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Life characteristics assessment of the communications technology satellite transmitter experiment packageThe performance characteristics of the transmitter experiment package (TEP) aboard the Communications Technology Satellite (CTS) measured during its first 2 years in orbit are presented. The TEP consists of a nominal 200 watt output stage tube (OST), a supporting power processing system (PPS), and a variable conductance heat pipe system (VCHPS). The OST, a traveling wave tube augmented with a 10 stage depressed collector has an overall saturated average efficiency of 51.5 percent and an average saturated radio frequency (rf) output power at center band frequency of 240 watts. The PPS operated with a measured efficiency of 86.5 to 88.5 percent. The VCHPS, using three pipes to conduct heat from the PPS and the OST to a 52 by 124 centimeter radiator fin, maintained the PPS baseplate temperature below 50 C for all operating conditions. The TEP performance characteristics presented include frequency response, rf output power, thermal performance, and efficiency. Communications characteristics were evaluated by using both video and audio modulated signals. On four occasions, the TEP experienced temporary thermal control system malfunctions. The anomalies were terminated safely, and the problem was investigated because of the potential for TEP damage due to the signficant temperature increases. Safe TEP operating procedures were established.
Document ID
19790023093
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Smetana, J.
(NASA Lewis Research Center Cleveland, OH, United States)
Curren, A. N.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1979
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Report/Patent Number
E-049
NASA-TM-79181
Accession Number
79N31264
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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