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On 10/24/2013 8:02 AM, J.B. Wood wrote:
On 10/24/2013 08:10 AM, W5DXP wrote: On Thursday, October 24, 2013 5:54:05 AM UTC-5, J.B. Wood wrote: So the above statements don't make sense. I agree that the E/M ratio for far field signals in space is a constant. That doesn't prohibit a receiving antenna from creating its own unique near-field conditions and altering that ratio just as there is nothing prohibiting a load from altering the E/M ratio that exists in a transmission line. In fact, the E/M ratio must necessarily be altered at impedance discontinuities. Example: Two different antennas are receiving the same signal and indicating the same signal level. As a human walks close to the two antennas, the received signal strength of one antenna changes radically while the received signal strength of the other is affected by only a small amount. If both antennas were *accepting* the same fixed far-field E/M ratio, a human body should have the same effect on both antennas but we can demonstrate that it doesn't. -- 73, Cecil, w5dxp.com Don't have argument with the above, Cecil, but these phenomena appear to be in addition to what I think was being discussed. Sincerely, J.B. - I have always understood EMF to be exactly as you have explained. I did not know how to refute the misunderstanding by others on this topic. Thanks for handling this discussion. |
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