Title :
A high efficiency traveling-wave tube for L-band aeronautical, maritime, and mobile satellite communication systems
Author :
Sauseng, O. ; Johnston, J.M. ; Leigh, C.M.
Author_Institution :
Hughes Aircraft Co., Torrance, CA, USA
Abstract :
An L-band space communications tube (8537H) has been developed that provides 80 to 100 W power with about 60% efficiency, while maintaining excellent phase-linearity characteristics. At saturation the differential phase shift is 35 degrees , while the AM/PM (amplitude modulation/pulse modulation) conversion factor is 3.5 degrees /dB at the 80-W power level. The third-order intermodulation distortion provides a C/I (carrier/intermodulation) value of 23 dB at 7-dB output power backoff level. The tube is relatively small in size and weight, with a tube length of 23.6 in, and a weight of only 5.75 lb. (2.6 kg). The tube has a very long life expectancy, estimated to 120000 hours (14 y).<>
Keywords :
intermodulation; microwave links; mobile communication systems; radio transmitters; satellite relay systems; travelling-wave-tubes; 23.6 inch; 60 percent; 80 to 100 W; 8537H; AM/PM; L-band; TWT; aeronautical communication systems; carrier intermodulation; differential phase shift; maritime communication system; mobile satellite communication systems; phase-linearity; saturation; space communications tube; third-order intermodulation distortion; traveling-wave tube; Aerodynamics; Aircraft; Electrons; Frequency; Impedance; Intermodulation distortion; L-band; Linearity; Satellite communication; Space exploration;
Conference_Titel :
Aerospace Applications Conference, 1988. Digest., 1988 IEEE
Conference_Location :
Park City, UT, USA
DOI :
10.1109/AERO.1988.38662
