. The Bell System technical journal . Fig. 1—Standard field generator. In fact, one included a set similar to that described by Friis and Bruce { R. E., 14, 507-519, Aug. 1926). An extra ultra-high frequency combination(input circuits, beating oscillator, detector and amplifier) provided input at 6 the standard short wave receiver. The latter was tuned to operate at 6 mc. Since the writing of this paper, our attention has been called to the methoddescribed by K. Sohnemann, E. N. T., 8, 462, Oct. 1931. The Sohnemann methodalso uses a standard field generator but otherwise the techn
. The Bell System technical journal . Fig. 1—Standard field generator. In fact, one included a set similar to that described by Friis and Bruce { R. E., 14, 507-519, Aug. 1926). An extra ultra-high frequency combination(input circuits, beating oscillator, detector and amplifier) provided input at 6 the standard short wave receiver. The latter was tuned to operate at 6 mc. Since the writing of this paper, our attention has been called to the methoddescribed by K. Sohnemann, E. N. T., 8, 462, Oct. 1931. The Sohnemann methodalso uses a standard field generator but otherwise the technique is entirely differentfrom that of the Shaw method. ULTRA-SHORT WAVE PROPAGATION 129 the point of low potential with respect to the shield. From the readingof the meter and the dimensions of the loop, the field at nearby pointsmay be computed.^^ This, therefore, provides a field strength standardby comparison with which the unknown field can readily be ob-tained. Signals were received by means of a simple half-wave antennasuppo
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