Abstract: A circuit is provided for synchronizing the oscillation U.sub.o of a pulsed oscillator with a reference oscillation U.sub.m of comparatively small amplitude. The reference oscillation is coupled into the oscillator and a phase control loop is provided in which a phase discriminator compares the phase relationship of both oscillations and provides a resulting control voltage for controlling an adjustable reactance for the frequency change of the pulsed oscillator during the leading edge of the pulse. A phase shifter, adjustable up to 180.degree., is connected between the oscillator and the phase discriminator. The output of the phase discriminator, which is highly resistive, is connected in a low-resistance manner to the adjustable reactance by way of an impedance converter, such as an emitter follower or a multi-stage wide-band amplifier.

Abstract: A method for the comparative vector measurement of keyed radio signal pulses arriving nearly simultaneously at several radio receivers, particularly DME pulses, which can exhibit great level differences. The pulses at each receiver are individually fed to an amplifier or attenuator having an amplification or attenuation, respectively, which can be adjusted in distinct steps, whose reduction or increase, respectively, takes place automatically with the rise of the leading edge of the respective signal pulse. After passing through the respective amplifier or attenuator of the receivers, the instantaneous amplitudes of the measuring signals are measured at a specific measured time which is common to all receivers.

Abstract: A circuit arrangement for the digitalization of the angle of rotation .phi. of a rotatable device which is operated at fa rotations per second, employing auxiliary voltages modulated with sin .phi. and cos .phi. of a fundamental frequency fo, which with the aid of further circuit elements are converted into a counter pulse train which indicates the angle of rotation, in which n pulses correspond to the angle of rotation of 360.degree.; wherein from two auxiliary voltages is formed a third auxiliary voltage which contains only one of the frequencies (fo+fa) or (fo-fa), which third auxiliary voltage and a comparison voltage of the frequency n.sup.. fo are conducted to a comparator circuit, comprising a D-flip-flop, with the comparison voltage being present at the D-input (preparation input) and the third auxiliary voltage being present at the clock-input, whereby the desired counter pulse train with n.sup.. fa is obtained at the output of the D-flip-flop.

Abstract: A radar arrangement utilizes a rotating or pivotal antenna lobe and a primary radar device operating with a doppler evaluation system and a secondary radar device equipped with a rotating or pivotal antenna lobe wherein a certain time period (processing time) expires between the scanning of a recognized target by the lobe of the primary radar antenna and the recognition of this target during the target evaluation in the receiver of the primary radar device. A storage device is provided which captures the azimuth angle position of a target recognized by the primary radar receiver and interrogation signals of the secondary radar transmitter are triggered with the help of a control means associated with the storage device for a certain interrogation range only when the antenna lobe of the secondary radar device repeatedly approaches the target. The interrogation range is selected sufficiently large that a number of answer signals is triggered which suffices for the desired reply probability.