SLIDE 5 BEAMED RF POWER TECHNOLOGY dc^RF CONVERTER RFI CHARACTERISTICS A COLLECTION OF AVERAGE PM AND AM NOISE DATA AND HARMONICS FROM VARIOUS POWER LEVEL KLYSTRONS AND MAGNETRONS IS SHOWN EXTRAPOLATED TO A 4 KHz BANDWIDTH. THE MAGNETRONS ARE PHASE INJECTI ON LOCKED AND HAVE THEIR FILAMENT EXCITATION REMOVED AFTER TURN-ON. SOME KLYSTRON AND EVEN SOLID STATE DEVICES' NOISE PERFORMANCE IS BETTER IN SELECTED DESIGNS AND IN SELECTED REGIONS FROM THE CARRIER. THIS "AVERAGE" DATA IS FELTTO REPRESENT AN UPPER BOUND. THERE ISA CONSTANT NOISE "FLOOR" OUT OF KLYSTRONS THAT EXISTS EVEN WITHOUT RF DRIVE, DUE TO THE HOT-RANDOM ELECTRON BEAM PASSING BY THE OUTPUT RESONATOR CAVITY. ON AVERAGE, THE KLYSTRON APPEARS AS A 35 TO 45 dB NOISE FIGURE AMPLIFIER INDEPENDENT OF OUTPUT POWER LEVEL. ADDITIONALLY, A BURST-LIKE, BROADBAND NOISE OUTPUT CHARACTER IS EXHIBITED BY HIGH POWER WAVEGUIDE SYSTEMS DUE TO MICROCRACK DISCHARGES. THE DURATION AND LEVEL IS A FUNCTION OF GUIDE CLEANLINESS AND MAINTENANCE.
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