| 摘要 |
PURPOSE:To return the titled device to the waiting operation for a starting control channel by resetting automatically a radio equipment after a time set shorter than a speech limit time is elapsed even when a reset button is left unpressed after calling. CONSTITUTION:When an automatic reset switch 24 is turned on, a short-time reset mode wherein a switch 16 is off and a switch 22 is on is entered with the control signal from a switch control circuit 23. When a speech signal is inputted from an opponent station, a reception part input signal becomes larger than a threshold value, no signal appears at the output side of a decision circuit 20, and a 10sec timer 21 does not operate. On the other hand, if an operator forgets to press the manual reset button although transmission is completed, the reception part input signal decreases below the threshold value and a signal appears at the output side of the decision circuit 20 on the basis of the output of a squelch circuit 12. Consequently, the 10sec timer 21 operates to perform automatic resetting operation a specific time later, and a timer signal is inputted to a resetting PLL data generating circuit 18. |
