turntable antenna

for my project i have 2 design and construct a antenna turntable to take radiation pattern. u can get more details bout wat is a turntable by visiting this website..
http://www.sherline.com/3700pg.htm

anyone noe any other journals or website which can help me to get more information about turntable...if u have information...please share...tanx a lot

It may help you
http://www.rubiconsd.com/Pdf-files/rt6.pdf

it did...thank you