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#3
September 24th 09, 09:04 PM
posted to rec.radio.amateur.antenna
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HELP WITH LADDER LINE CALCULATIONS.
Owen Duffy wrote in
: .... Firstly, the formulae on the Wiki page that use the log term are approximations of the function using the cosh term, and the approximation is poor for small S/d. Have a look at the calculator at http://www.vk1od.net/calc/tl/twllc.htm , it uses the cosh term in its calcs. BTW, the metric equivalent of your example is 2mm wires spaced 150mm. cosh above should be acosh! Owen |
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