[TowerTalk] 2 el 40m beams

[George Dubovsky]

I believe that the Telrex 40s were less than full length elements - that is
certainly true for the 40M329 (29 ft boom) and the 40M335. I have one of
each in the barn, and they both have shortened elements and a loading stub
for each element running along the boom. I have analyzed the elements using
the formulas/spreadsheet in Leeson's book "Physical Design of Yagi
Antennas" and the results convinced me to *NOT* put them in the air in
their original configuration - they just aren't very robust mechanically.

They may yet be built into something useful, but I think that the anecdotal
evidence of their original shortcomings is right on the money.

73,

geo - n4ua

On Thu, May 24, 2012 at 6:21 PM, David Gilbert <xdavid at cis-broadband.com>wrote:

>
>
> I think that comment is an anachronism.  The Telrex was a beefy antenna,
> but with full size elements I don't see how it could be as mechanically
> robust as a modern day coil-loaded shorty-40.  Just too much weight and
> leverage up there for the Telrex, and a properly designed shorty-40 will
> not suffer very much in performance relative to a full size antenna.
>
> Dave   AB7E
>
>
>
> On 5/24/2012 1:46 PM, n8de at thepoint.net wrote:
> > Put up a Telrex if you want the strongest mechanically.
> >
> > Don
> > N8DE
> >
> >
> > Quoting lkeller73 at roadrunner.com:
> >
> >> Hello out there.
> >>
> >> I'm at a loss as to what to replace a snow-damaged 2 el 40m beam with.
> >>
> >> Everything I've found on-line doesn't really call out how strong the
> >>   antenna is.
> >>
> >> Ideally, since most "gain" figures would be nebulous anyway, I want
> >> the STRONGEST beam
> >> out there since it's going on Bertha at 100 feet.
> >>
> >> Any suggestions?
> >>
> >> Lonnie
> >> WA2AOG/W2RR
> >>
> >>
> >>
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