The Measurement of Radio Frequency Resistance, Phase Difference, and Decrement

The methods of measuring resistance and related quantities at radio frequencies are fewer in number and necessarily different from those at low frequencies. The conditions of such measurements and the relations of various methods have not previously been given in comprehensive fashion. This paper shows the relations between resistance, phase difference, sharpness of resonance, and decrement. The methods of measurement are derived and classified. Most of the valuable methods are comprised under the resistance-variation and reactance-variation methods. Special direct-reading methods of measuring phase difference and decrement are presented.