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Early MW Field Measurements
Reg wrote:
Walt, did you measure ground conductivity and permittivity? Or did you forget like messrs B, L & E. ___________ Wasn't this measurement sequence made close enough to the radiators so that ground conditions were unimportant? The need was to establish the "efficiency" (note) of medium-wave radiators of various heights with ground systems of various configurations to use as a basis for an allocations plan for commercial MW broadcasting. The FCC reviewed and adopted it, and it has served quite well as such for many decades now. From reading his publications it can be seen that George Brown was a meticulously careful engineer. It is unlikely that he would "forget" anything that was germane to the purpose of this study. Note: Efficiency in this case meaning the horizontal plane field intensity at distances close enough to the vertical radiator that ground conditions and earth curvature can be ignored. RF |
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