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September 13th 08, 04:30 AM
posted to rec.radio.amateur.antenna
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Light,Lazers and HF
On Sep 12, 12:59*am, Mark Cudworth
wrote: wrote: That is interesting. I thought the PR dish was parabolic. As a parabola, the reflected waves (or particles if you will) of a transmitter at focal point can only traverse in one direction, that is, in a direction parallel to the tangent of a line drawn at the lowest point of the parabola. If the parabolic reflector is stationary, how can transmitted waves/particles go in any direction but straight up in that perpendiculr direction? If you move the focal point as you say they do, then the antenna does not finction as parabola anymore and gain should drop drastically, agree? I am afraid I must be missing something and request your technical advice. Thanks. The Arecibo radio telescope has a spherical reflector, not parabolic. This is mentioned on the official web page: * *http://www.naic.edu/public/the_telescope.htm It also gives details on how the telescope operates. -- Mark Cudworth Thank you Mark. It truly is spherical. |
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