Topband: Antenna question

[Tim Duffy K3LR]

A paper concerning this antenna will be presented at the Dayton Hamvention
Antenna forum in 2 weeks by Dr. James Breakall, WA3FET, one of the inventors. He
will also discuss how to use these antennas in classic 4 square low band
designs.

73,
Tim K3LR


John Kaufmann wrote:

> Maurizio Panicara [mailto:i4jmy at iol.it] wrote:
>
> > Did anyone tried anything like this but scaled on 160m ?
>
> > http://www.star-h.com/publications/ieee2002.pdf
>
> Yes, I have been using a system somewhat similar to this for nearly 20 years
> on 160.  In my case the array consists of three verticals, each about 0.1
> wavelengths tall, in a triangular configuration with spacing of about 10m.
> Each vertical uses a combination of top loading and bottom loading.  Each
> vertical by itself has a feedpoint resistance (both predicted by modeling
> and confirmed by measurement) of about 5 ohms.  In the array, the resistance
> increases to 15 ohms, exactly as this article predicts.
>
> I think the main advantages of this approach are purely practical
> ones--reduced height and easier impedance matching because of the higher
> feedpoint resistance.  I use a simple L-network at the junction of the
> feedlines.  Theoretically, with zero loss, there is no real performance
> advantage for this system over any short vertical system that also has zero
> loss.
>
> 73, John W1FV
>
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