archive: Re: SETI Helix antenna formulas-

Re: SETI Helix antenna formulas-

MarcusJohn@aol.com
Sun, 20 Sep 1998 17:45:49 EDT

In a message dated 9/20/98 5:14:26 PM Eastern Daylight Time,
n6tx@setileague.org writes:

>
> >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 *radian

Yes, but when I change it to degrees, I still get about 1 degree or something
too low. My formula must be faulty.

Thanks,
John
KE3SW