Abstract: A pulse interference canceler cancels pulse interference signals by normaing the signals and comparing in time the normalized signals to each other. An overlap of the normalized signals indicates that both channels of the pulse receiver received transmissions simultaneously or near simultaneously, thereby indicating interfering signals. Detection of the simultaneous or near simultaneous normalized pulses generates a blanking pulse that suppresses any output pulses corresponding to the received interfering signals.

Abstract: A trailer hitch ball assembly includes a vertical post for attachment to a vehicle drawbar. The post has a smooth cylindrical upper portion and a circumferential retainer groove for receiving and retaining a ball while permitting rotation of the ball. The ball includes a central bore which receives the post upper portion and a retainer screw for engaging the retainer groove. A threaded lower portion and two nuts are utilized to secure the post on the drawbar. The threaded portion may include an exposed free portion for storing a replacement ball of the same or different diameter.