420 BELL SYSTEM TECHNICAL JO URNAL 



Fs standard frequency used to check the oscillator at the 



high end of the scale 

 Ft frequency at which the scale changes from linear to 

 logarithmic 

 / length of the scale interval from to F 

 / frequency of the variable oscillator 

 /' frequency of the fixed oscillator 

 fo frequency of the variable oscillator at the setting 



F^ Fo 

 L inductance in the resonant circuit of variable oscillator 

 C total capacitance in the resonant circuit of variable 



oscillator 

 Co total capacitance in the resonant circuit of variable 

 oscillator when set to 7^ = Fo 

 Ca = C — Co capacitance change in the air condenser 

 AFo variation in the standard frequency Fo 

 AC a variation in Co. 

 ACo variation in Co 

 AL variation in L 

 Al smallest readable scale interval 

 p relative frequency error AF/F 

 AF error in F 

 AFfo error in F caused by AFo 

 AFco error in F caused by ACo 

 AFca error in F caused by ACa 



References 



"Beat-Frequency Oscillators," M. S. Mead, Jr. G. E. Rev., v. 32, pp. 521-529, Oct., 



1929. 

 " Beat-Frequency Oscillator," M. F. Cooper and L. G. Page, Wireless Engineer, v. 10, 



pp. 469-476, Sept., 1933. 

 "Precision Heterodyne Oscillators," D. A. Bell, Wireless Engineer, v. 11, p. 308, 



June, 1934. 

 "Precision Heterodyne Oscillators," W. H. F. Griffiths, Wireless Engineer, v. 11, pp. 



234-244, May, 1934. 

 "A Precision Heterodyne Oscillator," L. E. Ryall, P. O. E. E., JL, v. 27, pp. 213-221, 



Oct., 1934. 

 "The Beat-Frequency Oscillator," M. Slaffer, Wireless Engineer, v. 11, pp. 25-26, 



Jan., 1934. (Letter to the Editor.) 

 "Further Notes on Precision Heterodyne Oscillators," W. H. F. Griffiths, Wireless 



Engineer, v. 12, pp. 357-362, July, 1935. 

 "Beat Frequency Oscillators," A. W. Barber, Radio Engg., v. 16, pp. 13-16, July, 



1936. 

 "A Beat-Frequency Oscillator," L. B. Hallman, Commun. Sf Broadcast Engg., v. 3, 



pp. 10-13, May, 1936. 



