Voting a mobile transceiver

[lafirerescue]

Hi all I have a Motorola spectra hooked up to a tone remote adapter using an MC1000 console. It works great. Now I am looking to link it with 3 other spectras through te1co lines since we have telco lines at each location. My question is what equipment do I need to control the linked sites to the main station with the control remote with console?

[d119]

Could you be a little more specific?

Are you using 1 as a transmitter and the rest as receivers?

What is your goal?

[lafirerescue]

we have 3 squads in a 10 mile range we would like to have our dispatchers to listen to fire ground at the dispatch center, we have the spectra and mc1000 at the dispatch center but cant pick up fire ground in some areas, we a t1 line a the dispatch center and a t1line at the squad houses, we would like to ad a spectra to squad houses to extend the rx for the dispatcher, it will be nice if the dispatcher could tx back to them but the main priority is to link the rx to the dispatcher from the squad houses.

[d119]

The proper way to do this would be as follows, assuming this is an analog channel:

With new equipment:

MTR2000 Receive-only stations at each squad house. 2-wire circuits back to the dispatch center (or multiplex using RAD equipment onto the T-Carrier circuit you already have)

DigiTAC voting comparator at the dispatch center to vote said receivers and route audio into console.

With used equipment:

Get some SpectraTAC receivers on the appropriate bands, crystal them up on your fireground frequency and run them into a SpectraTAC comparator a-la 2-wire circuits or T-Carrier multiplex.

You COULD use Spectras as voting receivers, but you'd have to use an outboard status tone generator (a-la Raytheon-JPS PTG-1) or even just a Communications Specialists SS32B (if they still make that) set to 2175Hz and carrier controlled.

You still need a voter, and I just can't recommend lashing up Spectras as voting receivers in a public-safety application... Too much crap.

Buy the right stuff and it'll last forever.

[lafirerescue]

Hi all I found a old spectra-tac and I connected all mobiles to the spectra-tac it works good with a mc2000 over T1 lines, my question is how could the dispatcher talk back to a selected radio only in the area ware the fire personal are operating, for instance if there is two jobs going on at the same time in two areas the dispatcher should listen to both jobs an be able to talk back to one areas without interrupting with the outer operations.

[d119]

This is not really the correct way to go about doing this in a public safety application...

You need to have an engineer come out there and help you redesign a new system or reconfigure the existing equipment... Considering it's a life/safety system, I'd think any other answers you get on here through very seriously prior to implementing them.