[Towertalk] Need Antenna Advice!

[Richard M. Gillingham]

Hi Steve.  I have the steppir, but I'm clueless about modelling 
antennas.  Only one question.  Did you do the 6 M model for 3 or 4 
elements.  The optimum Steppir configuration is for 4 elements using the 
180 degree setting. I'm told the stationary parasytic is better spaced 
in this configuration...  Try it and let us know the results.  (or maybe 
you already did?)

Always willing to learn.
Gil, W1RG


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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>_______________________________________________
>Self Supporting Towers, Wireless Weather Stations, see web site: http://www.mscomputer.com
>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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