OOPS!
Sorry for being too brief.
Retuning the trap improved the SWR in the lower part of the band.
It did nothing for the pattern.
de Tom N4KG
de
On Tue, 19 Oct 1999 16:26:11 -0700 Eric Gustafson <n7cl@mmsi.com> writes:
>
> Hi Tom,
>
> I'm a little confused by this. Did changing the resonance point
> of the driven element trap fix the F/B problem? It really
> shouldn't unless the element is really not even close to
> resonance in the band.
>
> 73, Eric N7CL
>
>
>
> >From: n4kg@juno.com
To: <towertalk@contesting.com>
> >Date: Mon, 18 Oct 1999 21:57:59 -0600
> >
> >Hi Greg,
> >
> >We had a Telrex tribander at the Univ of Mich Club W8UM.
> >
> >It had almost no F/B on 10M and we found the driven element trap
> >resonant very high in the band. We retuned the traps using
> >insulated wires connected at each end and taped together forming
> >a parallel capacitor.
> >
> >If you have some modeling software, check your reflector and
> >director dimensions and see where they resonate.
> >
> >73 / GL, Tom N4KG
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