Development of a Versatile Linear Gridded-Tube/Cavity UHF Power Amplifier

Abstract

Five EIMAC type 8938 or modifications thereof were fabricated and tested over the frequency range 225 to 400 MHz. Tube modifications included (a) application of a special high temperature 'prograde' grid coating, (b) application of high conductivity materials to critical parts of the tube configuration in order to reduce RF losses and provide improved thermal management, (c) the application of a coated particle cathode emitter material. Two different tunable cavities were fabricated during this period. The first, a narrow band cavity, was built in order to evaluate comparative performance of tubes (8938) and the modifications applied to those tubes. The other tunable cavity is a double-tuned iris coupled configuration and is the prototype wide band cavity for this program.

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Document Details

Document Type
Technical Report
Publication Date
Apr 15, 1974
Accession Number
AD0779479

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Cathodes
  • Conductivity
  • Electron Emission
  • Electron Tubes
  • Electronics Laboratories
  • Electrons
  • Emission
  • Frequency
  • Frequency Bands
  • High Gain
  • Materials
  • Oxide Cathodes
  • Power Amplifiers
  • Radio Frequency
  • Radio Frequency Amplifiers
  • Thermal Conductivity

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Surface Engineering/Surface Coating Technology.