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vertical antenna loading coil vs toroid

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March 28th 09, 07:00 PM posted to rec.radio.amateur.antenna

[email protected] jimp@specsol.spam.sux.com is offline

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vertical antenna loading coil vs toroid

wrote:
I am doing some design with vertical antennas for the low bands
40/80/160M. I require a somewhat large reactance on the element to
help load it on 160M, (40&80M) are working somewhat satisfactory now
with the design i am using. The required reactance that i need and the
size it would be using a coil (with the materials that i have right
now) may not last a winter storm in VO1 land when loaded with ice or
snow in 90km/h wind, so my question is, has anyone had experience
using a toroid wound with the correct amount of reactance installed
on the element to to achieve resonance instead of a coil and how it
has been for them.

I have something simular and used a FT-240-61 torroid which I happened
to have to build a tapped inductor with a pair of relays to switch it
in/out for 80/160.

The antenna analyzer and radio say it seems to work OK.

Just be sure to pick a material appropriate for an inductor at those
frequencies and a size appropriate for the power you intend to run.

--
Jim Pennino

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