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[TowerTalk] Tower top & C31XR

To: <towertalk@contesting.com>
Subject: [TowerTalk] Tower top & C31XR
From: wa9als@starband.net (WA9ALS - John)
Date: Thu, 30 Aug 2001 13:18:11 -0500
> Does anyone know if the C31XR 15m tuning problem is how related to its
above
> the top of the tower i.e. could the proximity of the top of the tower to
the
> parallel lines running between the 10 and 20m driven produce the strange
> problems that have been reported by other?

I never had a 15M tuning problem.  I first had mine at about 30 ft up the
side of my Glen Martin tower.  I used an MFJ meter with about 80 ft of
Bury-Flex on it to make the initial readings.  I adjusted the hairpin coil a
little back and forth trying to bring the 20M SWR as low as possible - 15M
and 10M were <1.2 and 20M was about 1.5 at 14080 and improving to 1:1 up in
the phone section.  I never had to adjust driver lengths.

Then at the final resting place - 2 feet above the thrust bearing, 72 ft
total above ground, now with this series of coax:  80 ft Bury-Flex, 550 ft
LMR600DB, and finally another 50 ft or so of Bury-Flex.  (You gota do what
you gotta do).  The SWR now measured inside the shack was almost identical
to that measured earlier, lower, and with less coax.  I guess I don't
believe proximity to the top of the tower is related to an 15M SWR problems.

Good luck and DX!



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