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18" dish specs

I'm finally building my downlink for AO40 and I'm trying to figure out the
gain for a converted Dish Network dish (18" round) with a 5 1/4 turn helix
feed.  Anyone got exact figures?  Also, which way (looking out from the
feedpoint) should the helix turn, clockwise or counterclockwise? 

73 de N8AU, Jim in Raymore, MO
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