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[Towertalk] Re: SteppIR Element Placement

To: <>
Subject: [Towertalk] Re: SteppIR Element Placement
From: (
Date: Sat, 14 Sep 2002 21:01:45 -0600
Your statement that the SteppIR antenna 
is a "no compromise" antenna ignores the
fact that the ELECTRICAL spacing is
that be OPTIMUM?  THAT is the compromise
in the SteppIR design.

Tom  N4KG

On Sat, 14 Sep 2002 writes:
> In a message dated 09/14/2002 11:06:31 AM Central Daylight Time, 
> 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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