| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmitter for track circuits that prevents output of an unnecessary frequency component during a transition of a signal transmitting state.SOLUTION: A transmitter for track circuits 1 includes: an ATC signal output control unit 3; an ATC carrier wave generator 4; a selector 6 that selects in response to an instruction 5, which is received from the ATC signal output control unit 3, whether or not to output an input signal received from the ATC carrier wave generator 4; a modulator 8 that performs frequency modulation according to ATC information 7 to be sent from the ATC signal output control unit 3; a level adjuster 10 that adjusts an output level in response to an instruction 9 received from the ATC signal output control unit 3; an amplifier 11 that amplifies the power of an output of the level adjuster 10; a voltage sensing unit 13 that senses an output voltage of an output signal and outputs the output voltage as voltage feedback information 12; and a current sensing unit 15 that senses an output current of the output signal and outputs the output current as current feedback information 14. Transmission of a signal is ceased or initiated via the level adjuster, whereby output of an unnecessary frequency component is prevented. |
