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Standing Waves (and Impedance)
On Wed, 21 Dec 2005 20:18:05 GMT, John Ferrell
wrote: On Tue, 20 Dec 2005 03:41:41 GMT, "W. Watson" wrote: I'm trying to make some sense out of why the emphasis of standing waves. Here is the short version: A matched transmission line behaves like the theory books say it does. The rated power from the transmitter goes through the transmission line with the lowest possible loss to the antenna where it is radiated just like the book says. It is true that reducing SWR for a given line does reduce the loss if the line is long enough. (There are some scenarios where a short line with high VSWR has less loss than matched line of the same length.) But is matched line the real goal? If low loss is the goal, there are often cost effective lower loss solutions possible with lower loss line operated at high VSWR. A mismatched transmission just MIGHT work OK. If there is any possibility of generating interference, especially TVI, it will. The Why? How is TVI "generated" by line mismatch? Owen -- |
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