Relay apparatus

摘要

While a spectrum waveform of an output signal from a subtracter ( 207 ) is visibly monitored, an operator controls a variable phases shifter ( 208 ) based upon a second control signal (CL 2 ) so that a shape of a spectrum waveform of an output signal from a subtracter ( 207 ) is approximated to a spectrum waveform of a desirable wave to change a phase of a local oscillation frequency signal from a local oscillator ( 206 ). As a result, a phase of a duplicated loop signal is changed. Also, the operator controls a variable attenuator ( 209 ) based upon a first control signal (CL 1 ) so that a shape of this spectrum waveform is approximated to a spectrum waveform of a desirable wave ( 20 ) to change a signal level of the duplicated loop signal.