My single tower contest station is based on a 38' sailboat. I use a pair of
Jackite's largest poles to support an inductively shortened 40/15 M dipole and
another pair for a 20/15 M dipole. I need to shorten the 40M because while tied
to the dock I don't have enough room due to sailboats two docks away on either
side of me. If I'm out at anchor then no problem.
The 40M is built using hand-wound air inductors using the dimensional and coil
data from K7MEM's web site (http://www.k7mem.com/). The 20/10M combo is a
Skeleton Sleeve by KL0S found in several ARRL publications.
I also use Jackite's 31' version to support the top end of the 160/80M
vertical. It is affixed to a sliding carrier that attaches to the main sail
track of the boats 45' mast.
They make several that they call their Platinum - Flex Tip series that have
thicker tubing walls and tips. Unfortunately the longest is only 27'.
All have reinforced butt/bottom end sections. Longest they offer is 31' but
they meet my needs. All are excellent quality in my opinion. The antennas go up
on Fridays and down on Mondays for contests and the poles are great for my use.
73,
Patrick. W7TMT
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Jim Brown
Sent: Wednesday, February 17, 2021 01:41
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Wire Antenna Supports
On 2/16/2021 9:08 PM, W7TMT - Patrick wrote:
> he flimsy masts have their purpose. I have several from Jackite
> (https://www.jackite.com/) which I've found to much better quality than the
> Ham suppliers offer.
Yes. Slide 12 of http://k9yc.com/7QP.pdf shows two Jackite poles mounted to a
plate at the top of the pneumatic mast on W6GJB's contesting trailer,
supporting wires that form a 40M dipole. The next slide shows how we use
surplus modular military surplus mast sections to for a tower. The legs are two
4-ft sections, which gets the tripod high enough that mast sections can be
added and pushed up to extend it. It's no trick to get it up 25-30 ft
Later slides show an 80M inverted V rigged about 3 ft below the 40M dipole.
W6GJB found a vendor selling the tripod fittings at Dayton some years ago. This
concept is something that K7JA showed in a talk about Field Day ideas, I think
at Visalia.
73, Jim K9YC
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