[TowerTalk] force 12 ef240s 40m yagi

[Pete Smith]

I wrote to N6BT back in June or thereabouts asking about the possibility of 
an EF-240S to Delta 240 conversion.  He was on his way to a hamfest just 
then, but promised me to think about it - though he noted that the Delta 
coils are at a different place on the elements than the insulator for the 
linear loading.  Anyhow, I never heard back, and follow-ups have gone 
unanswered, so who knows...?

73, Pete (whose EF-240S works just fine, thanks, except for a little 
narrowness of bandwidth)

At 05:45 PM 10/18/2007, Al Williams wrote:
>Thank you for informing about the "demise" of the EF240S.
>
>Maybe that is the reason that no one has offered to purchase my "still in
>the unopened box" EF240S which I never assembled because of purchasing the
>Steppir monstr.
>
>Has anyone converted the EF240S to the Delta 240, please contact me.
>
>PS, I still will sell the EF240S!
>Also, still have the EF320 to sell for 80% of website price.
>
>
>k7puc
>
>----- Original Message -----
>From: "David Gilbert" <xdavid at cis-broadband.com>
>Cc: <TOWERTALK at contesting.com>
>Sent: Wednesday, October 17, 2007 9:46 PM
>Subject: Re: [TowerTalk] Shorty 40
>
>
> >
> >
> > 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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