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April 27th 05, 04:36 PM
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On Wed, 27 Apr 2005 09:26:48 -0400, "J. Mc Laughlin"
wrote: Well reasoned. Think of a three-dimensional curve of cost, uncertainty, and frequency to measure gain on a range. Think of a second 3D curve involving modeling. My guess is that below something like 20 MHz (use your own number) modeling is to be preferred. On a related topic: I saw with my own eyes NBS in Boulder (c. 1978) using a different technique to measure gain. It was a near field scheme where a probe was moved in front of the antenna while its vector voltage and position was measured. (As I recall, a pair of lasers was used in the measurement of the probe's x and y position.) The (vast number of) measurements were then imported into a computer that computed the gain. As we say: "you could do that!" I never thought to ask what the expected uncertainties were expected to be. http://www.nearfield.com/ |
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