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[Towertalk] Need Antenna Advice!

To: <towertalk@contesting.com>
Subject: [Towertalk] Need Antenna Advice!
From: stevek@jmr.com (Steve Katz)
Date: Fri, 20 Sep 2002 07:35:15 -0700
Hi Joe,

In the latest QST ad, which I just saw for the first time, the data appears
very believable.  

Their on-line data sheet (last I looked, a week or so ago) states "20 to 50
dB" F/B on all bands, 14 through 54 MHz.

73,

Steve WB2WIK/6

"If everything seems under control, you're just not going fast enough." -
Mario Andretti

> -----Original Message-----
> From: Joe Reisert [SMTP:jreisert@jlc.net]
> Sent: Thursday, September 19, 2002 4:02 PM
> To:   Steve Katz; 'Mark Beckwith'; towertalk@contesting.com
> Subject:      RE: [Towertalk] Need Antenna Advice!
> 
> 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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> an 
> >additional 5 percent off
> >any weather station price.
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