PHASE SHIFT OSCILLATORS 



603 



fH 



OSCILLATOR °) 



TUBE 



2C 



REACTANCE 



TUBE 



fo=- 



'T=^ 



'°~2-tT/LC' 



Yig. 4 — LC reactance tube modulated phase shift oscillator. 



OSCILLATOR 

 TUBE 



r 



REACTANCE 

 TUBE 



r 



r 



fo = 



1.2 



2TrRC 



Fig. 5 — RC reactance tube modulated phase shift oscillator. 



Circuit Description 



The theory and design of conventional reactance tube modulated oscil- 

 lators has been discussed adequately in the literature' ■■'•^. A schematic in 



' "Frequency Modulation" (book) by August Hund — McGraw-Hill, New York, 1942. 

 Page 155. 



^ "Automatic Tuning, Simijliticd Circuits and Design Practice," D. E. Foster, and 

 S. W. Seelev. Proc. I. R. E., Vol. 25, 1937, page 289. 



3 .\TC Systems— Wireless World, February 19, 1937, page 177. 



