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I am trying to learn more about antennas and transmission lines and am
currently reading through the transmission line chapter of a recent ARRL Handbook. There is a calculated example for a load with a certain SWR connected to a transmission line with certain losses and the author states: "Because of losses in a transmission line, the measured SWR at the input of the line is less than the SWR measured at the load end of the line." My first reaction was Oh my God, I am soo proud of my decent SWR at the input of my antenna feedline and in reality I could have a really bad mismatch between the antenna and the transmission line and wouldn't even know about it. And my second thought was what is happening to the energy, since an SWR gives me an indication of how much power reaches the antenna and how much is either radiated from the feedline or lost as heat and here I have two different SWR in the system, one at the antenna and one for the antenna/feedline system. I think it can't be that I would loose a whole lot at the antenna (high SWR) but then wouldn't loose all that much for the system since the overall SWR is lower. Where do I go wrong?? Uwe |
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