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Message: <blockquote data-quote="s-band" data-source="post: 972607" data-attributes="member: 407744">w1ghz has some good stuff.Somehow mine works, it wasn't based on much design time! To quote your 1st link "we just bend it until it works" I've added a pic with ruler for scale. It's not the most accurate helical and the spacing doesn't match the calculations. maybe a case of many wrongs making a right. It's a few dB from prefect circular polarisation. That's probably where the messy construction has had its effect.I haven't found a simple way to determine phase centre but,  in practice, it only needed to be within a cm or 2 when using it as a very offset feed on the PF dish.[ATTACH]93545[/ATTACH] [ATTACH]93546[/ATTACH]</blockquote>