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Ferrite attenuators for travelingwave tubes
enlarged beam hole
8 other sections not shown
amplitude analysis analyzed approximate backward-wave oscillation balanced mode bandwidth calculations capacitance cathode collector Contract Nonr Croix cutoff frequency density determine dF dF diode Doppler shift echoes effect electron equation experimental F-layer fading February 25 ferrite focusing folded-waveguide structure function gain glint Harris-flow beam Helitron oscillator helix impedance reduction factor input impedance investigation ionospheric iterative method line-sole loading M-type magnetic field maser Mayaguez meteor meteor whistles MICROWAVE nF modes noise noise figure numbers obtained one-hop operating output paramagnetic partially supported passband perturbation phase path plasma frequency plasma-frequency reduction factor plotted possible propagation constant Quarterly Status Report ratio region SB-100 transistors SCATTER-SOUNDINGS shown in Fig signal small-signal space-charge Staff strapped bifilar helix Supervisor supported by Contract technique theoretical tuning curves theory three receiving tion trans transmission TRAVELING-WAVE TUBES values velocity voltage wave waveguide Y-parameter Y-parameter model