I bought this prime focus dish second hand earlier this year and am in the process of converting it for a ku band feed. I've now measured this dish several times and have come up with figures that seem "impossible". Its 219.2 cm across but only 24.25 cm in depth. THis gives an f/d ratio of 0.56 which as you are going to tell me is consistent with an off focus dish. When I bought it it was described as a test model. I can assure you that the measurements are correct; does the fact that this dish has very little depth mean that it will be less efficient than " normal" prime focus dishes ?
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