[TowerTalk] Measuring Coax Length

[Gary - AB9M]

I used 9913 to feed a TH-7 at 50 feet for over 20 years with no water 
intrusion.  I did however use a rotor loop with solid dielectric, a double 
female UHF connector to splice the two PL-259 connectors terminating the two 
cables and a waterproof covering of multiple layers of Scotch High Voltage 
rubber splicing tape, 88 tape, and Scotch Kote. When the cable was taken 
down and the splice opened there was NO sign of water in the splice or the 
9913.

If you got water in 9913, you'll most likely get water in other cables as 
well IF you use PL-259 connectors and fail to provide a waterproof covering.

BTW, we average 40 inches of rain per year at my QTH.

73 & DX,

Gary - AB9M

-----Original Message----- 
From: Matthew Kaufman
Sent: Tuesday, October 28, 2014 9:07 PM
To: john at kk9a.com
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] Measuring Coax Length

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 at kk9a.com" <john at 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 at contesting.com>
> Subject:    [TowerTalk] Measuring Coax Length
> From:    Mike Fahmie via TowerTalk <towertalk at contesting.com>
> Reply-to:    Mike Fahmie <wa6zty at 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
> _________________
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk