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Timo Stein and Christopher Forster, two young amateur astronomers in Germany, constructed a microwave radiometer that is similar to my apparatus. They used the full 1 meter TV dish antenna. This gives them a higher spatial resolution, but has the problem of spurios reflections from the framework of the dish antenna. In order to avoid this they have surrounded their antenna with a shield made of rabbit fence mesh and aluminum foil. This is visible in the photograph on the left.
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Michel Piat, a Professor at the Paris Diderot University, has also constructed a similar apparatus. To avoid scattering around the edges of the dish he adds a larger dish antenna around the smaller primary parabolic reflector. See his web page, http://www.apc.univ-paris7.fr/~piat/Michel_Piats_site/Lexperience_PW.html |