| 摘要 |
PURPOSE:To obtain a radiotelephony equipment which prevent the disturbance given to other handsets by deciding the outside of the control gange of the repeater and stopping the subsequent transmission in case the signals cannot be received from the repeater in a fixed time after hang-up. CONSTITUTION:When switch SW1 is turned on to hang up the handset shown in the figure, ratch FF is set and at the same time timer MM is triggered. As a result, transmission control circuit 9 transmits the hang-up signals through transmitter 3. When receiver 5 receives the signals from the repeater within a fixed time set by timer MM, signal detection circuit 8 generates the signals to hold the above mentioned transmission state. In case the reception of the signals from the repeater is impossible, the time-out output of MM resets ratch FF to release the transmission state. |
