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Theory of Frequency Modulation Noise in Tubes Employing Phase Focusing
1.“Microwave noise study,” Quarterly Progress Report Nos. 1, 2, and 3, February 1, 1953 to November 1, 1953, Raytheon Manufacturing Company, Contract AF 19 (604)–636.
2.Magnetrons will be considered specifically because more data are available.
3.J. L. Stewart, Proc. Inst. Radio Engrs. 42, 1539 (1954).
4.H. W. Welch, Jr., Proc. Inst. Radio Engrs. 41, 1631 (1953).
5.All units are in the M.K.S. system.
6.P. Guénard and H. Huber, Ann. Radioélec. compagn, franç. assoc. T.S.F. 7, 252 (1952). Guénard and Huber report temperatures on the order of one‐half million degrees Kelvin in non‐oscillating tubes. Although no published data seem to be available, it would appear that temperatures in the oscillating magnetron are much larger than this.
7.In an analogous fashion, one can postulate the existence of a similar kind of FM noise in backward wave and other types of beam tubes.
8.The lower limit can be interpreted as either the radius of the cathode or the radius of the subsynchronous swarm, whichever is applicable.
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