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ACTIVE TRANSDUCERS FOR NOISE REMOVAL
Sn REDUCTION BY ACTIVE NETWORKS COUPLING
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active network active transducer amperes amplifier gain amplitude approximately assumed attenuation backward-wave bandwidth BEAM COUPLER beam modes beam noise beam-wave coupler Brillouin cancellation loop cavity circuit wave correlation coupler properties coupling curve device electron gun Equation set equivalent noise temperature experimental tube external amplifier fast wave fast-wave feed-back focusing frequency helical coupler helix helix interception increase input beam Input Coupler Position input signal interaction structure kinetic power klystron linear low-noise amplifier magnet current matrix Maximum Gain Mc/s microwave minimum noise figure noise cancellation noise contributions Noise Figure versus noise power density noise reduction noise sample noise sources operation output coupler output noise phase velocities Position for TWT receiver region resulting sampler coupler saturation setup shown in Figure shows slow beam wave slow wave spectral power density test amplifier Test Oscillator traveling-wave tube versus Input Coupler versus Magnet Current WAVE OUTPUT zero