Searching For New/Unknown NYCICN/ DOITT Talkgroups

Tank67 · Oct 6, 2020

Discovered 1102 on the P25, something about chief of staff and then said the name of the individual that I couldn’t make out. Not sure what this is, could be something revolving around the mayors office.

Edit: it’s calling different chief of staffs and just identified itself as an OEM channel. Also calling all the Car 1s. Think this is commissioner alert.

n2nov · Oct 6, 2020

Yes, it is the Commissioner ALERT channel call-up. Same as 17632 on the old 800 system.

pro106import · Oct 11, 2020

I'm hearing TG 10307 a lot today. Sounds like Parks special event of some type. On the P25 UHF system.

n2nov · Oct 11, 2020

pro106import said:
I'm hearing TG 10307 a lot today. Sounds like Parks special event of some type. On the P25 UHF system.

Good catch, Bob. I have been wondering why the gap on the P25 system after moving over the TGs from the UHF system. Now if we can figure out the other open spots.

283C	10300	T	DPR Rangers	Urban Park Service Rangers	Law Dispatch	Dept of Parks and Recreation
283D	10301	T	DPR Ops/Mnt	Operations/Maintenance	Public Works	Dept of Parks and Recreation
283E	10302	T	DPR Events	Special Events	Public Works	Dept of Parks and Recreation
283F	10303	T	DPR River	Hudson River Parks	Public Works	Dept of Parks and Recreation
2840	10304	T	DPR Exec	Executives	Public Works	Dept of Parks and Recreation
2841	10305	T			Public Works	Dept of Parks and Recreation
2842	10306	T			Public Works	Dept of Parks and Recreation
2843	10307	T	? special events?		Public Works	Dept of Parks and Recreation
2844	10308	T	DPR Bch Sec QN	Beach Security - QN	Security	Dept of Parks and Recreation
2845	10309	T	DPR Bch Sec BK	Beach Security - BK	Security	Dept of Parks and Recreation
2846	10310	T	DPR Bch Sec BX	Beach Security - BX	Security	Dept of Parks and Recreation
2847	10311	T	DPR Bch Sec SI	Beach Security - SI	Security	Dept of Parks and Recreation
2848	10312	T	DPR Lifeguard QN	Beach Lifeguards - QN	EMS-Tac	Dept of Parks and Recreation
2849	10313	T	DPR Lifeguard BK	Beach Lifeguards - BK	EMS-Tac	Dept of Parks and Recreation
284A	10314	T	DPR Lifeguard BX	Beach Lifeguards - BX	EMS-Tac	Dept of Parks and Recreation
284B	10315	T	DPR Lifeguard SI	Beach Lifeguards - SI	EMS-Tac	Dept of Parks and Recreation

pro106import · Oct 13, 2020

Further info on TG 10307. I just listened to quite a few recordings of this TG. A lot of talk about Field # this and field # that (Field 31 for instance), and different parks that seem to pertain to the Randalls Island Park facility. A lot of very casual QSO's.

pro106import · Oct 16, 2020

The best talkgroup yet. Started hearing it Wednesday. If you hear it, you will know right away what it is. On the 700 Simulcast only so far.
TG 12727
Bob
Milford, Ct.

pro106import · Oct 17, 2020

pro106import said:
The best talkgroup yet. Started hearing it Wednesday. If you hear it, you will know right away what it is. On the 700 Simulcast only so far.
TG 12727
Bob
Milford, Ct.

And it is also on the UHF P25 system now!

pro106import · Oct 27, 2020

OK new developments. Yes I am pretty far from the city but with my antenna setup and sensitive SDS100, I never had a moment in time where I was unable to hear the DOITT systems, either the UHF Motorola system, or the UHF and 700mhz. P25 systems. But, the past day or maybe more (I don't always have it in the scan lineup), the Analog DOITT UHF system has been quiet. I checked my recordings from the whole day, and nothing. However, another Control Channel is now also active on the system, at the same time the analog control channel is running. The control channel is 483.39375, which yes is dedicated as one of the CC's for the system. But it is in the P25 mode! The system ID is 3A8, which is the ID of the DOITT P25 system. Also, the site ID is 31. The NAC is 3A3. I heard some activity on it tonight. Radio Testing using the Radio Ops 4 Talkgroup.
But where did everything go from the Analog system? I'm getting the control channel at my normal -95 to -100db signal.

pro106import · Oct 28, 2020

The UHF analog system is back up and running. Same Control Channel 483.51875. I locked out the P25 control channel. I'm wondering if the radio was hitting that one first and using the P25 CC as the main one and that is the reason why I was not receiving anything. Once I locked it out, only the analog CC is being looked at now. Something to remember when you leave all 4 possible control channels scanning.

GTR8000 · Oct 28, 2020

There are currently two P25 UHF sites on the air, in addition to the SmartZone UHF site. It's unclear as to what the purpose of this new Site 31 is.

Control Channel	System ID	Site ID	NAC
483.24375	3A8 (P25)	30	3A2
483.39375	3A8 (P25)	31	3A3
483.51875	C820 (SZ)	1

pro106import · Oct 28, 2020

The UHF analog system is back up and running. Same Control Channel 483.51875. I locked out the P25 control channel. I'm wondering if the radio was hitting that one first and using the P25 CC as the main one and that is the reason why I was not receiving anything. Once I locked it out, only the analog CC is being looked at now. Something to remember when you leave all 4 possible control channels scanning.

GTR8000 said:
There are currently two P25 UHF sites on the air, in addition to the SmartZone UHF site. It's unclear as to what the purpose of this new Site 31 is.

Control Channel System ID Site ID NAC
483.24375 3A8 (P25) 30 3A2
483.39375 3A8 (P25) 31 3A3
483.51875 C820 (SZ) 1

Yes heard some testing on the site 31 last night. About the same signal strength as site 30 at my location.

GTR8000 · Oct 28, 2020

Now that I'm actually awake and thinking, this makes perfect sense. An ASTRO 25 system can have up to 30 repeaters per simulcast cell, however when you add Phase II TDMA into the mix as the DoITT 3A8 system is, you run into some practical limitations. Specifically, each simulcast cell is limited to 36 simultaneous voice transmissions, which equates to 18 repeaters/frequencies, plus one repeater that's operating as the control channel at any given point in time.

Since DoITT had around 24 frequencies that made up the UHF SmartZone cell, 12 of which are already made part of Site 30 of the P25 system, it makes sense to use the remaining 12 frequencies as part of the new Site 31. That would equate to 1 control + 22 traffic channels per site.

I wouldn't be surprised to see them segregate public safety on one cell and public works on the other cell.

Tank67 · Oct 31, 2020

12727 on the P25 is Coast Guard

pro106import · Oct 31, 2020

Tank67 said:
12727 on the P25 is Coast Guard

Yes channel 16 marine channel rebroadcast. 12729 is marine 22 when it is up. Only heard it for 2 days last week. Disappeared.

Tank67 · Oct 31, 2020

pro106import said:
Yes channel 16 marine channel rebroadcast. 12729 is marine 22 when it is up. Only heard it for 2 days last week. Disappeared.

Yup, I’ve heard it becoming more active recently however

pro106import · Oct 31, 2020

Tank67 said:
Yup, I’ve heard it becoming more active recently however

You heard the channel 22 12729 Talkgroup recently?

Tank67 · Nov 1, 2020

pro106import said:
You heard the channel 22 12729 Talkgroup recently?

What would I hear on channel 22? If it’s boarding vessels and stuff then yes

pro106import · Nov 1, 2020

Tank67 said:
What would I hear on channel 22? If it’s boarding vessels and stuff then yes

Yes Marine channel 22 (157.100) is active, but the talkgroup that repeated it on the DOITT P25 UHF system, 12729, has not been active since 10/28/2020. I first heard it on the 700 mhz. P25 system being tested on 10/16/2020 as you can see from my proscan loggings below.

,12729,857.987500,,-102,FM,10/16/20 10:19:14,00:00:00,1,NYC DOITT P25 - 700/800 SIMULCAST - Unknown - TGID:12729 ,,,10/16/20 10:19:14,NYC DOITT P25 - 700/800 SIMULCAST,P25 Trunk,PT0
,12729,769.956250,,-116,FM,10/16/20 10:21:25,00:00:07,2,NYC DOITT P25 - 700/800 SIMULCAST - Unknown - TGID:12729 ,,1178200,10/16/20 10:21:33,NYC DOITT P25 - 700/800 SIMULCAST,P25 Trunk,PT1

,12729,482.093750,,-115,FM,10/28/20 00:29:26,00:00:17,51,NYC DOITT P25 - UHF SIMULCAST - NEW - 12729 ,,,10/28/20 00:29:43,NYC DOITT P25 - UHF SIMULCAST,P25 Trunk,PT1
,12729,483.231250,,-106,FM,10/27/20 19:04:39,00:00:04,32,NYC DOITT P25 - UHF SIMULCAST - NEW - 12729 ,,,10/27/20 19:04:43,NYC DOITT P25 - UHF SIMULCAST,P25 Trunk,PT0

Tank67 · Nov 3, 2020

519 on P25 sounds like FDNY Operations, a Battalion was calling Marine 9 "on the 800 mhz"

pro106import · Nov 3, 2020

Tank67 said:
519 on P25 sounds like FDNY Operations, a Battalion was calling Marine 9 "on the 800 mhz"

Yes it is FDNY MARINE DIVISION 6B. Only on the 700mhz. P25 system so far.

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