Likewise!
I used to believe that if you properly weatherproofed the connections
on 9913, all would be OK. Then the tower took a direct lightening
strike that removed all the weatherproofing and plating from the
connectors.
A few minutes later I had water running out of the 2-meter rig and onto
the desk. It also ruined the desk.
I gave away all the 9913 I thought I had, which was about 1500 feet,
plus a few hundred feet of unused. A couple years ago, the SWR went up
on the 40 meter center fed, half wave sloper. When I disconnected a
splice in the junction box where the cable came in, water ran out, so I
had missed a piece.
I replaced all of the free swinging coax to the slopers with Davis
BuryFlex (TM) Although I have used 8X successfully to the 40 antennas
running the legal limit with no failures. I prefer the 8X in that use
as it has low wind resistance.
73
Roger (K8RI)
On 10/28/2014 9:31 PM, 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
_________________
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
--
73
Roger (K8RI)
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|