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Old May 1st 06, 01:21 AM posted to rec.radio.amateur.antenna
Richard Clark
 
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Default Insulation diameter vs Impedance OR how to get 20dBi out of a short Dipole

On Sun, 30 Apr 2006 21:11:57 GMT, "Tom Donaly"
wrote:

try titanium dioxide next time. As long as you're looking
for absurdist solutions it should work even better than water.


Hi Tom,

For those who don't know, titanium dioxide's dielectric constant runs
about 110.

If I wanted to be truly absurd, I would have done it with Hydrocyanic
Acid (DC of 158), or less aggressively with 35% Hydrogen Peroxide
(121), or back to the acids with Sulfuric Acid (100).

As far as being absurd, yes, this does qualify in spades. However, I
found I could reduce the size of a 40M antenna to nearly half by
surrounding the entire radiator with a water jacket only 40cM thick.
It has a good match, and loses roughly a quarter dB to the full size
antenna. It remains to be seen if this is just another aberration, or
is an actual solution.

73's
Richard Clark, KB7QHC
 
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