The SteppIR can obviously be adjusted to make a beam pattern over an octave
or more, and to create a good match to its feedline, by infinitely varying
all the element length combinations; but it will never be optimized on more
than one band because of the fixed element spacing.
-------------------------------------------
Steve,
Why should one not realize a boom with mobil elements.
Its not impossible, just find a good team totake up the challenge.
After all radio amateur activity is not only commercial business, pseudo
chicken band.
What say !
Jos on4kj
> Can't comment on SteppIR wind/WX survivability, etc, since I don't think
any
> have been up long enough yet. In a few years, we'll know more on that
one!
>
> -WB2WIK/6
>
> "If everything seems under control, you're just not going fast enough." -
> Mario Andretti
>
> > -----Original Message-----
> > From: Jim Shaw [SMTP:Jim@shawresources.com]
> > Sent: Thursday, November 14, 2002 8:52 AM
> > To: Jon Ogden; Dino Darling; towertalk@contesting.com
> > Subject: RE: [Towertalk] LPDAs...
> >
> > QUESTION: Instead of an LPDA, why not use a 3 element SteppIR antenna?
> > Don't they cover all frequencies continuously from 13.9 to 30 MHz?
Isn't
> > that similar to the design goal of an LPDA? Seems like a SteppIR should
> > easily cover MARS frequencies in that range. Just asking cause I have
no
> > first hand experience with either and LPDA or a SteppIR.
> >
> >
> > 73 de Jim WA6PX
> > JGShaw@Alumni.HAAS.org
> >
> > -----Original Message-----
> > From: towertalk-admin@contesting.com
> > [mailto:towertalk-admin@contesting.com]On Behalf Of Jon Ogden
> > Sent: Thursday, November 14, 2002 6:41 AM
> > To: Dino Darling; towertalk@contesting.com
> > Subject: Re: [Towertalk] LPDAs...
> >
> >
> > on 11/14/02 12:17 AM, Dino Darling at k6rix@arrl.net wrote:
> >
> > > I learned more about LPDA's from this article than anything I've read
to
> > > date! I will have to re-read the article myself, but I remember talk
> > about
> > > front-to-back figures that were BETTER than a small yagi.
> >
> > I could believe they have better F/B than a small Yagi. I also believe
> > that
> > a good sized LPDA would outperform a small beam. However, I am not
> > completely sold on the idea of absolutely better performance.
> >
> > I'll have to look into it since I am currently perusing what sort of
> > antenna
> > to get to replace my TA-33.
> >
> > 73,
> >
> > Jon
> > NA9D
> >
> > -------------------------------------
> > Jon Ogden
> > NA9D (ex: KE9NA)
> >
> > Citizen of the People's Democratic Republik of Illinois
> >
> > Life Member: ARRL, NRA
> > Member: AMSAT, DXCC
> >
> > http://www.qsl.net/na9d
> >
> > "A life lived in fear is a life half lived."
> >
> >
> > _______________________________________________
> > AN Wireless Self Supporting Towers at discounted prices,
> > See http://www.mscomputer.com
> >
> > Wireless Weather Stations now $349.95. Call Toll Free,
> > 888-333-9041 for additional information.
> > _______________________________________________
> > Towertalk mailing list
> > Towertalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> > _______________________________________________
> > AN Wireless Self Supporting Towers at discounted prices,
> > See http://www.mscomputer.com
> >
> > Wireless Weather Stations now $349.95. Call Toll Free,
> > 888-333-9041 for additional information.
> > _______________________________________________
> > Towertalk mailing list
> > Towertalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> _______________________________________________
> AN Wireless Self Supporting Towers at discounted prices,
> See http://www.mscomputer.com
>
> Wireless Weather Stations now $349.95. Call Toll Free,
> 888-333-9041 for additional information.
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
|