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LF: Re: Vertical grounded tower for LF antenna.

To: [email protected]
Subject: LF: Re: Vertical grounded tower for LF antenna.
From: "Johan Bodin" <[email protected]>
Date: Tue, 12 Feb 2002 21:46:07 +0100
References: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Hi All

Giulio Scaroni wrote:
But wich may be the best sistem on this tower for LF, is possible to feed 
directly it, may be at the top?
Oh.. I wish I had such a tower!

One idea is to make a top hat of wires fanning out radially from the top of the tower, sloping as little as possible. Feed the antenna between the top hat
and the top of the tower - the current running down the tower will create the
"vertical ampere-meters" that radiate.

Assuming the tower is well grounded, put a loading coil between the tower
top and the topload "umbrella". Feed via coax to a link winding on the "cold"
side of the loading coil. An alternative to link coupling is to put a matching
transformer between the cold end of the coil and the top of the tower. The
coax feeds the primary winding. A remotely controlled variometer up there
will do wonders.

73 de Johan (Giovanni) SM6LKM




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