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Based on the comments I read from this thread and some of the experiments wejones has done, I became skeptical of the angle readout scale on the offset dish. For reference, I am installing a FortecStar FC90U.
I mounted a pole through the dish U-bolt mount and measured the angle using an adjustable set-square (a handy tool to measure angles like the protractor). If I make the pole parallel to the LNB arm, where it attaches to the back of the dish, I read about 20 degrees on the *dish's* readout scale. I then angled the pole to have a readout of Zero on the *dish's* scale. At this point my adjustable *set-square* reads 17 Degrees. Neither of these measurements seem to correlate with the 24.62 Degrees specified by the manufacturer. Does the LNB arm and holder angle make the offset angle verification not possible by simple means? Ideally I would like to use my adjustable set square, as it has 0.5 degree resolution -- but, for that to work, it is necessary to understand the offset angle concept and how the dish manufacturer has established the 0 degree mark on the readout scale
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