Hi Tom,
Thank you for the information, It sounds very convincing.
As you have said it is difficult to get a A-B test unless instant switching
or direct observation is available.
I was hoping for a test something like, side by side identical wires, one
insulated, and one un-insulated with voltage measuring devices at the ends.
Also separated enough not to get Beverage coupling, and using real stormy
weather measuring.
Over the insulation breakdown voltage, one would expect them to be equal
anyway.
73
Bruce-K1FZ
----- Original Message -----
From: "Tom W8JI" <w8ji@w8ji.com>
To: "Bruce" <k1fz@myfairpoint.net>; <topband@contesting.com>
Sent: Thursday, November 15, 2012 11:14 AM
Subject: Re: Topband: Covered /bare antennn wire
Out of curiosity, has anyone ever really done testing of voltage buildup
on a insulated antenna wire, VS a non-insulated wire ?
Indoor antennas VS outdoor antennas of equal size?
I tested this extensively years ago, and there was no difference at all
except if the insulation was in an area of corona discharge.
All of the noise appeared related to corona, which was a function of
exposed sharp points, and all of the charge for a floating wire was the
same insulated or not.
I discussed this with KB8MU (just recently a SK) from NASA, because he
dealt with ion propulsion and electromagnetics, and what he found on
spacecraft and aircraft agreed with my earth-based experiments.
I used an electrostatic paint gun with water, and a modified garden hose,
as the charged water source.
I also noticed no difference on real antennas. My higher antennas with
sharp points get p-static, the low antennas or antennas with blunt ends do
not. Grounding and static drains make no difference except for the popping
when a dielectric charges and arcs.
73 Tom
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Topband reflector - topband@contesting.com
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Topband reflector - topband@contesting.com
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