[amsat-bb] Re: 10' Dish available
ko6th_greg at hotmail.com
Mon Oct 16 20:17:18 PDT 2006
How does one build a feed to properly illuminate a pizza slice-shaped
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 that?
----Original Message Follows----
From: "Robert Bruninga" <bruninga at usna.edu>
Reply-To: bruninga at usna.edu
To: "'Jim Jerzycke'" <kq6ea at pacbell.net>, <amsat-bb at amsat.org>
Subject: [amsat-bb] Re: 10' Dish available
Date: Mon, 16 Oct 2006 11:50:32 -0400
I stumbled on that idea when the boss ordered me to the roof to
clean up the old dishes (lost two due to huirricane damage) and
I noticed that one had only a single quadrant that was intact...
Bingo... Couldn't throw it away! Had to think of a use for
> -----Original Message-----
> From: Jim Jerzycke [mailto:kq6ea at pacbell.net]
> Sent: Monday, October 16, 2006 10:50 AM
> To: bruninga at usna.edu; amsat-bb at amsat.org
> Subject: Re: [amsat-bb] Re: 10' Dish available
> Bob, Your creativity *never* ceases to amaze me!
> 73, Jim KQ6EA
> --- Robert Bruninga <bruninga at usna.edu> wrote:
> > > Wow, Gunther! That is a lot of antenna. How are
> > you going
> > > point that monster?
> > > Remember, once you can hear the noise floor of the
> > transponder, then
> > > additional gain is, well, not needed very much,
> > let's say
> > (HI).
> > >
> > > >With the coming of the next group of HEO
> > satellites I am
> > > >checking if there is any interest in a 10'
> > Weingard mesh
> > dish.
> > Having collected old 10' dishes myself (with no
> > practical
> > applications), I can add these comments too:
> > 1) The dish is "overkill" for the simple reason,
> > that AMSAT
> > would not be designing any transpondrs that would
> > "require" that
> > kind of gain, otherwise very few people could use
> > the satellite.
> > SO AMSAT designs for smaller more practical size
> > dishes, lets
> > say up to 1 meter or maybe 4 feet or so in size.
> > 2) But this means that the 10' dish can uaually be
> > broken up
> > into 4 quadrants and 4 reasonable sized amateur
> > radio dishs can
> > result. Being 1/4th the size and 1/4th the mass, it
> > is easier
> > to build a mount and tracking system. And the
> > quadrant will
> > work just as well as any other approximate 1 meter
> > antenna with
> > the proper feed.
> > See my web page (near the bottom) on the subject:
> > http://www.ew.usna.edu/~bruninga/amsat-ideas.html
> > Bob, WB4APR
> > _______________________________________________
> > Sent via AMSAT-BB at amsat.org. Opinions expressed are
> > those of the author.
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