A couple of additional "power" signs appeared when I cut & pasted that
formula from my web site into my email client. It should be:
R = (100.cos(θ).10 ^(- |S21| / 20) ) - 100
Thanks to Maximo for pointing it out.
It's exactly the same formula as Rick's for his special case of a
resistive DUT, but with the addition of a cos(θ) term.
Steve G3TXQ
On 14/01/2018 13:19, Steve Hunt wrote:
The general case is simpler than I originally had it, because I'd
missed a simplification using a trig identity. The revised version is
here:
http://www.karinya.net/g3txq/chokes/s21.pdf
R = (100.cos(θ).10 ^(- ^|S21| / ^20) ) - 100
X = (R+100).tan (θ)
Steve G3TXQ
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