RG-400 is stranded center conductor. If you have a solid center conductor, it may be RG-142 that you have. RG-400 and RG-142 will give about 75 dB isolation from leakage. Foil & braid shielded coax will give about 90dB. Hardline (solid copper tube) will give about 110dB of isolation.
So, hardline is the best at 110db isolation. I would use the N connectors that you have and then use a GOOD quality adapter to take it from N to UHF (not radio shack). Better yet would be changing the connector on the radio to an N.
RG-400 or RG-142 would be the easiest. You could probably fit a UHF connector easily to this cable for the equipment end, and an N connector on the other for the duplexer.
I would stay away from foil & braid shielded coax. I have never been happy with either the crimp or the compression connectors for this style cable. It can be used, but extreme care is needed to get a good quality connection. Then there is always the argument of noise..........
Remember, some repeaters work perfectly well with RG-8 jumpers on the duplexers. Commercial duplexers sometimes come with RG-8 interconnecting cables. If you are trying to solve a desense problem, it may not be the jumpers that are causing the problem. It never hurts to use the best, but it may not be the fix for the problem at hand.
Message: 3
Date: Fri, 11 Jun 2004 08:04:20 -0700
From: Mathew Quaife <[EMAIL PROTECTED]>
Subject: Re: Re: Duplexer cable question
Ok, couple of questions. Is RG400 a solid center conductor, or is it
stranded. The Cable that I have here was supposed to be LMR400, but
that is made by Times Microwave, and the cable that I used on the repeater
is made by Ultralink, Cushcradt, Manchester NH. Does not really have
any other figures on it. Also, if the shield is made of steel, and is
not magnetic, then how would one get solder to stick to it. Or is this
why some guys are going to the crimp on connectors? I have plenty of
1/2 superflex avaialable, but you are right, the connectors are hard to
come by in UHF. Duplexers have type N, but it is easy to change the
connector in the radio's to Type N. I also have a good amount of 3/8"
hardline, FSJ something or other, Superflex cable, would that be as good
as the RG-400? Thanks for the information. The help is more than
appreciate.
Mathew
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