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On-orbit performance of the 12 GHz, 200 watt transmitter experiment package for CTSPerformance characteristics from on-orbit tests of the Transmitter Experiment Package (TEP) for the Communications Technology Satellite (CTS) are presented. The TEP consists of a Power Processing System (PPS), an Output Stage Tube (OST), and a Variable Conductance Heat Pipe System (VCHPS), all of which are described. The OST is a coupled-cavity traveling-wave tube with a multistage depressed collector and a stepped velocity-tapered slow-wave structure for efficiency enhancement. It has an RF output power of 240 W and an overall efficiency of 51.5% at a center band frequency of 12.080 GHz. The PPS provides the required operating voltages, regulation, control, and protection for the OST. It has a measured dc-dc conversion efficiency of 86.5% to 88.5%. The VCHPS consists of a fin radiator and three dual-artery stainless steel heat pipes using methanol and a mixture of inert gases. Test results presented include efficiencies, RF output power, frequency response, and performance with single and multiple (two) carriers frequency-modulated by video signals.
Document ID
19770065111
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Alexovich, R. E.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1977
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Meeting Information
Meeting: International Conference on Communications
Location: Chicago, IL
Start Date: June 12, 1977
End Date: June 15, 1977
Sponsors: Institute of Electrical and Electronics Engineers
Accession Number
77A47963
Distribution Limits
Public
Copyright
Other

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