| 摘要 |
PURPOSE:Not only to prevent deterioration of S/N but also to make it possible to confirm that a registration request has been received, by arranging so that 2 kinds of tone signals can be transmitted from the base station only when the registration request has been received from the moving unit, and one kind of tone signal can be transmitted in other case than the foregoing. CONSTITUTION:In case a moving unit of the group K executes a registration request when the base station is in course of talking with a moving unit of the group A, the moving unit of the group K transmits a tone signal of the registration request. The base station detects this registration request tone signal by the band filter BPFK, and when the logical circuit LGC has decided that it is a registration request, the control circuit CONT registers the group K in the memory MEM and outputs a registration request receiving response signal QK, by which both the tone signal FK and the lock tone signal are transmitted simultaneously for a short time. When a talking available period of the group A has been finished, contents of the memory MEM are read and the group selection signal SK is output, by which the tone signal FK is transmitted. |
