PREVENTING SYSTEM OF SENSITIVITY SUPPRESSION

摘要

PURPOSE:To make a stable, fine adjustment for interference prevention by applying a radio wave from one antenna to the other antenna through a cable when there are plural near-by stations of near-by frequencies. CONSTITUTION:A cable is utilize to lead out part of signal electric power of frequency f1 sent from a transmission part T1 to an antenna A1 through a directional coupler C1 and to apply it to the line connecting an antenna A2 and a reception part R2 together by a directional coupler C2 through a phase shifter and attenuator D1. The phase-shifting and attenuating extents of the phase shifter and attenuator D1 and the extent of coupling between the directional couplers C1 and C2 are so determined that the applied signal cancels the signal that the antenna A2 receives the radio wave f1 to send to the reception part R2. Consequently, the adjustment for interference prevention is made very widely and finely.