| 摘要 |
PROBLEM TO BE SOLVED: To allow a slave set to receive stably the service of a base station and a master station by matching a reference frequency of the master set with a reference frequency via the slave set even when the master set is resident in a dead band of the cellular base station. SOLUTION: A control mode designation section 47 of a slave set receives a transmission signal of a cellular base station at initializing and designates a mode of adjusting a reference frequency to a control voltage calculation section 44 and then the oscillated frequency of a reference oscillator 45 is adjusted. On the other hand, when the master set cannot receive a transmission signal from the base station at initializing, a reception signal discrimination section 39 discriminates it and a control mode designation section 37 receives a transmission signal from the slave set to designate the mode of adjusting the reference frequency to a control voltage calculation section 34 and then a reference oscillator 35 is adjusted. Thus, even when the master set is resident in a dead band of the base station, the slave set surely receives the service by the master station and the base station. |
