So you're using a piece of SINGLE SHIELD coax that you have
reason to believe may have been exposed to WATER, and
you're wondering if you should get rid of it?? Yes! Do
yourself a favor and get a piece of hardline or at the very
least RG-214/U with double silver shield. Also make sure
the connectors are high quality and properly installed. You
are asking for duplex problems with that piece of coax.
(And yes I have tried to use RG-213 in duplex service at VHF
with poor results! I have had good luck with good quality
RG-214/U for temporary runs under 75 feet, though I now
only use hardline on my repeaters)
Paul N1BUG
On Tuesday 14 December 2004 11:46 am, DCFluX wrote:
> Duplex noise of the worse kind. Repeater and duplexer
> are fine into a dummy load with no desence at all.
>
> Removing the RC-850 did bring the noise level down
> somewhat. I took Lee's advice.
>
> The repeater is a GE MASTR-II base that I converted to
> full duplex. 146.64/04. Last weekend I overhaulled it
> replacing the cheap coax in the reciever with RG-223 and
> a BNC panel mount connector to replace the RCA plastic
> feed through to get as close to 100% shielding on the RX
> lead as possible. RX does 1.2uV for full quieting and .45
> for the 12 dB sinad just like it should.
>
> This piece of coax that is the run between the antenna
> and duplexer was absconded from a tower and it had a UHF
> TV transmitter connected to it at one point in time,
> runnning 100 watts AMTV Continuous. I think the top
> connector wasn't wraped in tape when the antenna was
> removed, so water had 3 months to soak into it. Seems
> that ever since we started using this coax, are problems
> started. when we moved the repeater this past month we
> used the same piece of coax as well.
>
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