| 摘要 |
PURPOSE:To attain excellent communication without radio interferential disturbance by incorporating a synthesizer respectively to a base station radio equipment and each portable radio equipment and setting the operating frequency and a spare frequency in advance. CONSTITUTION:A carrier in frequencies f1-f8 sent from a or table radio equipment 20 is received by an antenna 14 of a radio base station 10, the carrier is received by a receiver 11 to a frequency of each portable radio equipment 20 to listen to the sound through a speaker 13 via a sound mixing circuit 12. The base station 10 sends a command in a frequency F1 by a microphone 15 to each portable radio equipment 20. Each portable radio equipment sets in advance other transmission frequency against the incoming an external disturbance radio wave such as f9 for the portable radio equipment 20a and f10 for the equipment 20b, f16 for the equipment 20h. Spare channel frequencies F2 are set for the transmission frequencies from the base station 10 against the interferential disturbance. |
