Re: Towers as 75m verticals

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Posted by:  hank k8dd

Posted On:  12/10/06

Subject:  Re: Towers as 75m verticals

Message Posted:
    In Reply to: Towers as 75m verticals posted by Nils/W8IJN on 12/10/06

Using "shunt fed towers" in google here are some sites to try .....
http://www.qsl.net/w9rb/webdoc9.htm
http://lists.contesting.com/_antennaware/2002-12/msg00015.html
www.papays.com/rag0405.pdf

K5DKZ's blog says (and I agree with him completely) The best and most complete source of information on shunt feeding a tower is the ON4UN’s book, Low Band DXing. It contains a wealth of information, several shunt feed matching methods, and verifies that a vertical needs to be at least an electrical quarter wave in length at the lowest frequency being used.

For the matching cap you're going to want either a vaccuum variable, a big ole bread slicer variable cap or a box full of doorknob caps - some real high voltage ratings. Even at 100 watts there are some tremendous voltages created at the feed point.

72 73 Hank K8DD


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