| 摘要 |
PURPOSE:To attain automation easily in a master station having many local stations by using an adaptive equalizing signal obtained at the reception of a transmission signal from the master station to execute the automation of the transmission signal to the master station. CONSTITUTION:At the transmission from the master station (central station) 201 to a local station (general station) 202, a trouble of radio wave is generatd by a reflector 401 and a distorted signal is received, but a controller 311 turns the 1st switch 303 to the demodulator 302 side and turns the 2nd switch 306 to the discriminator 307 side to generate a signal turning an automatic equalizer 305 to adaptive status. Consequently, the automatic equalizer 305 changes the characteristics in accordance with the status of the transmission line. In case of transmitting from the local station 202 to the master station 201 after switching transmission/reception, the controller 311 turns the 1st switch 303 to the transmission signal generator 304 side and turns the 2nd switch 306 to the modulator 309 side. Thus, the characteristics of the automatic equalizer 305 are fixed and can be used at the transmission. |
