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What is the Millington method used for?

  • A.Predicting field strength over a path of mixed ground types
  • B.Measuring the conductivity of the ground along a proposed route
  • C.Calculating the sky wave contribution at night for a medium wave station
  • D.Determining the optimum height for a broadcast transmitting mast

Answer: A

When a path crosses land and sea in succession, the simple curves do not apply, and Millington's method combines the curves for each section in a way that gives the correct result in both directions. It predicts the characteristic recovery of field strength when a wave passes from poor ground onto sea. Conductivity measurement, sky wave calculation and mast design are separate tasks. A method that handles a discontinuity by combining the solutions either side of it is a common engineering device.

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