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The Fortec dishes are pretty famous for being off roughly 5 degrees plus or minus. Depends on the mount. The 80cm's usually need to be 5 higher than calculated and so far the 90cm's appear to be in the 5 lower range. Again this depends on the mount. The calculated values are a starting point. Simplistically dish elevation sets the shape of the arc. Flat and wide or high in the center and narrow. Motor elevation sets the location in the sky of the arc.
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8.5' Mesh Dish w/ C & Ku lnb's & 24" actuator
8.5' Mesh Dish w/ BSC621-2 fixed install for circular C Band on 40.5
Fortec Star 90cm Dish w/ FSKUv lnbf & DMSISG2100
Motorola DSR922
Fortec Mercury II
Digital Stream HD1150.
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