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Originally Posted by wrzwaldo
Yes the older dish is round. I would use that just for simplicity in focusing it and it should still give great gain with the proper element.
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Build it just like the Primestar dish. The Dish 500 is designed so a satellite off to the right of center focuses out to the left of center after it bounces off the dish. Satellite to the left of center, goes to the right. Guess what happens to the signal from the bird that is dead center?
Bingo! Goes straight out. The focus is not quite as sharp as a true parabolic, due to the "spherical-ness" of the curve introduced to make it a multi-focal dish.
A bit more:
The dish 500s' have a 'skew' adjustment so the apparent (at least to us on the ground located North or South of the equator,) geosync arc can be compensated for. The dish is actually rotated slightly because the sat at 119 is slightly lower to the horizon than the one at 121. (Where I live. The skew offset will be different for folks in the other parts of the country. Your mileage will vary.)