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In a carrier-type digital computer system, binary information can be represented by the presence or absence of an RF pulse in a given time interval. Using strip-line printed circuit techniques and point-contact diodes, passive AND and NOT gates were constructed which operate with RF pulses of less than 2 mÂ¿sec duration (i.e., an effective pulse repetition rate of 500 mc), at a carrier frequency of 3000 mc. The basic gates were combined to form half-adders. Unlike other carrier approaches, these circuits keep the information in RF form through all steps of the logic operations; i.e., both inputs and outputs of all elements are RF pulses.