MULTIIDIRECTION AND MULTIPLEX RADIO COMMUNICATION SYSTEM

摘要

PURPOSE:To ensure the effective use of the frequency by securing the synchronization of the frequency relationship between the master station and the slave stations through the control given by the reference frequency signal provided at the master station. CONSTITUTION:Reference frequency signal f sent from reference frequency signal oscillator 11 of the master station is applied to converter circuits 12-O-12-X to generate the carriers featuring the relation of f.nOW-f.nX(nOW-nX: positive integers). Carriers fOW-fX are then inserted to modulators 13-O-13-X each and receive the frequency conversion by local oscillation signal fr1 after modulation given with each channel signal to be then sent out through antenna 17. The signals of the master station received at slave station x receive the frequency conversion by reception local oscillation signal fR2, and carrier fOW' of the order signal and carrier fX' of channel x are extracted via carrier regenerators 26 and 27 and through distributor 23. The extracted carriers fOW' and fX' obtain division signals f' and f'' of fOW'/nOW and fX'/nX to then apply them to phase comparator 30. And then fr2 is controlled by the difference signal produced from comparator 30.