DEVELOPMENT OF TWO X-BAND VARIABLE GAIN TWTS (ONE LOW LEVEL AND ONE MEDIUM LEVEL).
Interim development rept. no. 3, 1 Jan-31 Mar 65,
MICROWAVE ELECTRONICS PALO ALTO CALIF
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Four tubes were fabricated and tested for small-signal gain, noise figure and power output during this reporting period. The large gap between performance obtained and that specified emphasizes the need for a more analytical approach to the problem. Theoretical analysis has been made of the effect of helix dispersion on attaining flat, wide-range 30 db gain control. The cases of positive and negative dispersion are presented to derive the relative merit of tubes fabricated with helices with these dispersions. An analysis of output power versus centerhelix voltage three-helix TWT has been made and correlation of data from a fabricated tube is attempted. Of special interest is the output-helix gain required to maintain constant power output and different gain levels. A short analysis of noise figure is made but further study must be pursued in this direction. Author