Abstract: A radar transmitter includes a ripple and droop reduction circuit to reduce the ripple and droop of the beam (power) supply. A beam supply filter capacitor is connected to the source of power and an operational amplifier has its balanced input ac connected across the beam supply capacitor. A transistorized amplifier stage inverts the signal from the operational amplifier and amplifies its absolute value up to the same level appearing across the beam supply filter capacitor. A transistorized follower stage is connected to the transistorized amplifier stage for receiving the inverted signal and producing a low impedance output for insertion in series with the beam supply filter capacitor for ripple and droop cancellation. A traveling-wave-tube is connected to the supply power capacitor which receives the ripple and droop free capacitor output and produces substantially consistent pulses for transmission.

Abstract: The specification discloses a semiconductor magnetic modulator for use with a moving target indicator radar transmitter and which utilizes a plurality charging capacitors for receiving charging current from a direct current power source and discharging in parallel. Silicon controlled rectifiers are connected to each of the charging capacitors and are operable to triggering signals to cause said capacitors to discharge at a predetermined time. A de-Q-ing circuit is connected to each of the charging capacitors in order to sense the voltage level across the capacitors and to dissipate voltage above a predetermined threshold level. The charging capacitors discharge through a hold-off inductor and through a switching transformer to a pulse forming network including a second charging capacitor. Compression occurs in the pulse charging network and a resulting high power modulator pulse is applied from the network to a klystron power tube in a moving target indicator radar transmitter.