HP-1: Home Patrol 1 P25 Phase 2

[Don57]

Recently my home patrol 1 stopped receiving the Suffolk County NY police dept on their Motorola system . I know they recently fully switched from their Motorola system to their P25 Phase 2 system. I knew the day was coming so I purchased an SDS100 last October. The thing is , the other day I updated the HP1 firmware and database with Sentinel , which I haven’t done in at least 10 years. Now I am receiving the SCPD again. How is this possible since the HP1 does not receive Phase 2 and the SCPD is now only using the Phase 2. Forgive me if this is a dumb question.

 

[tvengr]

Now I am receiving the SCPD again. How is this possible since the HP1 does not receive Phase 2 and the SCPD is now only using the Phase 2.

You will be able to receive any talkgroup with a D is the Mode column. Those talkgroups are still Phase 1 even through the system is Phase 2 capable. You will not be able to receive any talkgroup with a T in the Mode column. Those talkgroups are Phase 2.

DEC	HEX	Mode	Alpha Tag	Description	Tag
3111	c27	D	SCPD 1st Pct	1st Precinct Dispatch	Law Dispatch
3211	c8b	D	SCPD 2nd Pct	2nd Precinct Dispatch	Law Dispatch
3311	cef	D	SCPD 3rd Pct	3rd Precinct Dispatch	Law Dispatch
3411	d53	D	SCPD 4th Pct	4th Precinct Dispatch	Law Dispatch
3511	db7	D	SCPD 5th Pct	5th Precinct Dispatch	Law Dispatch
3611	e1b	D	SCPD 6th Pct	6th Precinct Dispatch	Law Dispatch
3711	e7f	D	SCPD 7th Pct	7th Precinct Dispatch	Law Dispatch

​

Fire West

Divisions 1, 2, 3​

Huntington 1 and 2 are on the 800 Cell
Huntington 3, 4, and 5 are on the 700 Cell

DEC	HEX	Mode	Alpha Tag	Description	Tag
10001	2711	T	FD Babylon 1	Babylon 1	Fire-Tac
10003	2713	T	FD Babylon 2	Babylon 2	Fire-Tac
10005	2715	T	FD Babylon 3	Babylon 3	Fire-Tac
10007	2717	T	FD Babylon 4	Babylon 4	Fire-Tac

 

[Don57]

Thanks , I am receiving a T mode , the Town of Babylon Public Safety Dept. , I’ve been listening to them since I updated it the other day.

 

[tvengr]

If you are receiving those talkgroups, they are Phase 1. Depending how the system is programmed, a Phase 2 talkgroup may revert to Phase 1 if a Phase 1 radio affiliates with the talkgroup. The database shows a talkgroup to be Phase 2 if a Phase 2 transmission has been observed.

 

[enosjones]

It is possible that the control channel is phase 1, even though the system is phase 2. Mine is doing the same thing for the system here in Utah. They alternate between phase 1 and 2. Especially if the talkgroups are patched with either vhf or some other way it will go phase 1.

 

[MTS2000des]

Most likely a DDM (dual dynamic mode) talkgroup(s). When an FDMA radio affiliates with a given TG, the talkgroup is downgraded to FDMA. When the legacy subscriber deaffiliates or after a certain time (default is 12 hours), the TG reverts to TDMA.