Title :
A TWT grid modulator for MTI radar transmitters
Author_Institution :
Raytheon Co., Wayland, MA, USA
Abstract :
The design of HV (high-voltage) pulse circuitry using series connected HV MOSFETs is traced from the development of the basic switching module through integration into a TWT (traveling wave tube) modulator. The modulator deck floats at the -45.5 kV TWT cathode potential and supplies filament power and control grid pulses directly to dual TWTs. Prime power is 115 VAC, 70 Hz, single phase. Control signals, start and stop pulses and fault signals are transmitted via a multichannel fiber optic link. RF stability measurements made on the transmitter have confirmed the adequacy of the modulator design
Keywords :
modulators; radar transmitters; travelling-wave-tubes; -45.5 kV; 115 V; 60 Hz; HV pulse circuitry; RF stability measurements; TWT grid modulator; cathode potential; control signals; fault signals; filament power; grid pulses; moving target indication radar; multichannel fiber optic link; series connected HV MOSFET; start pulses; stop pulses; traveling wave tube; Cathodes; MOSFETs; Optical control; Optical pulses; Optical transmitters; Pulse circuits; Pulse modulation; Pulsed power supplies; Radar; Switching circuits;
Conference_Titel :
Power Modulator Symposium, 1990., IEEE Conference Record of the 1990 Nineteenth
Conference_Location :
San Diego, CA
DOI :
10.1109/MODSYM.1990.200971
