Accession Number : AD0709612

Title :   DEVELOPMENT OF TRANSMITTER TUBE FOR TROPOSCATTER APPLICATIONS.

Descriptive Note : Rept. no. 3 (Final) 1 Jul 68-21 Jan 70,

Corporate Author : HUGHES AIRCRAFT CO TORRANCE CALIF ELECTRON DYNAMICS DIV

Personal Author(s) : Rousseau,Arthur L.

Report Date : JUN 1970

Pagination or Media Count : 74

Abstract : The program objectives were to determine the design criteria for a highly efficient (50% overall efficiency including focusing and cooling power), 10 kW CW traveling-wave amplifier at C-band and to construct, test and deliver two (2) advanced exploratory development models of the device. This amplifier was to have 11 dB of gain to boost the output power of existing 1 kW troposcatter systems using readily available power generators. Techniques to improve the efficiency by reducing the power necessary to cool the device were an integral part of the program. The tube employs a coupled cavity interaction circuit with a solenoid focused, semi-confined flow electron beam. Improvement in basic tube efficiency is accomplished by voltage jump and phase velocity tapering combined with collector depression. Cooling efficiency is improved by utilizing vapor phase (nucleate boiling) cooling, which eliminates the need for a coolant pump. During the program, the feasibility model tube, designed on a previous program, was tested and two advanced model tubes were designed, constructed and tested. For all of these tubes, excellent agreement with theoretical calculations was obtained. Interaction efficiencies of up to 60% with collector depression and over 50% or greater efficiency, including solenoid and cooling power, was obtained across the frequency band of 4.4 to 5.0 GHz. (Author)

Descriptors :   (*TRAVELING WAVE TUBES, *MICROWAVE COMMUNICATIONS), (*MICROWAVE AMPLIFIERS, TRAVELING WAVE TUBES), C BAND, MULTIPATH TRANSMISSION, RADIOFREQUENCY POWER, COOLING, NUCLEATE BOILING

Subject Categories : Electrical and Electronic Equipment
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE