| 摘要 |
PURPOSE:To attain the economical system constitution by using a premises power line for transmission of a call signal and superimposing the call signal on the premises power line to eliminate the need for an exclusive call signal transmission line. CONSTITUTION:In calling a ratio call receiver 6, when a number supplied from a telephone set 1 to a receiver 6 is dialed,a private branch exchanger 2 is connected to a radio call encoder 3. The encoder 3 converts a dial data into a serial data, which applies FSK modulation and the result is sent to a private power line 4 via a private power supply line. The call signal sent to the power line 4 is applied to a transmitter 5 via the power line. The transmitter 5 is provided with a demodulator demodulating an FSK signal, the transmission section is modulated by the call data extracted by the demodulator and a week radio wave is sent from the transmitter 5. Thus, the receiver 6 can be called. |
