archive: Re: SETI Yet another hare-brained scheme for building an antenna
Re: SETI Yet another hare-brained scheme for building an antenna
Mon, 31 Aug 1998 20:03:54 EDT
On Mon, 31 Aug 1998 14:17:40 -0700 (PDT) Corey Ashford
>Picture a round, above-ground swimming pool about
>14 feet in diameter, filled about half way with water
>and floating on top of that a coating of aluminized
>In the bottom of the pool, a submersed pump gets
>the water moving around in a circle... the velocity
>of the water determines the shape of the "dish" formed
>by the water (which is parabolic).
>Above the pool, dead-center in the focus is of course
>the feedhorn and LNA.
>The ping-pong balls ought to be small enough not to
>cause much phase error at the focus at 1420 MHz.
>I suppose there'd be problems with freezing during
>perhaps some antifreeze would help out.
Once it froze up, (in the parabolic position) you could
turn off the pump and use your Ice-Dish.
(As opposed to you Dish of Ice Cream)..
I needed to read about this new antenna idea to cheer
me up after dropping 14k of my 401k today..
73, Rich <>
>Another problem is making sure that the balls maintain
>contact with one another.
>If they neighbors ask, tell'em it's abstract art :)
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