For some time the subject of noise generation in magnetrons has been under study in our laboratory. The unmodulated CW magnetron was chosen as the first subject for investigation, because some of the complications of pulsed or modulated tubes are thus avoided. Since any heterodyning method introduces the noise of another microwave oscillator, a method of direct detection has been employed. This method involves the use of a crystal-video receiver for both AM and FM detection.
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Werner Gottschalk (1954) studied this question.
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