Multiple UHF Linking?

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aerosox
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Joined: Mon Apr 22, 2013 12:29 am

Multiple UHF Linking?

Post by aerosox »

Im currently running a repeater with 2x CDM1550 LS+ UHF and wanted to link another repeater site to extend our coverage may i know how to do that without going through a voter system?
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Bill_G
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Re: Multiple UHF Linking?

Post by Bill_G »

You don't need a voter for that. Just use a simplex link with a freq far enough away to not desense the local repeater input at each end. The repeater receiver at each site will key two transmitters at once. You could use the existing RICKs, but you'll need to balance the mic input impedances with a resistor bridge. You'll should turn your squelch tail down to zero to make it easier to use.
aerosox
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Re: Multiple UHF Linking?

Post by aerosox »

so each site will have 3 mobiles and 2x for RX & TX and 1for simplex to another site?
i'm not running R.I.C.K but the 16pin motorola interface card like this http://www.ebay.com/itm/For-Motorola-Ra ... 3a7e27de62

Site 1
RX - 460.000 pl 77.0
TX - 450.000 pl 77.0
Simplex TX - 145.000 100.0

Site 2
RX - 460.000 pl 77.0
TX - 450.000 pl 77.0
Simplex TX - 145.000 100.0
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Bill_G
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Re: Multiple UHF Linking?

Post by Bill_G »

That is a weird split. Maybe you're using it as an example. In that case, yes - that is the concept. It looks like you're trying to set up a poor man's simulcast. As long as the two systems are far enough apart to not overlap coverage, you can get away with it. Otherwise, it will sound pretty bad. You are better off with two different repeater pairs linked together if the overlap is significant.

However, the doodad you linked on Ebay is uni-directional, and you need a three headed bi-directional cable. I suppose you could buy 6 of these cables to build the 2 you need.
Will
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Joined: Tue Sep 04, 2001 4:00 pm

Re: Multiple UHF Linking?

Post by Will »

We used to make the interface box the size of a pack of king size cigarettes for just that application. Problem was it cost too much to build.

Still have some of the circuit boards left.
aerosox
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Posts: 7
Joined: Mon Apr 22, 2013 12:29 am

Re: Multiple UHF Linking?

Post by aerosox »

Bill_G wrote:That is a weird split. Maybe you're using it as an example. In that case, yes - that is the concept. It looks like you're trying to set up a poor man's simulcast. As long as the two systems are far enough apart to not overlap coverage, you can get away with it. Otherwise, it will sound pretty bad. You are better off with two different repeater pairs linked together if the overlap is significant.

However, the doodad you linked on Ebay is uni-directional, and you need a three headed bi-directional cable. I suppose you could buy 6 of these cables to build the 2 you need.
you mean 3 sets of this cable? http://www.ebay.com/itm/Duplex-Repeater ... 0095375952
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Bill_G
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Re: Multiple UHF Linking?

Post by Bill_G »

Yes. You should buy three of those so you have hack them into two 3 headed cables.
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