A Noise Theory for the Magnetron. I. The Temperature Limited Low Current Densit Magnetron
MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
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In Part I of this paper a noise theory is given for a temperature limited magnetron, valid for sufficiently low current densities, from which one can calculate the shot noise produced by such a tube in terms of the magnetron parameters and of the orbit of an individual electron. This theoretical noise output is compared with that actually produced by an experimental c-w magnetron type QK61 and two important differences are noted. The observed noise is as much as 30 db above the theoretical shot noise under certain conditions, while the observed rate of change of noise power with plate voltage is many times greater than that predicted for the theoretical shot noise. A general discussion of the possible origins of this excess noise is given and a theory to explain it is given in Part II of this paper, Technical Reports Nos. 117 and 118.
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