Accession Number : AD0655001

Title :   INVESTIGATION OF LOW WEIGHT FOCUSING SCHEMES FOR TRAVELING-WAVE TUBE AMPLIFIERS.

Descriptive Note : Quarterly rept. no. 2, 15 Oct 66-14 Jan 67,

Corporate Author : WATKINS-JOHNSON CO PALO ALTO CALIF

Personal Author(s) : Nelson,J. N.

Report Date : FEB 1967

Pagination or Media Count : 25

Abstract : The report describes the results on a program concerned with the development of a 3 dB noise figure, 4 pound, X-band low-noise TWT amplifier. A noise figure of 6.2 dB has been achieved with a solid beam tube focused in an 800 gauss SRPM, weighing less than 3 pounds. A miniature 700 gauss Alnico 8 SRPM has been fabricated which weighs less than 2 pounds. Further experiments are underway with solid beam SRPM tubes, and we expect to achieve noise figures less than 6.0 dB over the 8.0 to 10.0 frequency range during the next quarter. Two hollow beam tubes have been designed and fabrication initiated. The first design employs a miniature Alnico 9 PM focusing assembly. This magnet weighs less than 3 pounds and provides a peak field in the cathode-electron gun region of 1400 oersteds. The second hollow beam tube is designed to be focused in an SRPM. It will be used to investigate the collapsing effect of an annular beam as the beam passes through a magnetic field reversal. (Author)

Descriptors :   (*MICROWAVE AMPLIFIERS, TRAVELING WAVE TUBES), (*TRAVELING WAVE TUBES, *FOCUSING), WEIGHT, X BAND, MAGNETS, GAIN, NOISE(RADIO), ELECTRON BEAMS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE