I too own a F12 yagi. Mine is the C-4XL 40/20/15/10m that I obtained used from
a ham in Indiana. It came to me needing a few "sticks" of tubing replaced. The
seller supplied the new pieces. I needed to source the pop rivets. It turns out
the "aircraft" rivets (according to Force12) are just corrosion resistant
steel, that I obtained from McMaster-Carr.
I've had it up only a few years but, so far, so good atop my 72' tower. It has
weathered several strong Pacific Northwet storms here in Everwet, WA.
vy 73 es gl,Bryan WA7PRC
Date: Fri, 7 Aug 2015 22:02:00 -0700
From: Robert Harmon <k6uj@pacbell.net>
To: "<towertalk@contesting.com>" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Shorty Forty Hose Clamp thread
Doug,
I no longer use hose clamps after having them strip as you had happen or the
connection
loosening after flexing back and forth in the wind (I am also in the Pacific NW)
Now I only use rivets. I have had a number of Force 12 antennas and no problem
at all with the connections. Their riveted conns sold me. The HF beams I have
fabbed have riveted elements
and no problems. I wipe on Penetrox when assembling and later when taking apart
the tubing is like new. Plus to change element lengths it is super easy to
drill
out the center of the rivets, they pop right out. Now I can sleep easy while
the winds blow, hihi.
The Cushcraft XM240 at 85 feet should be great. I will be hoisting up a Force
12 20M 3EL / 40M 2EL
interlaced on a 28 foot boom in a couple of weeks. For 40 the best I have had
is a rotatable
dipole so it will be fun to see how two elements will do.
73,
Bob
K6UJ
> On Aug 7, 2015, at 9:06 PM, W7ZZ <w7zz@wavecable.com> wrote:
>
> It's ironic that this thread just showed up. By coincidence, I put up a
> Cushcraft XM240 just last Friday at 85 feet. Since I managed to "strip"
> several of the hose clamps as I built the antenna, trying to tighten them to
> the max, I decided to augment the hose clamps by drilling holes at each
> joint to insert a stainless steel self tapping screw to eliminate the danger
> that the elements could move or, worse still, fall out after the antenna was
> at an unserviceable height. We get some hellacious windstorms here in the
> Pacific NW and I could just envision that antenna at 85 feet, totally
> unreachable without hiring a crane again, with a missing end piece. I will
> sleep better at night knowing that the screws are in there. I don't know
> anything about pop rivets, but they sound even better but the screws should
> work well.
>
>
>
> W7ZZ
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