They are not ripping the repeaters out so I’d say backup is a good selection for the DB.
New Jersey Interoperability Communication System (NJICS)
- Status
Analogrules
Active Member
- Joined
- Jan 15, 2007
- Messages
- 1,948
Currently the DB on top says that Cranford FD and EMS VHF/UHF conventional channels will be used for local back up, however 476.900 is still listed as the "Fire Dispatch" frequency. These statements contradict each other. Is FD dispatch still simulcasted on 476.900 or should 476.900 be marked as (local backup) fire tac?
Analogrules
Active Member
- Joined
- Jan 15, 2007
- Messages
- 1,948
Ok, I was able to answer my own question. I am still hearing Cranford FD dispatch on 476.900, therefore the UHF frequency is currently NOT just used for back up.
- Joined
- Dec 22, 2005
- Messages
- 1,915
I can confirm this. Summit was being dispatched all day yesterday by Mountain Valley on the DB TG. They operated on 4821 all day. A few UID’s are 2018050 2018052 2018056
- Joined
- Feb 22, 2007
- Messages
- 6,181
I'm in the Villas right now in Lower Township, police are coming in five by five with great audio and I don't need any sweet spot. I'm only using the Cape May site for faster scanning of other things, using my sds100 with the remtronix SMA 100.
Site 29 (Rutgers) is no longer in wide mode ("isolated" in DSD+ terms), with a new Site 8 now appearing as a peer of the Hunterdon simulcast cell, using the same 774.79375 control channel that Site 29 was previously using.
The single digit/lower number sites have historically been simulcast cells, and so it stands to reason that Site 8 is also some sort of simulcast cell. Whether or not one of the subsites is still at Rutgers remains to be seen.
The single digit/lower number sites have historically been simulcast cells, and so it stands to reason that Site 8 is also some sort of simulcast cell. Whether or not one of the subsites is still at Rutgers remains to be seen.
- Joined
- Dec 22, 2005
- Messages
- 1,915
GTR8000 thanks. From my QTH I hear CC’s from Hammonton, Telegraph Hill to West Orange and Hunterdon. A quick look at the 700 band shows no site 29 this morning. It certainly does show Site 8 at about the same signal strength as missing 29.
My Unication was deaf to the Rutgers site even though the CC was in. Changed to site 8 and I have started hearing traffic in Wildcard mode.
However for now, only a few MedCentral units. No FG, Parks and so on but it is early.
- Joined
- Dec 22, 2005
- Messages
- 1,915
Martinsville Site 028 is simulcasting Site 008. Martinsville is also carrying the usual State FG and Parks traffic. Also heard same State traffic on Cranberry and Hunterdon. Site 008 is not simulcasting those Statewide TG’s.Hunterdon is also simulcasting Site 008.
Last edited by a moderator:
Hang on...I need to get my shovel and club...one to dig up the dead horse and the other to beat him again.
Sites are not simulcasting other sites. Martinsville, Hunterdon and Site 008 are on different frequencies.
It is simply carrying the traffic of an affiliated subscriber. If that talkgroup has permission on that site, you will hear the talkgroup from a subscriber on another site if it has the same permission. It’s MAGIC !!! Or just plain system design to not waste resources “simulcasting” Cape May SO on Alpine in Bergen County.
Sites are not simulcasting other sites. Martinsville, Hunterdon and Site 008 are on different frequencies.
It is simply carrying the traffic of an affiliated subscriber. If that talkgroup has permission on that site, you will hear the talkgroup from a subscriber on another site if it has the same permission. It’s MAGIC !!! Or just plain system design to not waste resources “simulcasting” Cape May SO on Alpine in Bergen County.
So do the West Orange and Union County "simulcasts" carry (simulcast) multiple "sites"? In other words, what exactly is the difference between a "site" and a "simulcast"?
West orange is a simulcast GROUP, with a hand full of sites all on the same frequency. Just like union etc...
The single sites are just one repeater site on its own frequency set that isnt rebroadcasting from multiple locations on the same frequency - unlike a simulcast site/group.
How the actual talkgroups are "simulcast" is up to the contract and needs of the particular TG. Its just poor language by those who explain it...
I can't believe we're still explaining how simulcasts work in 2019 lol.
P25 systems can have two types of sites: Standalone (individual) and Simulcast cell
- A standalone (individual) site is just that, one single physical site that has its own unique set of frequencies, and stands on its own. Although there may be other sites elsewhere in the system that use the same set of frequencies (e.g. Walpack and Martinsville), they are geographically separated and are not part of a simulcast cell.
- A simulcast cell is a virtual site comprised of multiple physical sites (known as subsites in Motorola parlance), all operating on the same set of frequencies, which are transmitting the same control/voice/data simultaneously from all subsites. The subscriber radios consider simulcast cells to be a single site, regardless of which physical location (subsite) within the cell they are closest to. In other words, using West Orange as the example, it doesn't matter if you're closer to Garrett Mtn or to Jersey City, it's all Site 1 regardless.
@Signal-Zero's point was that sites do not "simulcast" other sites, rather they are simply part of the system as a whole, and can carry any traffic required.
Naturally there are more factors involved, such as talkgroups that may be restricted to or permitted on specific sites only. Another factor could be whether or not a radio is affiliated with a talkgroup at a particular site, which could determine whether traffic from that talkgroup is heard on said site.
P25 systems can have two types of sites: Standalone (individual) and Simulcast cell
- A standalone (individual) site is just that, one single physical site that has its own unique set of frequencies, and stands on its own. Although there may be other sites elsewhere in the system that use the same set of frequencies (e.g. Walpack and Martinsville), they are geographically separated and are not part of a simulcast cell.
- A simulcast cell is a virtual site comprised of multiple physical sites (known as subsites in Motorola parlance), all operating on the same set of frequencies, which are transmitting the same control/voice/data simultaneously from all subsites. The subscriber radios consider simulcast cells to be a single site, regardless of which physical location (subsite) within the cell they are closest to. In other words, using West Orange as the example, it doesn't matter if you're closer to Garrett Mtn or to Jersey City, it's all Site 1 regardless.
@Signal-Zero's point was that sites do not "simulcast" other sites, rather they are simply part of the system as a whole, and can carry any traffic required.
Naturally there are more factors involved, such as talkgroups that may be restricted to or permitted on specific sites only. Another factor could be whether or not a radio is affiliated with a talkgroup at a particular site, which could determine whether traffic from that talkgroup is heard on said site.
In my profession...there are simulcast and multi-site. Simulcast is just that; A group of sites with the same frequencies and simultaneously transmit the same conversation to the simulcast cluster of sites. Even sites where no one may even be listening. That's great for scanner owners since they can hear all conversations on all talkgroups. The downside is the LSM issue that most scanners have a hard time dealing with. But the SDS series can deal with it. Bordentown and West Orange simulcasts are just 2 examples of cluster of sites using the same frequency
Multi-site are basically standalone sites yet still part of the overall system. Independent frequencies. But...if no one is affiliated on that site with the talkgroup that you want to listen to...you will get nothing!(provided that's the only site you are locked onto and not scanning any others),
Since my SDS100 nicely scans all the sites it can hear in the area and since I live close to both simulcast and multi-site...Usually a good chance I will hear most of the conversations.
One issue is with NJTPD...they have North Patrol and South Patrol talkgroups and I mainly hear south since many of their road units are on the simulcast sites. For the north...I don't hear them as much unless one of their vehicles affiliates on the southern simulcast or the stand alone site near me.
Multi-site are basically standalone sites yet still part of the overall system. Independent frequencies. But...if no one is affiliated on that site with the talkgroup that you want to listen to...you will get nothing!(provided that's the only site you are locked onto and not scanning any others),
Since my SDS100 nicely scans all the sites it can hear in the area and since I live close to both simulcast and multi-site...Usually a good chance I will hear most of the conversations.
One issue is with NJTPD...they have North Patrol and South Patrol talkgroups and I mainly hear south since many of their road units are on the simulcast sites. For the north...I don't hear them as much unless one of their vehicles affiliates on the southern simulcast or the stand alone site near me.
You guys are way too nice and have a higher tolerance than I do LOL.
I can’t wait until they start combining standone sites up north into a simulcast cell of several sub sites. Oh this is going to confuse the masses but it’s coming.
I can’t wait until they start combining standone sites up north into a simulcast cell of several sub sites. Oh this is going to confuse the masses but it’s coming.
It'll be nice once some of those sites are consolidated into countywide cells, that's for sure.
richee2000
Communications Professional
getting hits on TG 4683 and 4685, possibly encrypted
Last edited:
Richee...my notes show 4683 as Union PD TTY and 4685 as Union PD INV (both encrypted).
richee2000
Communications Professional
thanks.. not in DataBase
Just a thought might be to include typical (expected) radio traffic/use for each site
- Status
Similar threads
- Locked