LF: Care and feeding of a top-loaded vertical]
Tue, 9 Mar 1999 17:15:06 +0000 (GMT)
This looks very viable for small space. Anyone want to try it? I think
I can help out. I want to know more about how it measures out and works.
On Tue, 9 Mar 1999, Andre' Kesteloot wrote:
> Toni Baertschi wrote:
> > from HB9ASB
> > Hello Bob,
> > I'm using a helical vertical for more than a year and it works fine.
> > The lower part (7m) is a PVC irrigation pipe (11cm Diameter) the upper
> > part a Kevlar fishing pole (8m). I've wound about 350m of Liz wire on
> > it. Top load is a 60m long wire going up to 18m and then down to 8m,
> > zigzag over my 30*40m property. Self resonance of the whole thing is
> > around 170 kHz and I match it to the coax via an autotransformer (abt.
> > 1mH), wound on a plastic waste-paper basket.
> > For comparison I've built exactly the same antenna a few meters away but
> > with a straight wire instead of the helical. The helical was always 3 or
> > more dB's better, on transmit and on reception.
> > I think the helical is good for some more dB's if you can make the
> > diameter larger (a handling problem, hi).
> > 73 de Toni
> > Bob RIESE schrieb:
> > >
> > > Has anyone done anything with a continuously loaded vertical and top hat.
> > > 40 Ft of large diameter plastic pipe wound with copper wire would be a
> > > rubber duckie on LF, the only problem I see would to keep it from acting
> > > like a Tesla Coil
> > >
> > > Bob K3DJC
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