Last winter I had a couple FT-240 Fair-Rite #31 cores on my receive antennas
break. They were on the ground here in upstate NY.
I assembled four 3/4 wave phase lines for my 80M 4-sq using the largest
clamp-on cores #31 with 8 turns of RG-6 through each based on
recommendations in K9YC's info. I am getting concerned about protecting the
cores from the weather.
73,
N2TK, Tony
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Tom
Frenaye
Sent: Thursday, June 29, 2017 4:03 PM
To: jim@audiosystemsgroup.com; towertalk@contesting.com
Subject: Re: [TowerTalk] waterproofing big #31 clamp-on choke
At 01:50 PM 6/29/2017, Jim Brown wrote:
>Since I first published this work around 2007, I've yet to receive word of
problems from moisture, except a single report of cracking from freeze/thaw
with multiple cores. That's only one report in 9 years.
Jim -
Add me to the list, I've had cores disintegrate over the years. I use
several them at the base of my 80 and 160 4-square verticals, wrapped in
electrical tape to hold them together. The problem could have been
freeze/thaw cycles, or heating when one of the verticals detunes when it
breaks and I didn't notice the problem on the shack end.
I suspect those of us in ice/snow country see it more often than the San
Jose area does... Haven't found a good solution yet, I have trouble
imaging that the addition of a box and associated connectors, caulking and
hardware will be more reliable over time.
-- Tom
----------------------------------------------------------------------------
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e-mail: frenaye@pcnet.com YCCC --> http://www.yccc.org/
Tom Frenaye, K1KI, P O Box J, West Suffield CT 06093 Phone: 860-668-5444
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