The Application of Counter Techniques to Precision Frequency Measurements

Principles of precision frequency measurement by use of electronic counters are discussed and limitations of frequency range extensions by the heterodyne method are outlined. A completely new frequency meter for use up to 42 mc/s is described which has the advantages of direct read-out, simple operation, and an accuracy of ± 1 part in 10⁷ ± 1 c/s. Consideration is given to means of extending the frequency range into the V.H.F. and U.H.F. bands. A typical converter for the range 40 - 150 mc/s is described.