archive: Re: SETI Helix antenna formulas-
Re: SETI Helix antenna formulas-
MarcusJohn@aol.com
Sun, 20 Sep 1998 22:02:04 EDT
In a message dated 9/20/98 5:57:42 PM Eastern Daylight Time,
n6tx@setileague.org writes:
> >Yes, but when I change it to degrees, I still get about 1 degree or
> something
> >too low. My formula must be faulty.
>
> This does not follow. You said you got a .15 beamwidth. If this is indeed
> in radians, that translates to about 8 1/2 degrees (which is credible).
I am sorry Paul.
I dropped a decimal point.
My spreadsheet, and the website quoted, gives .015 degrees as the HPBW. Even
if I assumed the Radians as an error, I still get 0.8 degree, which is not
credible. I am off by an order of magnitude, so there is some major error
here. I have the email from Ed Larson with his formulas, and I'm going to
compare his formulas to my spread sheet to see were my error is.
Thanks.
John Marcus.
KE3SW.