Re: [amsat-bb] DISH BEAM WIDTH

[Gene Marcus <mmarcus@xxxxxxxxxx>]

Bill,

This link may help you:

http://home.hiwaay.net/~mmarcus/download/Dish_Design.xls

73,

Gene Marcus W3PM GM4YRE




At 12:24 AM 3/1/2003 -0500, walnuthil@juno.com wrote:

 >Hello All,
 >I recently acquired a TVRO 12 foot dish, with the mesh
 >reflector. I have been trying to calculate the 3db beam width
 >in degrees, the books I have are not clear on the formula.
 >Does anyone have the correct math formula ?
 >Putting a 2 by across the dish and measuring down the
 >center is 22 inches. Yields a f/D = 4.0 if the formula is right.
 >I plan on using it for receive on AO-40, I have some tall pine
 >trees to the south that reduce the down link signal.
 >Hopefully this dish will help.
 >Thanks in advance
 >Bill


 >WA1DMV@amsat.org
 >#20942

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