Abstract

Simple and rapid methods for adjusting the frequency of a radio frequency oscillator in small steps of frequency by aural methods are described. By use of the nth harmonic of the radio frequency oscillator the steps of frequency may be made 1/n times a convenient fixed audio frequency, such as that of a tuning fork. By elaboration of the equipment the adjustments may be made to within 1/n cycles per second, where n is the order number of the oscillator harmonic employed.

© 1928 Optical Society of America

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References

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  1. Editor’s Letter. “A Modified Beat Method of Comparing Two High Frequency Oscillations” Exp. Wireless and Wireless Eng.Mar.1927.

1927 (1)

Editor’s Letter. “A Modified Beat Method of Comparing Two High Frequency Oscillations” Exp. Wireless and Wireless Eng.Mar.1927.

Exp. Wireless and Wireless Eng. (1)

Editor’s Letter. “A Modified Beat Method of Comparing Two High Frequency Oscillations” Exp. Wireless and Wireless Eng.Mar.1927.

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Figures (2)

F. 1
F. 1

By means of the heterodyne and tuning fork, it is possible to adjust the driving oscillator to successive frequencies differing from each other by 1/n times the tuning fork frequency where n is the number of the driver harmonic which is used to produce beats in the heterodyne. The accuracy is only moderate,—within 5 cycles per second, approximately.

F. 2
F. 2

When the two heterodynes are employed, as indicated above, it is possible to adjust the driving oscillator in steps of frequency differing from each other by 1/n or 1/2n times the tuning fork frequency, with an accuracy of 1/n cycle per second, where n is the order number of the driver harmonic which is used to produce the beats in the heterodyne.

Tables (1)

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Table 1 Table of driver frequencies obtainable by successive settings of two heterodynes, having a constant difference in frequency

Equations (1)

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Δ F = f / n c p s