An interference cancellation systems based on theoretical considerations were constructed to suppress interference at receiver input from one or more high-powered transmitter's and to permit collocation of the receiver and transmitter's. The fundamental characteristics and field test performance of the interference cancellation systems were classified and it is shown that the new cancellation systems have a good possibility of being put into practical use. MTRODUCTIONOn many electromagnetically dense platforms (ships, aircrafts, patrol boats etc.) the collocation of receiver (Rx) and a high-powered transmitters (Tx) is necessary for technical convenience, but it is difficult to achieve since the overhelming field fiom the high-powered Tx radiating antenna does not usually permit reception of signals in the immediate vicinity of such an antenna [l, 2,