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A new microwave detector is described which possesses extremely large bandwidth capabilities in addition to being free from power limitations. The sensitivity is comparable to that of a crystal. This new device operates on the electron beam of a traveling wave tube as a velocity sorter by utilizing the stop-band phenomenon of a periodic magnetic focusing system. The electrons are sorted according to their rf velocity modulation and thus the collector current is a function of the microwave power in the beam. Several important related devices are discussed including a high level mixer.