| 摘要 |
PURPOSE:To prevent a malfunction due to a noise by resetting a signal detecting circuit and stopping the transfer of a signal when a noise detecting filter detects the noise. CONSTITUTION:A receiving means 4 is equipped with a high frequency circuit 5 which receives and detects a main carrier transmitted from a transmitting means 1, a sub-carrier filter 6 which selects a sub-carrier, and a noise detecting filter 7 which detects the noise signal of a frequency element other than the sub-carrier, and when a receiving level drops or the noise is mixed into a transmission path and the signal cannot be surely transmitted, a resetting signal inputted from a resetting circuit 9 forcibly resets the circuit, and the transmission of the signal is forcibly stopped. Thus, the title device can be used for a radio control device of a crane, etc., and when a serious danger such as the malfunction due to the noise exists, since it can be forcibly made into a stopped condition, it can be safely used. |
