Your statement that the SteppIR antenna
is a "no compromise" antenna ignores the
fact that the ELECTRICAL spacing is
DIFFERENT for EACH BAND. How can
that be OPTIMUM? THAT is the compromise
in the SteppIR design.
Tom N4KG
On Sat, 14 Sep 2002 ROBKEL@aol.com writes:
> In a message dated 09/14/2002 11:06:31 AM Central Daylight Time,
> towertalk-request@contesting.com writes:
>
> > Question for a SteppIR owner: where exactly is
> > the DE placed on the boom?
>
> I own one. It is not yet up, but the latest instruction book says:
>
> Director - Driven = 89.5 "
> Driven - Reflector = 102.5"
>
> I think the SteppIR is a BIG step in the right direction. As far as
> tuning
> goes, it is a no commpromise design. You can have a resonant antenna
> on any
> band with good to excellent directivity and gain, with a modest
> weight and
> windload, and minimum fuss puttting it up. This speaks volumes to
> all of us
> with small portions of real estate.
> The small improvement in F/B for a variable boom length would seem
> not
> worthwhile to me. For the purist, I would opt for using a second
> SteppIR,
> above the first, and use a different boom length. No interaction
> problem
> (IMO) since you could set the unused one to 6m or higher.
> I do plan to investigate using a 2nd 2EL unit with center loading
> coils on
> 40M. It should be tunable over the full band with the proper choice
> of coil.
> I have yet to model it (too many Honey do's).
> A variable boom length would be a real mechanical challenge compared
> to the
> relative simplicity of the element tuning. (That said, the concept
> of two
> rack & pinions, stacked and constrained in some manner......or maybe
> two
> garage door tracks.....who knows???)
> Bob, W5LT
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