Thanks for the explanation Nate. Reminds me of Smartnet II simulcast
systems locally (one TG brings up all five sites for example).
Tony
Nate Duehr wrote:
>
> Each repeater handles two 6.25 KHz "channels" simultaneously, if
> that's what you mean...? But both "channels" are continuously received
> by the portables/mobiles. The transmission is one big interlaced TDMA
> signal that takes up the full 12.5 KHz spectrum even if only one
> "channel" is in use.
>
> I can be on user ID 00000100, TG 00000100 talking to you, user ID
> 00000200 on one channel...
>
> And someone else can be simultaneously talking as user ID 00000300, on
> TG 00000200 to user 00000400.
>
> And we won't hear each other. On the same repeater.
>
> If you buy their trunking stuff, you can then link repeaters at a
> site, and each repeater box means two more simultaneous "channels" of
> data. How the system directs the mobile/portables as to which
> frequency to monitor, I don't know.
>
> Moto uses "color names" for the channels. The local system some hams
> here built has two "colors"... one is local traffic, the other is
> routed to the IP link to some other repeaters full-time. In practice,
> these are programmed as "Channel 1" and "Channel 2" in the
> portables/mobiles. Want to talk locally? Channel 1. To someone on one
> of the IP linked repeaters, "Channel 2".
>
> AFAIK the repeater doesn't "care" at all about any of this. The rigs
> are receiving both channels at the same time, and just watch for the
> "Color Code", Unit ID (in the case of unit-to-unit calling) or their
> TG and open "squelch" appropriately.
>
> That probably changes in the trunked environment - the repeaters
> obviously must be "active" in deciding which transmitter to turn on.
> Don't know how that piece works when you grow beyond a single
> repeater. I assume there's data being transmitted from one or more
> transmitters continuously that tells the mobile/portables when to
> frequency hop.
>
> In IP linking without trunking, I believe all transmitters go active
> if you transmit on the "color" that's linked. Don't know how it
> handles "glare" (Someone transmits on Repeater A's "color code" that's
> IP linked to Repeater B and someone else keys up at the same time on
> Repeater B with the same "color code".)
>
> Also don't know what gets priority if someone places a unit-to-unit
> call on the "local color" at the same time as a "remote" linked call
> for the same Unit ID comes in, but that logic would be in the
> portable/mobile rigs, not the repeater.
>
> Nate WY0X
>
> On Mar 11, 2010, at 9:10 AM, MCH wrote:
>
> > And how many of these TGs can be used in a repeater at the same time?
> >
> > Thanks,
> > Joe M.
>
>
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