NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Space-Qualified Traveling-Wave TubeThe L-3 Communications Electron Technologies, Inc. Model 999HA traveling-wave tube (TWT), was developed for use as a high-power microwave amplifier for high-rate transmission of data and video signals from deep space to Earth (see figure). The 999HA is a successor to the 999H a non-space qualified TWT described in High-Power, High-Efficiency Ka-Band Traveling-Wave Tube (LEW-17900-1), NASA Tech Briefs, Vol. 31, No. 2 (February 2007), page 32. Operating in the 31.8-to-32.3 GHz frequency band, the 999HA has been shown to generate 252 W of continuous- wave output power at 62 percent overall power efficiency a 75-percent increase in output power over the 999H. The mass of the 999HA is 35 percent less than that of the 999H. Moreover, taking account of the elimination of a Faraday cage that is necessary for operation of the 999H but is obviated by a redesign of high-voltage feed-throughs for the 999HA, the overall reduction in mass becomes 57 percent with an 82 percent reduction in volume. Through a series of rigorous tests, the 999HA has been qualified for operation aboard spacecraft with a lifetime exceeding seven years. Offspring of the 999HA will fly on the Kepler and Lunar Reconnaissance Orbiter missions.
Document ID
20100009688
Document Type
Other - NASA Tech Brief
Authors
Wilson, Jeffrey D. (NASA Glenn Research Center Cleveland, OH, United States)
Krawczyk, Richard (NASA Glenn Research Center Cleveland, OH, United States)
Simons, Rainee N. (NASA Glenn Research Center Cleveland, OH, United States)
Williams, Wallace D. (NASA Glenn Research Center Cleveland, OH, United States)
Robbins, Neal R. (L-3 Communications Electron Technologies, Inc. Torrance, CA, United States)
Dibb, Daniel R. (L-3 Communications Electron Technologies, Inc. Torrance, CA, United States)
Menninger, William L. (L-3 Communications Electron Technologies, Inc. Torrance, CA, United States)
Zhai, Xiaoling (L-3 Communications Electron Technologies, Inc. Torrance, CA, United States)
Benton, Robert T. (L-3 Communications Electron Technologies, Inc. Torrance, CA, United States)
Date Acquired
August 25, 2013
Publication Date
March 1, 2010
Publication Information
Publication: NASA Tech Briefs, March 2010
Subject Category
Man/System Technology and Life Support
Report/Patent Number
LEW-18220-1
Distribution Limits
Public
Copyright
Public Use Permitted.

Available Downloads

NameType 20100009688.pdf STI

Related Records

IDRelationTitle20100009649Analytic PrimaryNASA Tech Briefs, March 2010