[amsat-bb] Re: 10' Dish available
w7lrd at comcast.net
Tue Oct 17 05:14:38 PDT 2006
Perhaps my helix feeds would be applicable. Usually designed for off center dishes. With fewer turns you would have a wider pattern.
73 Bob W7LRD
-------------- Original message --------------
From: "Robert Bruninga" <bruninga at usna.edu>
> > How does one build a feed to properly illuminate a pizza
> > reflector? Or is this a matter of 1/4 of a 10' dish being
> still so
> > over-kill that you only use the fat end, and under-illuminate
> Well, presumably one will be using this on S-Band either for
> 802.11 or other 2400 MHz purpose so one has to build his own
> feed anyway. Probably a dipole over a splashplate. That is
> typically a good feed for a typical .4 F/D dish? If that is so,
> then when it is used to illuminate just 1/4th of the dish area,
> then there is spillover and a few dB are lost. Maybe a good
> feed for the 1/4 quadrant dish might be a dipole over a
> splashplate with a director?
> Someone who is good on feeds might suggest the right answer
> here... But in any case, one is not trying to illuminate the
> tastey end tip of the pizza slice, but generally the center of
> the crusty end...
> De WB4APR, Bob
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