Re: [TowerTalk] Multiband antenna with non-resonant trap

[Roger D Johnson <n1rj@roadrunner.com>]

Reg, G4FGQ, has a program to do this on his website. Look for:

NOTATRAP

73, Roger


Tod Olson wrote:
> I have some concerns about this article. I had gone through it several times
> and tried to contact Yardley since he and I had spoken about other thing
> before. Regrettably, he had reached the point where he was unable to
> communicate and shortly afterward died.
>
> If anyone has time to check the equations and verify that they are correct,
> I for one would like to be advised. It would be nice to know that one can
> really use the method to get useful antennas. As I recall, he selected a
> 'geometric mean' frequency for the resonant point and then designed traps
> that would respond to the reactance at the desired frequency.
>
> Tod, K0TO
>
>  
>
> On 5/26/13 1:50 PM, "Bob W5RN" <rj.newton.w5rn@verizon.net> wrote:
>
>   
> > It was Ham Radio
> >
> >      Designing Trap Antennas: A New Approach
> >      Yardly Beers W0JF
> >      Ham Radio, Aug. 1987, Vol. 20, #8, P. 60
> >
> > I have the issue someplace but could not put my hands on it. Just found it!
> >
> > If you need a copy, I can scan and send it.
> >
> > Bob Newton W5RN
> >
> > On 5/25/2013 9:36 PM, Hans Hammarquist wrote:
> >     
> > >  This might be the wrong forum but does anyone remember an article in QST (or
> > > maybe QEX) of how to make multibands antennas using LC traps where the traps
> > > resonance frequency is not at the operating frequencies. By putting an LC
> > > circuit somewhere in or close to the center of a vertical you get two
> > > resonances, one where the C-part act and increase the resonance and one where
> > > the L-part decreases the resonance frequency.
> > >
> > >
> > >  Anyone?
> > >
> > >
> > >  73 de,
> > >
> > >
> > >  Hans - N2JFS
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