[TowerTalk] Shorty 40

[Ron Chambers]

We made it thru most of the asembly of the Moxon as time allowed, in between
CQWW and fixin' other stuff, but are not 100% complete. Anyway, behind
schedule reporting in.

And since I think Dave is off at HC8N, in his absence I need some info from
anyone that has already assembled his 120mph Moxon antenna:

The Tee mounting plate has one set of its u-bolts set 1/2" off of the
centerline of the plate. I find no reference to the proper orientation of
the plate relative to the Tee and corresponding element. (nor did I see the
dimension from centerline of the boom to the centerline of the Tee element
which would also answer this question.) Maybe something obvious I missed.

Any "been there, done that"?

Ron
N5QQ




On 10/18/07, Ron Chambers <rwchambers at gmail.com> wrote:
>
> This weekend or maybe next, we (N5QQ/W5WW) should have Dave Leeson's 2
> elem 40m MOXON up and running. Will offer our comments afterwards. K5MR got
> his up a few months back and seems to be pleased, well, until the lightning
> storm fried his rotor!
>
> More later...
>
> Ron
> N5QQ
>
>
>  On 10/17/07, David Gilbert <xdavid at cis-broadband.com> wrote:
> >
> >
> >
> > Force 12's own website says their more recent coil-loaded Delta 240 is
> > intended to replace the older linear loaded EF-240S, their explanation
> > being:
> >
> > "The most difficult aspect of the antenna was tuning the elements to the
> > proper frequencies for maximum performance.  This is because the linear
> > loading had variances during assembly."    see
> > http://force12inc.com/F12-Delta-240-140-Info-1.htm
> >
> > Several reviews on eHam.net additionally report problems with the stiff
> > Alum-O-Weld loading wires/**/ breaking, so I suspect that also had some
> > impact on F12's decision to create the Delta 240.  In theory, the Delta
> > 240 is similar to the OptiBeam OB2-40 (the choice I made as well), but
> > the Delta 240 elements are a bit shorter and I'm sure the OptiBeam is
> > more ruggedly built.
> >
> > Dave   AB7E
> >
> >
> >
> > john at kk9a.com wrote:
> > > I'm not sure that linear loading is as efficient as some manufactures
> > claim
> > > and some models require a lot of adjusting of the linear loading wires
> > for
> > > the antenna to perform properly.  I personally prefer a loading coil
> > and
> > > when looking for a small 2el beam for P40A, I choose the OptiBeam
> > OB2-40.
> > > The coils are massive, the antenna is well constructed and easy to put
> >
> > > together.   My second choice (actually first choice if budget ruled
> > out the
> > > OptiBeam) would be the Cushcraft XM240.
> > >
> > > John KK9A
> > >
> > >
> > >
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> >
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