Abstract: A circuit for synchronizing a pseudo-random generator at a receiver and which actuates a phasing device that cancels phase shift keying accomplished at the transmitter and uses a regulating loop with a delay device such as a delay line for correlating the received signal with the pseudo-random sequence which is produced at the receiver and conforms with a transmitter pseudo-random sequence and consists of a random alignment of the binary values L and H in a fixed pulse plan where the sequence repeats following a specific number of timing pulses and wherein the delay device which is fed with the received signal has a plurality of tappings which are of the same time spacing and which correspond to the reciprocal of the pulse train frequency of the pseudo-random sequence with a first portion of the tappings connected directly to an adding device at the receiver and the second portion of the tappings connected to the adding device through an 180.degree.