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Re: [TowerTalk] Measuring Coax Length

To: "john@kk9a.com" <john@kk9a.com>
Subject: Re: [TowerTalk] Measuring Coax Length
From: Matthew Kaufman <matthew@matthew.at>
Date: Tue, 28 Oct 2014 19:07:42 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I would use 9913.. if I ran out of 1/2" water hose. Just remember to use hose 
thread fittings, not PL-259.

Matthew Kaufman

(Sent from my iPhone)

> On Oct 28, 2014, at 6:31 PM, "john@kk9a.com" <john@kk9a.com> wrote:
> 
> I would not use Belden 9913 outdoors, especially if underground. Some
> years back I also purchase 9913 but I threw mine away because it was too
> susceptible to water ingress.
> 
> John KK9A
> 
> 
> To:    Towertalk Reflector <towertalk@contesting.com>
> Subject:    [TowerTalk] Measuring Coax Length
> From:    Mike Fahmie via TowerTalk <towertalk@contesting.com>
> Reply-to:    Mike Fahmie <wa6zty@yahoo.com>
> Date:    Tue, 28 Oct 2014 21:15:55 +0000 (UTC)
> 
> Some years back, I purchased a 500' reel of Belden 9913 and used a bit
> here and
> there over the years.  Now I needed four 70' runs to the base of my tower but
> didn't know how much 9913 remained on the reel.
> My DVM can measure capacitance so I connected it to the free end of the reel
> and measured 6300 pF.  Belden says that 9913 capacitance is 24.6 pF/ft so
> dividing that into 6300 pF implied that I had 256 ft remaining.  That was
> enough for three 70' runs but not enough for four,  oh well.
> I cut three 70' lengths from the reel, 45' of cable remained.  (3 x 70) +
> 45 =
> 255.  That is just 1 ft less than what was predicted by the capacitance
> measurement !!!  Isn't it nice when the numbers work out so well.  Will I
> rely
> on that technique in the future?  Nope, gotta see it work out like that a few
> more times first!
> -Mike-WA6ZTY
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