[TowerTalk] Yagi Building Ideas

[john at kk9a.com]

I am not sure what "It's modeled upon the F-12 C-3 line" means.  Is this a
copy of a C3?  If I recall the Force12 C3 has permanently riveted element
plates and the elements are attached to these plates with two u-bolts so
there is no measuring needed. This seems like it would be pretty fast to
assemble. The only Force 12 product that I have used (40m dipole at P40A)
did not come with stainless steel u-bolts. If you antenna does, it would be
easy to swap either the bolt or the nuts with plated steel so you would not
have to worry about galling. I am sure that you could put a socket into a
battery powered drill to speed up tightening/loosening the nuts and maybe
even shorten the tread length to require a minimal amount of turns. They do
make quick release duct clamps with a latch but I think they are only
available in sizes too large for your elements. 

GL
John KK9A



To:	W0MU Mike Fatchett <w0mu at w0mu.com>
Subject:	Re: [TowerTalk] Yagi Building Ideas
From:	Tom Hellem <tom.hellem at gmail.com>
Date:	Sun, 1 Jan 2017 09:43:09 -0700

Mike-
Agreed, the U-bolts are reasonably fast if you have maybe 2 elements.
A C-3 has 7 elements, that's 28 nuts you have to keep track of, install,
tighten, etc. And if they are SS now you have to contend with the thread
galling issue. I was thinking more along the lines of something like
a couple hose clamps per element, a quick tightening with a nut driver
mounted in a cordless drill perhaps. One would need to have some sort
of fixture in place on the boom so the hose clamps would have something
to attach to. That is the part I am hoping somebody has already invented.
Or ????

K0SN

On 1/1/2017 8:59 AM, Tom Hellem wrote:
>
>> Hi All-
>> Our radio club is building a yagi to be used mostly for Field Day type
>> setups.
>> It's modeled upon the F-12 C-3 line, with the difference being we are not
>> crazy about the element to boom mounting method with the u-bolts. I would
>> like to come up with something that is MUCH faster to assemble and
>> dis-assemble.
>>
>> We have a few ideas but would sure like to know of any others out there.
>> Do any of you have some that you would be willing to share with us and
the
>> group?
>>
>> 73 and HNY to all.
>>
>> Tom
>> K0SN
>> _________