Accurate Method of Measuring Transmitted Wave Frequencies at 5000 and 20,000 Kilocycles per Second

The measurement of the frequency of a radio transmitting station offers a convenient means of intercomparison of frequency standards situated in different laboratories. While there have been several articles published dealing with station frequency measurements, these have, for the most part, considered frequencies in the broadcast band or lower. This paper describes a method of measuring station frequencies applicable to any frequency but dealing primarily with frequencies of approximately 5000 kc and 20,000 kc. A high order of precision is obtained by the use of harmonics and audio-frequency beat notes. Most of the units of the equipment employed have been previously described in connection with other applications.