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Keith wrote:
"At these minima, rather than the energy flow being 0 as it is for an open or shorted line, the energy flow (power) is exactly the energy being delivered down the line." The power is not zero at an SWR zero, provided that the line has power flow. The power flow at the specified null is equal in forward and reflected wave directions as shown by the complete zero. Power delivered by the source and to the load is the forward power minus the reflected power. In the case of a complete reflection, the difference between forward and reflected power is zero, so the load is rejecting all the forward power, which is turned around and becomes the reflected power. In a lossless line, forward and reflected powers flow unabated from end to end of the line and are thus have their same amplitudes wherever they are measured in the line, including SWR null points. Best regards, Richard Harrison, KB5WZI |
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