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Re: Careful with a re-design

Posted by Ron Oehlert (A) on December 12, 2006 at 00:35:26

In Reply to: Good stuff- posted by cdb on December 11, 2006 at 20:20:43:

Be aware that element diameter vs element length is critical per frequency & feed impedance. Construction with tubing vs wire will neccesitate shortening the length & make 300-ohm twin-lead not an ideal feed line. Consult an ARRL Antenna Manual for particulars & math formulae. And insulated wire was specified for construction because the overlaping loops must not short to each other. When constructed of non-insulated material, the air gap required between adjacent loops may alter the feed point impedance whereas 300-ohm twin-lead is no longer a good match, causing a loss of gain. The animated drawing is for clarity, it is not to scale.

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