[TowerTalk] FD antenna assembly

[Tom Hellem]

Thanks to all who have responded and I apologize for not being clear in
what
I was looking for in my original post. We have the element tubing joints
figured out,
pretty much the exact joint used on the original C-3 with the rivets. The
disassembled
yagi will be hauled and stored inside of a 16' long tube on a trailer, so
the individual elements
will not need to be taken apart except at only one place on each of the 20
& 15 mtr. elements.
We have handled that by using slit tubing with a hose clamp. They go
together in seconds.
What we really need are some ideas for attaching the completed elements to
the boom.
The hope is that we can come up with a method that can be also accomplished
in seconds
or at the most, in minutes. The original C-3 element mounting method using
2 u-bolts on each
does not meet this criteria. Whatever method we use, it has to be strong
enough to withstand
a 60 MPH wind, at least, because we do get thunderstorms here in Montana at
the end of June.

One more piece of info- The tube on the trailer is 8" in diameter. The boom
will be
stored inside this tube along with the elements.

Thanks again for all the input, folks.

Tom
K0SN



On Sun, Jan 1, 2017 at 11:23 AM, mike repinski via TowerTalk <
towertalk at contesting.com> wrote:

>
>  I haven't put a tent up for many years, but I remember the quick
> disconnect tent poles from my youth. You pushed in a wire spring to release
> the tube. Maybe this could be fitted to your elements. Sure beats that tape
> goooo. Mike
>
>
>
>
>
> -----Original Message-----
> From: jimlux <jimlux at earthlink.net>
> To: towertalk <towertalk at contesting.com>
> Sent: Sun, Jan 1, 2017 1:04 pm
> Subject: [TowerTalk] FD antenna assembly
>
>
>
>
> -------- Forwarded Message --------
> Subject: Re: [TowerTalk] Yagi Building Ideas
> Date: Sun, 1 Jan 2017 10:01:58 -0800
> From: jimlux <jimlux at earthlink.net>
> To: W0MU Mike Fatchett <w0mu at w0mu.com>
>
> On 1/1/17 9:48 AM, W0MU Mike Fatchett wrote:
> > I have used a different color spray paint and hit the joints with the
> > paint, one color for each band.  The only issue you may have with the
> > C3's is that the holes were not drilled at the same place at each
> > element.  With a number of ownership changes maybe that was changed.  It
> > appears they drilled the holes on the fly and got close but not perfect
> > so you may or may not be able to get the rivets in.
> >
>
> You can make the holes a bit oversize.  It's not like you're worried
> about the tolerances getting sloppy in 10 years of wind induced movement.
>
> Actually, what might be easiest is this: glue a thin ring on the smaller
> of the two pieces so that it butts up against the larger piece when it's
> inserted to the right length. Slide it in with a snug fit some turns of
> tape, and you're done.
>
> Why put *any* fastener in.  It only has to survive for a couple days,
> and duct tape will do that just fine.
>
> You don't need hose clamps, screws, rivets, etc.
>
> Your pre-FD prep would be cleaning up the elements a bit before
> assembly, throwing away that icky roll of tape from last year that's
> oozed over everything, and buying a new roll a tape.
>
> the tent pole shock cord technique would work real well with this scheme
> too.
>
>
>
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