D-C charged magnetic pulse modulator

An a-c charged magnetic pulse modulator consisting of a resonant charging stage and several successive pulse-modulating stages is the subject of a paper by W. S. Melville.1 These pulse-modulating stages employ saturable reactors used as switching elements, and a series of capacitors. This modulator, if designed for a high-pulse repetition frequency, requires a separate frequency converting device whose output frequency must be equal to the desired pulse repetition frequency. Either an alternator or a magnetic frequency multiplier can be employed for this purpose. However, the magnetic frequency multiplier has considerable weight and volume, as well as a low power factor for high ratios of frequency conversion. An alternator, if built for a low speed, will also have a large weight. If designed for high speed, it has a limited life resulting from problems with bearings. To have a jitter-free-operation of the radar system, the voltage and frequency of the supplying power source must be regulated to close tolerances.