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alhearn wrote:
Herein lies one of the big problems with the "reflection" definition, conceptually. That's why I often resort to a signal generator with a circulator/load to illustrate my point. That signal generator *is* a constant power source. Therefore, what is commonly called "reflected power" is power that never leaves the transmitter and is dissipated as heat by the transmitter's internal 50 ohm impedance (if the transmitter's design doesn't prematurely shut down first). You can mount an argument that if the source doesn't see its source impedance, then there is a reflection at that internal mismatch. But that's not what is commonly called reflected power. When we talk about reflected power on this newsgroup, we are usually referring to the forward power rejected by a mismatch between the transmission line Z0 and the antenna impedance (associated with mismatch loss). In a typical ham radio antenna system, the "lost" reflected power is forced to engage in destructive interference at the tuner and thus joins the forward power wave. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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