Abstract: A two-way microwave television system for linking a master or teaching station with a plurality of sub-station schools via a single microwave link is presented. The sub-station schools are located at dispersed school sites and function as relay stations to complete a network covering a geographical area of greater dimensions than could be achieved by the master station unassisted. A single duplex microwave channel is used to transmit a picture originating at the master station and special effects generators located at each of the sub-station school relay sites combine, through a special video switching network, responses from each sub-station school to form an integrated frame containing the response from each sub-station in a format which can be transmitted on a single channel carrier.