Abstract
AbtractThis paper presents as a case study the refurbishment of a parabolic dish antenna that had been optimised with a particular end use in mind to serve in another different application at a much different frequency, carried out against tight time and budgetary constraints that dictated achieving the simplest solution that could provide the required grade of service. The refurbishment involved, first, a critical evaluation of the optics of the dish and its Gregorian sub-reflector to prove the possibility of what was being sought, and then the design of a new feed system to achieve it. This revolved about the somewhat unconventional use of a plain conical horn, and involved extensions to the theory of this device to expose problems with its lack of precisely equal beamwidths in each of its principal planes and its astigmatism. Final validation of the refurbishment was carried out by measurement of the radiation diagram of the dish. Because of its size, both physically and in terms of the free space wavelength, and equipment constraints, this required the unconventional solution of using the satellite that it was being refurbished to track as a beacon by means of which to carry out the measurement. The result is to show excellent agreement between theory and practice.
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