NON CONTACT TYPE AUTOMATIC TICKET EXAMINATION MACHINE

摘要

PURPOSE:To suppress the generation of a beat signal and to previously prevent the generation of a signal fault by connecting an oscillation means for generat ing a signal with prescribed frequency in a transmitter to an oscillation means in a transmitter in an adjacent automatic ticket examination machine through a coupler. CONSTITUTION:A transmitter T1 has an oscilltor 30 for generating a signal with prescribed frequency and the signal generated from the oscillator 30 is supplied to an antenna (a) through a coupler 31 and a ciriculator 32. The antenna (a) receives a radio wave projected from a card C and the received signal is inputted from the circulator 32 to a receiving part 33. The coupler 31 are mutually connected to couplers included in transmitters T2 to Tn in other machine bodies through connection line L such as a high frequency signal coaxial cable and circulators. Thereby oscillators 30 in respective transmitters T1 to Tn are mutually interpolated and set up to the same frequency. Thereby the frequency bands of signals radiated from antennas (a) in respective bodies are the same and the generation of a beat signal can be effectively suppressed.