archive: Re: SETI Helix antenna formulas-

Re: SETI Helix antenna formulas-

Dr. H. Paul Shuch ( (no email) )
Sun, 20 Sep 1998 17:14:05 -0400

At 12:06 AM 9/20/98 EDT, MarcusJohn@aol.com wrote:

>I wrote a spreadsheet (xls version 4) for the helix antenna formulas from the
>website: www.mindspring.com/~nzkiwi/helix.html. The half power beam width
>doesn't make sense. It gives 0.15 degrees for the HPBW, both on the website
>and on my spreadsheet. Does anyone have the correct formula?

Is it possible your spreadsheet is computing the beamwidth in *radians?*
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H. Paul Shuch, Ph.D. Executive Director, The SETI League, Inc.
433 Liberty Street, PO Box 555, Little Ferry NJ 07643 USA
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