Installing A Satellite Dish
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The f/D ratio is the focal distance of the dish (f), divided by the diameter (D). When dealing with most prime focus antennas, the quantity ought to come out between28 and42. In the event you notice, most of those numbers are additionally on scale on the facet of the feedhorn. You merely set the highest edge of the scalar ring even with the line that corresponds to your right f/D setting.
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