Abstract: The power supply for an airborne pulse radar includes an unfiltered source of 400 cycle AC power connected to a full wave rectifying circuit including two diodes associated with each phase of the three phase input circuit. In addition, three SCR's are employed for controlling the operation of the rectifiers. During normal operation of the pulse magnetron power supply, the control electrodes of the SCR's are biased to the conducting or enabled state by a small floating DC voltage which is obtained from a small DC power source which includes a rectifier circuit connected to the floating secondary of a low voltage transformer. When a fault is sensed in the magnetron pulse circuitry as indicated by the drawing of excessive current, a switching circuit is activated which removes the enabling voltage across the SCR's, so that the input rectifier circuitry is disabled, thus preventing burn-out of components included in the pulse generation circuitry.

Abstract: The use of high voltage relays in variable pulse width magnetron type triggering circuits are avoided by the use of two separate pulse-forming networks. In addition, two separate banks of charging capacitors and switching transformers are employed. Separate SCR's are employed to apply charging current to either the first or the second bank of storage capacitors. Additional SCR's are employed to initiate the triggering sequence for the selected pulse-forming network and associated circuitry. The selected pulse length might be microsecond or one-quarter microsecond, with pulse repetition rates of 1,000 to 2,000 pulses per second. Accordingly, the duty cycle could be in the order of 0.001%, or less, but the output pulse power during the "on" time for the circuit might be in the order of several hundred kilowatts. During each cycle of operation, the two switching transformers and the output pulse transformer, which are both of the square or rectangular hysteresis loop type, are reset.