The klystron was the first significantly powerful source of radio waves in the microwave range; before its invention the only sources were the Barkhausen-Kurz tube and split anode magnetron, which were limited to very low power.
The klystron was the first significantly powerful source of radio waves in the microwave range. Before its invention the only sources were the Barkhausen-Kurz tube and split anode magnetron, which were limited to very low power.