| 摘要 |
PURPOSE:To enable likage between relay station groups without addition of a radio equipment in addition. CONSTITUTION:When a transmission output is interrupted due to a fault of a base station 1, since a reception input level detected by a detection circuit 5 reaches a prescribed level or below, a control circuit 6 increases a transmission output level of a power amplifier 10, changes a frequency of a voltage controlled oscillator 25 into a frequency used to demodulate a signal from a relay station 14 and a switch 7 is switched to select a signal from a band pass filter 20. The control circuit of the relay station 14 implements similar control. As a result, a relay station 3 receives a signal from the relay station 14 and the reception signal is inputted to a band pass filter 20 through circulators 12, 13. The reception signal passing through the filter 20 is inputted to a demodulator 8 through the switch 7 and the demodulator 8 demodulates the signal based on the frequency signal from the oscillator 25. That is, the relay stations 3, 14 are linked not through the base station 1. |
