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Antonio Vernucci wrote:
The extra power measured at the receiver is obviously "created" at the expense of power taken away from other regions of the space (according to the transmit antenna pattern). Too fundamental to deserve further discussions! Almost everyone knows what occurs in free space - constructive interference in the direction of greater gain and destructive interference in the direction of lesser gain. But my posting was not about free space. I thank you for your input so far but please now extend those EM wave concepts to transmission lines. Everyone doesn't agree that constructive and destructive interference also happens at a Z0- match point in a transmission line with reflections. That is the topic that needs "further discussions". Just as constructive interference functions to increase antenna gain in one direction while destructive interference functions to decrease antenna gain in another direction, in a transmission line at a Z0-match point, constructive interference functions to increase the energy flow toward the load while destructive interference functions to decrease the energy flow toward the source. Antonio, please don't bow out now. You are apparently one of the few posters who fully understands interference. -- 73, Cecil http://www.w5dxp.com |
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