Quote:
Originally Posted by Ski5010
Could someone help me figure out the depth i need to set my corotorII in my 10 foot unimesh dish please.Ive never been good in math Thank you in advance
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I'm not sure if you're asking what the focal length of your dish is, or if you know the focal length and need to know where to put the Corotor relative to the focal length.
If you know the focal length, then if I remember right, the corotor should be positioned such that the focal point is something like 1/4 inch inside the throat of the feedhorn.
If you don't know the focal length, there are a bunch of calculators out there, but to use the calculators, you need to know two things, the diameter of the dish (approximately 10 feet in your case), and the depth of the dish. The depth of the dish is basically how deep the center of the dish is below the plane described by the rim. Ie if you place a 10' straight-edge across the dish, measure the distance from the straight-edge to the center. What I did, was tape a yard stick from the feedhorn to the center of the dish, then got down from the ladder and sighted along from one edge of the dish to the other and read the depth on the yard stick, then used a regular tape measure to measure the diameter.
_OR_ if you happen to know the F/D ratio for your dish, you can easily get the focal length.
If you give us the measurements, we can tell you the focal length.
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