250-500 MC LOW-NOISE TRAVELING-WAVE TUBE AMPLIFIER
Abstract
Results are presented of tests performed on 6 experimental tubes. Gains obtained were marginal being of the order of 20 to 23 db. Noise figure performance of 5 to 6 db indicated that gun parameters were not optimum. Tests employing a field peaker showed that for an 18% larger beam diameter, gain will increase by 6 to 8 db. A direct-pin match employing spread-turns of the helix and a two-section quarter-wave transformer resulted in an input match with VSWR less than or equal to 1.8:1 and insertion loss of a few tenths of a db. Cold attenuation in excess of 90 db was obtained with a lossy carbon film applied over a 2 3/4 inch length of the three ceramic helix support rods. Results of a life test program are summarized. Power complement design was completed and circuit breadboarding was initiated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 14, 1961
- Accession Number
- AD0257947
Entities
People
- Robert E. Vehn
Organizations
- Watkins-Johnson Company