It is shown that a field-strength measuring set having a symmetrical closed-loop aerial coupled inductively through an electric screen to an unsymmetrical amplifier, can conveniently be calibrated in terms of a measured current passed through the coupling coil. The calibration so determined was found to be in satisfactory agreement with standard-field calibrations at wavelengths of 8 m. and 20 m.
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Colebrook et al. (1941) studied this question.
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