| 摘要 |
PROBLEM TO BE SOLVED: To prevent consecutive transmission that is a malfunction of a wireless unit even on the occurrence of a fault in the wireless unit and a press circuit of a controller connected to the wireless unit. SOLUTION: The continuous transmission prevention device of this invention that stops transmission when a consecutive transmission time reaches a setting time or over is placed between the wireless unit and an antenna. The continuous transmission prevention device is provided with a directional coupler that detects a transmission output, a timer, a timer control circuit that is placed between the timer and the directional coupler and starts the timer when detecting a transmission output, and a coaxial relay that is connected to the timer and interrupts the connection between the antenna and the wireless unit when the consecutive transmission timer reaches the setting time or over.
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