[TowerTalk] Questions

[Roger (K8RI) on TT]

LMR-400 is a poor choice for outdoor use, Even Times Wire rate its life 
at 10 years. It is flexible, but the jacket does not hold up. It's a 
rubber like material that is easily abraded. I had 5 28' pigtails that 
also served as rotator loops.  4 abraded to the point that the fpil was 
visible. One looked good, but the jacket was no longer waterproof. For 
flexibility and slippery, I'd go with Davis BuryFlex.

I managed to get 6 years out of the LMR400UF. I have a bunch of LMR600UF 
that I purchased before I found out about the short lifetime.
I now use it in conduit to the towers.

73

Roger (K8RI)


On 8/31/2016 Wednesday 8:29 AM, john at kk9a.com wrote:
> I concur that using the same cable from the radio to the antenna 270 feet
> away is a poor choice. Some cables are flexible and some have lower
> losses. I was going to make a similar suggestion when I initially read the
> post. I have many very different cables going from the shack to the
> antenna.
>
> It sounds like your stacking relays are mounted up the tower.  While
> slightly more costly to install, I think that they are better at ground
> level.  It is much easier to check for individual antenna problems and
> relay issues while standing on the ground.
>
> John KK9A
>
>
> To:	<towertalk at contesting.com>
> Subject:	Re: [TowerTalk] Questions
> From:	"Ed Sawyer" <sawyered at earthlink.net>
> Reply-to:	sawyered at earthlink.net
> Date:	Wed, 31 Aug 2016 01:23:52 -0400
>
>
> I think it's a mistake to run the same cable for 270ft for this application.
> I would run the lowest loss you can afford for the main run - LDF4 or LMR600
> and then shift to a more flexible cable at the tower - LMR400flex or worst
> case RG213.
>
>
>
> I run 3 sets of coaxes for my systems.  LDF5 from the shack to the switching
> at the towers.  LDF4 from there to the stack matches and them LMR400flex
> from the stack matches to the beams.
>
>
>
> Ed  N1UR
>
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-- 

73

Roger (K8RI)


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