Multi-site Trunking Type C
I work with a multi site (soon to be 25 sites) in Florida.
We have sites ranging from 1 channel (gap fillers) to 7 repeater sites with 2 rolling control channels.
(majority is 3 channel on up)
This is a multi radio shop venture also, the big key in this all is the owners working together to
serve their customer with communications, and the ability to roam through various areas.
The Florida NXDN Network is a fast growing network of sites, and so far, one of the best running systems.
Coverage will soon be Key West to Jacksonville (I-95 coverage) and Daytona to Tampa (I-4 corridor),
work is in progress for South West Florida and the I-75 areas Tampa northward.
AVL; you need depth in the system to really have an AVL network working good, otherwise you can swap
your control channel quickly. I have AVL on PTT and on demand (when polled) on my NX-5300/5800 and NX-800.
Several customer are also setup that way with PTT AVL. If you need AVL with a big customer, use a cellular source
of AVL-GPS. Other option is to set up a Stand Alone NXR-x10 for GPS on a conventional channel (NX can channel stear GPS)
Consoles; by far I am impressed with NexeTALK, true ip dispatching and AVL tracking.
Sites; I feel it is better to have a static IP for each site, this keeps your VPN stable between sites.
Plan on no less than 2 repeaters per 60 user, spec says 90 but that can get chewed up on a big client.
In heavy user areas (like a garbage company) better plan on 3 absolute minimum repeaters.
*Another thing, if you can get FB8's (not paper loading) get at least 2 FB8's for your control channels per site
I know McKenna mentioned several other things, so I won't repeat those, but 6.25 or VNFM is the way to go if your going to have multiple sites. Single site you can use either 12.5 or 6.25, but things seem
to work better at 6.25.
(psst save the money and get the 10 Mhz oscillators on ebay, forgot the name of the seller but a 24vDC
costs around 150 to 200$, so long as you have one, the system works great) I am using EF Johnson
Viking Oscilators from our old 800 trunking system, has 1.25Khz and 10Mhz clocks) old but very stable.
Another tid-bit, is you go more than 10 repeaters deep, you will need to oscillate the next set beyond 10,
I have heard reports of 15 repeaters on one oscillator getting out of sync due to the time signal being at
-110 dBm on the 13th through 15th repeater. Just saying.
Have your site build out on paper and make good notes as your building out. It's very easy to lose
train of thought on a massive build-out, but in the long run, you will find people like the Kenwood
sound and use better than that batwing system. (wink wink)
EFM
