| 摘要 |
PURPOSE:To provide a communication system of high reliability which has a low power consumption and doesn't fall to the uncommunicatable state regardless of a disturbing wave. CONSTITUTION:Plural carriers different by frequencies are successively switched and are supplied from a PLL circuit 4 to an FSK modulation circuit 3, and the carrier is modulated by transmission data and is transmitted from an antenna 7. On the transmitter side, a disturbed channel out of channels of carriers is detected by a detection circuit 8, and the carrier of this channel is not used to perform frequency hopping. |
