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DJ8UL

Joined: Sat, Apr 4th 1998, 00:00 Roles: N/A Moderates: N/A

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how to evaluate your antenna tuner QST04/95 Jul 8th, 20:08 2 202 on 10/7/14

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how to evaluate your antenna tuner QST04/95 DJ8UL on 8/7/14
in this very interesting article about measurement of loss in ant Tuners I do not understand how (Eq 1) on page 32 can be derived.
The estimated loss in dB = 5 log ( (S1 +1)(S2+1)/9(S1-1)(S2-1))

Can anyone explain to me how this equation can be derived and under what boundary conditions?
thanks, Hans DJ8UL

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