If you are really connected to the earth and the resistance of the earth is
really infinite then your efficiency is zero and it has the same effect as if
you only have a shielded wire connected to the radiator. But this is
impossible in real life, but is you install a counterpoise that is resonant at
your frequency then you may radiate well. Remember that antennas have
directivity in both azimuth and elevation. Read the ARRL Antennna Book over and
over until you understand it if you want a good antenna. Your efficiency from
your antenna connector on depends on the resistance of your counterpoise
connection, your counterpoise and the length of your radiator. You get full
credit for the radiator from the feed point to the loading coil and some
credit for the whip length but very little for the coil itself, maybe a bit
less than the coil length. Antenna installations always obey Ohm's law and the
other laws of physics whether you understand them or not. Whether you want to
believe or not! Save your desire to believe for religion, they say it works!
Willis 'Cookie' Cooke,TDXS Contest Chairman K5EWJ & Trustee N5BPS
From: Al Lorona <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Monday, July 20, 2015 11:58 AM
Subject: [Elecraft] Verticals on mountaintops
[I've re-named this thread. Was 'Miniature self-supporting HF Antennas'.]
When the ground is perfect, that's the best case for a vertical antenna. If the
ground becomes worse than ideal, then the losses increase and performance is
not as good and the pattern changes: less radiation to the horizon and higher
takeoff angle.
But then, if the ground continues to get worse -- let it become the worst case,
an insulator with zero conductivity-- don't the losses go to zero again? And
does the pattern go to more like an isotropic, or ...??? If the antenna does
look more like it's in free space, then this would support the statement that
there's radiation below the horizon from a vertical on a mountaintop.
Al W6LX
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