[Towertalk] Need Antenna Advice!

[Joe Reisert]

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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