ARRL

Forum Home - Rules - Help - Login - Forgot Password
Members can access, post and reply to the forums below. Before you do, please first read the RULES.

how to evaluate your antenna tuner QST04/95

Jul 8th, 20:08

DJ8UL

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
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
Jul 10th, 13:45

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
The author explains what he did in the appendix--instead of using exact equations, he is using a geometric mean of two different measurements to come up with a result that is pretty accurate.

Zack Lau W1VT

Back to Top