| 摘要 |
<p>PURPOSE:To heighten the efficiency in use of a signal transmission medium by also attaching managing data for a power source and a device, etc., on the signal transmission medium such as a microwave, etc., in addition to cutoff information. CONSTITUTION:At a transmitter A, the microwave generated at a microwave transmitter 1 is modulated at an amplitude modulator 2, and is radiated from a transmission antenna 3. At such a case, a modulation signal to be applied on the amplitude modulator 2 becomes a signal repeating the signal in which a single modulation signal (cutoff alarm transmission interval) from a single frequency modulation signal generator 5 and a data signal (equipment managing data transmission interval) from a control circuit 7 or a data input circuit 6 are combined at a modulation signal control circuit 4. Thus, since the cutoff alarm transmission interval and the equipment managing data transmission interval are provided at the microwave emitted from the transmitter A, a wave medium such as an electric wave, etc., can be effectively used.</p> |
