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Re: LF: Top load coil at ground level?

To: <[email protected]>
Subject: Re: LF: Top load coil at ground level?
From: "Peter Martinez" <[email protected]>
Date: Wed, 19 Apr 2006 19:00:54 -0000
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From G3PLX:

Effectively what Dick is suggesting is having the coil physically at the bottom where it can be housed and adjusted, but electrically at the top. This is done by extending two wires down the antenna such that the currents in these two wires are equal and opposite and they therefore make no contribution (or degradation) of the antenna performance. If the antenna is electrically short anyway, it doesn't help to say this is a stub with a specific electrical length, it's just a coil connected into it's place with a pair of wires.

If the antenna was hollow, or like a lattice tower, the wire from the top hat could come down to the bottom inside the structure, so long as it didn't arc across!

73
Peter



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