I have been seeing the following in my logs:

103 on 10164
106 on 10164
107 on 10165
108 on 10165
109 on 10163
110 on 10163
111 on 10163

103 PSP K2 Media Disp1? TG 6/10164
104 PSP ?? Disp? ? TG? NC
105 PSP ?? Disp? ? TG? NC
106 PSP K2 Media Disp4? TG 10132/10164
107 PSP K3 Skippack Disp1 TG 10165
108 PSP K3 Skippack Disp2 TG 10165
109 PSP K1 Philadelphia Disp1 TG 10163/10165
110 PSP K1 Philadelphia Disp2 TG 10163
111 PSP K1 Philadelphia Disp3 TG 10163
..

 

[u2brent]

I’m getting something on 153.613, the difference is most likely my uncalibrated SDR dongle


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Whatever it was.. Now it's disappeared. Said P25 NAC 943 but no site id, weird..
And definitely stronger than Truce's CC.

"I always feel like somebody's watching me"

Like it was parked near my house..

2019/04/15 20:34:23 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.76; CC=0-1381
2019/04/15 20:34:24 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.69; CC=0-1217
2019/04/15 20:34:24 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.57; CC=0-1253
2019/04/15 20:35:14 Freq=153.606250 NAC=943 Resetting neighbor list
2019/04/15 20:35:15 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.69; CC=0-1217
2019/04/15 20:35:15 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.76; CC=0-1381
2019/04/15 20:35:15 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.57; CC=0-1253

Then gone..

 

[magiclightman]

Whatever it was.. Now it's disappeared. Said P25 NAC 943 but no site id, weird..
And definitely stronger than Truce's CC.

"I always feel like somebody's watching me"

Like it was parked near my house..

2019/04/15 20:34:23 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.76; CC=0-1381
2019/04/15 20:34:24 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.69; CC=0-1217
2019/04/15 20:34:24 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.57; CC=0-1253
2019/04/15 20:35:14 Freq=153.606250 NAC=943 Resetting neighbor list
2019/04/15 20:35:15 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.69; CC=0-1217
2019/04/15 20:35:15 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.76; CC=0-1381
2019/04/15 20:35:15 Freq=153.606250 NAC=943 Neighbor: Site 0942-1.57; CC=0-1253

Then gone..

153.605 is Kennett school district, but I doubt they’re a p25 system. Wierd!


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[u2brent]

153.605 is Kennett school district, but I doubt they’re a p25 system. Wierd!


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I must have been getting 153.6125 Truce's voice freq..

 

[GTR8000]

I must have been getting 153.6125 Truce's voice freq..

I would say so, judging by the fact that the NAC and entire adjacent site list both match Truce exactly.

 

[magiclightman]

I would say so, judging by the fact that the NAC and entire adjacent site list both match Truce exactly.

Are they using Vehicle Repeaters for this system at all? Maybe there was one driving past his house?


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[u2brent]

I would say so, judging by the fact that the NAC and entire adjacent site list both match Truce exactly.

wouldn't think a voice ch would have adj site info, but not it's own, interesting.

 

[EMT1301]

Are they using Vehicle Repeaters for this system at all? Maybe there was one driving past his house?


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Yes, PSP are using vehicular repeaters by default on their portable radios.

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[magiclightman]

Yes, PSP are using vehicular repeaters by default on their portable radios.

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Thats what I thought,

Possibly just a patrol car driving past or close?


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[u2brent]

wouldn't think a voice ch would have adj site info, but not it's own, interesting.

It must be some data trans. it's going on even when there's no voice traffic..

 

[GTR8000]

wouldn't think a voice ch would have adj site info, but not it's own, interesting.

That's exactly what the voice channels broadcast; their NAC as well as the adjacent site(s) control channels. The radios already know which site they were monitoring if they're tuned to the voice channel, so there's no need to broadcast that info. The adjacent site info is broadcast on the voice channel so that the radio can switch to one of those sites quickly if necessary (i.e. the voice transmission drops out and the radio can no longer find the site's control channel). There is other data broadcast on the voice channels that most software won't decode, such as other active talkgroups at the site. This is done for priority scanning purposes, as the radio would otherwise have no way to know if a talkgroup set for priority becomes active while it's monitoring a transmission on the voice channel.

Most likely it's data being carried on 153.6125, not voice, otherwise you'd probably see a TGID also.

 

[GTR8000]

Are they using Vehicle Repeaters for this system at all? Maybe there was one driving past his house?

Thats what I thought,

Possibly just a patrol car driving past or close?

That's not how the vehicular repeaters work. At no time do they rebroadcast the site's voice channel(s).

They work as follows: The vehicular repeater is interfaced with the mobile radio. The user keys the portable which then transmits on another band (700 or 800, whatever they're using), that signal is received by the vehicular repeater, which then causes the mobile radio to key up on the voice channel input. That's how the signal gets from the portable into the trunked system. When a transmission is received by the mobile radio, it activates the vehicular repeater which in turn transmits that signal back out on the same 700 or 800 frequency the portable was transmitting on previously.

 

[u2brent]

That's not how the vehicular repeaters work. At no time do they rebroadcast the site's voice channel(s).

They work as follows: The vehicular repeater is interfaced with the mobile radio. The user keys the portable which then transmits on another band (700 or 800, whatever they're using), that signal is received by the vehicular repeater, which then causes the mobile radio to key up on the voice channel input. That's how the signal gets from the portable into the trunked system. When a transmission is received by the mobile radio, it activates the vehicular repeater which in turn transmits that signal back out on the same 700 or 800 frequency the portable was transmitting on previously.

Wonder if they're encrypted? If you happened upon one..

 

[EMT1301]

Wonder if they're encrypted? If you happened upon one..

The encryption is handled by the portable. The repeater doesn't "know" what data it's rebroadcasting, it just passes it straight through to the mobile radio.

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[BM82557]

Site 1.55 was an isolated neighbor to site 1.50 when I checked yesterday -

2019/04/15 18:02:12 Freq=159.187500 NAC=94D Current network: BEE00.942 PA STARNet P25
2019/04/15 18:02:13 Freq=159.187500 NAC=94D Current site: BEE00.942-1.50 South Mountain FRAN02 Franklin County
2019/04/15 18:02:14 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.58; CC=4-2178 155.4450 Andersontown YORK16 York County
2019/04/15 18:02:14 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.49; CC=4-554 151.3850 Upper Strasburg FRAN01 Franklin County
2019/04/15 18:02:16 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.55; CC=0-1389 859.6875 ISOLATED
2019/04/15 18:02:18 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.48; CC=4-491 151.2275 Wells Tannery FULT01 Fulton County
2019/04/15 18:02:19 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.95; CC=5-3995 171.6875 Big Flat CUMB04 Adams County

Tonight site 1.55 does not show as isolated -

2019/04/16 21:24:19 Freq=159.187500 NAC=94D Current network: BEE00.942 PA STARNet P25
2019/04/16 21:24:20 Freq=159.187500 NAC=94D Current site: BEE00.942-1.50 South Mountain FRAN02 Franklin County
2019/04/16 21:24:21 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.49; CC=4-554 151.3850 Upper Strasburg FRAN01 Franklin County
2019/04/16 21:24:22 Freq=159.187500 NAC=94D Registration; RID=1204314 ACCEPT
2019/04/16 21:24:22 Freq=159.187500 NAC=94D Affiliation; RID=1204314 TG=10153 [PSP H3 Chambersburg (Franklin) FRAN02/LANC33/YORK16] ACCEPT
2019/04/16 21:24:23 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.58; CC=4-2178 155.4450 Andersontown YORK16 York County
2019/04/16 21:24:24 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.48; CC=4-491 151.2275 Wells Tannery FULT01 Fulton County
2019/04/16 21:24:25 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.95; CC=5-3995 171.6875 Big Flat CUMB04 Adams County
2019/04/16 21:24:25 Freq=159.187500 NAC=94D BEE00.942-1.50 neighbor: Site BEE00.942-1.55; CC=0-1389 859.6875
2019/04/16 21:24:51 Freq=159.187500 NAC=94D Registration; RID=1204292 ACCEPT

 

[rrbum]

Weird stuff. Whatever these data transmissions are they are on every site that I am able to receive. Mostly on the "voice" frequencies. The Philadelphia site is a steady stream on all three active channels (154.755, 155.505, 155.670) effectively knocking it off the air as per it's neighbors.
Maybe this system will be mainly a computer based dispatch/respond type deal with voice channels as a lesser used option.

Burn-in/stress test ? Opensky patch ? Catastrophic failure ?

Wonder what they're up to ?????

 

[GTR8000]

The system does not have data capabilities. If the voice channels are "busy", but you don't see any indication of voice calls (clear or secure), then most likely they're transmitting a test pattern. If you tune to the frequencies with a scanner, you should hear the digital "noise".

Let's also keep in mind that this system is still very much in the build-out stages, and so there's nothing unusual about sites going in and out of WIDE mode frequently as they configure and tweak various pieces and parts of the infrastructure, including the microwave network.