Time multiplex electron beam with modulating means

Multiplexing apparatus for time multiplexing a plurality of individual channels, comprising a pair of electron beam tubes, each of said tubes having an electron gun located at one end of the tube and a target disposed at the other end of the tube, a first deflection device for deflecting the electron beam and causing said electron beam to sweep in a circle coaxial with the line between said gun and said target, a coupling arrangement interposed between said deflection device and said target, said coupling arrangement comprising a separate electrode for each of said channels distributed symmetrically about said circle, each of said electrodes being electrically connected to receive a signal corresponding to one of said individual channels for modulating the electron beam in accordance with said individual signals at one position during the circular sweep of said electron beam, a second deflection device interposed between said coupling arrangement and said target for returning the beam to a path between said electron gun and said target, and an amplifier unit interconnected between said second deflection device and the target of each of said tubes, means for connecting a carrier signal to said amplifier for producing a carrier modulated in accordance with the signals of the individual channels, means for supplying a channel signal representative of an individual channel in push-pull to corresponding electrodes of the coupling arrangements of said two tubes, and means for connecting the outputs of said amplifiers to a common terminal, said last named means including a 180.degree. phase shifter interconnected between one of said amplifer units and said common terminal.