Try it Tom and see for yourself.
On 10M I can tune to a strong station, flip the beam 180° and, in most
cases, lose the station in the mud (noise-level). Theory and modeling are
great, but real-life experiences sometimes differ.
A few of us have ventured into the 'unknown' and have been delighted at the
results.
The next step in this innovative design will be a longer boom and more
elements and, of course, at a much higher cost.
However, to see your beam being tuned to the exact operating frequency as
you tune your transceiver, with a VSWR of 1.1 : 1.0 and then being answered
by the other station, in a pile-up, usually on the first or second call,
with your linear sitting there cold and unused, feeling totally left out, is
exhilarating, at least to me.
Being the only one in Canada with one, feels pretty good also, even though
this particular uniqueness won't be long lasting.
Try one, you will like it!
73, Carl VE9OV
----- Original Message -----
From: <n4kg@juno.com>
To: <TOWERTALK@contesting.com>
Sent: Saturday, September 14, 2002 4:51 AM
Subject: Re: [Towertalk] Need Antenna Advice!
> The SteppIR 3L Yagi has a 16 ft boom.
>
> This corresponds to 0.46 WL on 10M,
> 0.34 WL on 15M,
> 0.23 WL on 20M.
>
> The W2PV Yagi Design Book shows
> gain and F/B curves for 3L Yagi's with
> boom lengths from 0.1 to 1.0+? WL
> and parasitic element tunings offset
> by 2,3,4,5,6,7 percent.
>
> Bottom Line: Boom lengths around 0.25 WL
> (and odd multiples) exhibit HIGH F/B ratios
> but lower gain (-1 dB), Boom Lengths around
> 0.5 WL exhibit LOW F/B ratios and high gain,
> and boom lengths around 0.35 WL are a good
> compromise between gain and F/B.
>
> The SteppIR can be optimized for each band
> given it's FIXED boomlength, but remember that
> for full optimization ALL parameters (including
> Boomlength) must be varied. This is NOT the
> case with the SteppIR antenna. On 20M, it's
> F/B can be made to be near optimum. On 15M,
> it can achieve good gain and intermediate F/B,
> on 10M it can achieve good gain but LOW F/B
> as originally stated.
>
> Tom N4KG
>
> On Fri, 13 Sep 2002 K7LXC@aol.com writes:
> > In a message dated 9/13/02 11:07:48 AM Pacific Daylight Time,
> > stevek@jmr.com
> > writes:
> >
> > > You might consider how important F/B is to you...the TH11 is
> > excellent on
> > > all bands; the StepIR is good on 20m and degrades on the higher
> > bands..
> >
> > I think it's the other way around. The StepIR is an optimized 3L
> > beam AT
> > ALL FREQUENCIES.
> >
> > Cheers,
> > Steve K7LXC
> > TOWER TECH
> > _______________________________________________
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> >
>
>
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> _______________________________________________
> Self Supporting Towers, Wireless Weather Stations, see web site:
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> Call 888-333-9041 to place your order, mention you saw this ad and take an
additional 5 percent off
> any weather station price.
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