VARIABLE POWER TRANSMITTER/RECEIVER

摘要

PROBLEM TO BE SOLVED: To provide a transmission path structure in which variation range of transmission power can be increased without sacrifice of S/N ratio. SOLUTION: Since a transmitter or a transmitter/receiver has a transmission path structure, variation range of transmission power can be increased without sacrifice of S/N ratio. Attenuation is achieved partially in an internal unit 5 and achieved partially in an external circuit 4 comprising a switching circuit 25 being connected with an antenna 2 by shorting an amplifier 20.