| 摘要 |
PROBLEM TO BE SOLVED: To permit a master set to connect respective slave sets to respective external lines so that they can make communicate with simple control without switching transmission/reception by making communication between the transmis sion parts of the respective master sets and the reception parts of the respective slave sets and communication between the transmission parts of the slave sets and the reception parts of the respective master sets with different frequencies. SOLUTION: The second slave set 135 receives information which the master set 10 transmits by a transmission slot Tb after hop time passes in a reception slot Rb. At that time, the master set 10 transmits a frame constituted of hop time and the transmission slot Tb to the second slave set 135 as one unit and the second slave set 135 receives the frame constituted of hop times and the reception slot Rb from the master set 10 as one unit. The master set 10 synthesizes the transmission signal of the transmission slots Ta and Tb in a synthesizer and transmits it from an antenna through a transmission/reception separation unit. At that time, the transmission signal of the transmission slot Ta is a frequency band A and the transmission signal of the transmission slot Tb is a frequency band B. Then, they are not overlapped and therefore the transmission signal is prevented from being damaged in the synthesizer. |
