| 摘要 |
PURPOSE:To simplify and economize devices of respective transmitting/receiving stations, by arranging a means to detect an error from the reference value of receiving frequency transmitted from a repeater station on one place and transmitting the error information to respective transmitting/receiving stations. CONSTITUTION:An output received from a transmitting/receiving circuit 11 in a transmitting/receiving station 1 is extracted at its receiving carrier by a carrier reproducing circuit 12 and compared with the output of a reference oscillator 14 by a comparator 13. The error output is impressed to an oscillator 17 in the transmission station part through an amplifier circuit 15 to control the error automatically so as to be minimized. A control signal Sc is inputted to a terminal 18 and digitally converted in a modulator 19 by an error signal and the digital signal is transmitted to other transmitting/receiving stations 2-1, 2-2 through a mixing circuit 16, the transmitting/receiving circuit 11 and a repeater 3. Respectively transmitting/receiving stations 2-1, 2-2 correct the transmitted carrier frequency of the transmitting means in their self-stations in accordance with the transmitted error signal. |
