For those who want better F/B on 10M with the SteppIR
3L Yagi, a separate 10M reflector could also be added
which I expect would not degrade performance on the
lower bands. That is a common practice on other tribanders
(A4S, TH6, TH7, etc).
Tom N4KG
On Thu, 19 Sep 2002 Joe Reisert <jreisert@jlc.net> writes:
> Steve,
>
> I didn't look at the Fludid Motion specs. but I know the antenna is
> not
> optimum on 6 meters and I doubt they make that claim. If you check
> the
> literature, you will see that they have an optional add on reflector
> and
> director for 6 meters to enhance performance on that band.
>
> Joe, W1JR
>
>
> At 03:39 PM 9/13/2002 -0700, Steve Katz wrote:
>
>
>
> > > >The StepIR is an optimized 3L beam AT
> > > >ALL FREQUENCIES.
> > >
> > > That depends on how you define the word "optimized," eh? I
> don't call
> > > fixed
> > > element locations on the boom optimized on more than one band.
> > >
> > > Mark, N5OT
> > >
> > [Steve Katz] Mark, I have to agree. Unless this antenna
> defies all
> >the modeling programs, using a 16' boom and fixed element locations
> provided
> >in the SteppIR manual, and modeling using NEC, if I adjust the
> element
> >lengths in 1" increments indefinitely, to try every combination of
> element
> >lengths there is from 10" to 432" per element using (N+1...)
> algorithms, I
> >cannot come up with any combination that provides more than about
> 6dB F/B on
> >six meters, for example. The original claims for F/B on "all
> bands" is
> >"20-50 dB, depending on frequency" for the 3L model, but I can't
> use any
> >modeling integers that indicate that, at any element lengths or any
> height
> >above ground. If the inventor/manufacturer can provide us with
> some new
> >data on this matter, I'd love to receive it! Better still, I'd
> like to
> >know what the exact element lengths are to provide max F/B on each
> band,
> >based on the 16' boom length and fixed element spacing. Then I can
> scale it
> >1:10 and stick the model in our RF anechoic chamber here at the
> lab, and
> >take actual (empirical) data. I'll be happy to provide the test
> report in
> >this forum, if I can get the data to make the model. -WB2WIK/6
> >
> >
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> _______________________________________________
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