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SmartZone Still Baffles Me!!!

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policefreak

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Hmmm! I am monitoring a smartzone system. The system I am monitoring is set up with different sites in the different sections of the county (Okay, for clarification, i am monitoring Burlington County, NJ).
Well, here is the thing. I have the West site programmed into my scanner. Yet I am picking up ambulances and police from the northeastern sector of the county (From Northeast Response 1 TGID if your familiar with it). I also get North Response, Northcentral response, and Northwest response. This seems to happen often. Now, I could almost understand getting Northwest on the west system, because they're pretty close to each other, so if a NW ambulance is en route to the hospital which is covered in the West zone, then the west tower should pick it up. But Northeast, North Central and North are all pretty far from the west zone. So its weird. *Duh!*
I did a cool little experiment. I programmed the Northcentral system into my scanner, and noticed that I was picking up the West police, and West Response (Ambulance/Fire). But in the middle of the transmission, if I quickly hopped over to the west site, I would not receive transmissions from those units.
I just think its kind of screwy. I mean, how do the Emergency workers do it? Do they have to program every freq into their radio? Better yet, here is the question that has been burning a hole in my head. When a fire engine from west response or maybe even dispatch makes a transmission, and it ends up on north central response, does the same transmission get simulcasted on any of the other sites?
 

Joseph11

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If someone TXes on a TG on the west site and someone has a radio on that TG on the north site, it'll come over that site. Same with any other site (ex. Fire Ops on the south site on South Response 1 will come over the east site if someone's on the east site listening to that TG). It could also be a fixed patch, but I think the first explanation is what's happening.
 
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RocketNJ

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To clarify a little more...

Take a two zone SmartZone system for example. If all the users of a particular talkgroup are only in one zone and one user keys up the SmartZone controller will only assign a channel in that zone. The other zone will not transmit the message.

In Burlington's situation there is a lot of overlap coverage between zones. Users on the west talkgroup for example may be affiliated with the west zone and northcentral zone. So therefore when a user keys up on west talkgroup the system assigns channels in both west and northcentral zones.

The system administrator can restrictcertain talkgroups to only operate in certain zones. NJSP Troops A, B, and C are prime example. Some talkgroups can be heard statewide while others only in that troop.

To even complicate it a little more. If a user has west talkgroup in his scan list as non priority channel and his radio is in scan. If he is affiliated with a zone where there are no other users with west talkgroup selected then his radio will not hear that talkgroup while scanning.

It is the system admin's job to decide which talkgroups are allowed wide area coverage and which should be restricted to certain zones. Usually loading is a concern so you don't want an officer going home across the county with his portable listening to a talkgroup, causing a channel to be assigned in the zone covering his house.
 
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