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Helix dish feed questions

I have a 750mm radar dish 125mm deep. I come up with F/D of .375 and
would like to feed it with a 2.4GHZ helix similar to the G3RUH design
on the AMSAT website (a116.zip). James used 2 1/4 turns to feed a
deeper dish (.33 or so). I cannot find a reference to the correct
number of turns to feed this .375 dish with. Anyone know/have a
pointer? Thanks!!
Eddie Seymour, WB4MLE
E-Mail wb4mle@mindspring.com
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