| 摘要 |
PURPOSE: An apparatus for measuring a voltage standing wave ration in a multi-FA(Frequency Assignment) transmitter is provided to measure the voltage standing wave ration corresponding to each FA using an encryption code signal of a control unit and an FA signal detector. CONSTITUTION: An amplifying unit(22) amplifies a frequency and power of a multi-FA system(21). A coupler(11) couples a part of a transmission signal of the amplifying unit(22) or couples a part of a reflective signal. A signal selecting unit(23) selects and outputs the reflective signal and a forwarding transmission signal by a control signal. A mixing unit(24) mixes an output frequency of the signal selecting unit(23) with a uniform frequency, and outputs the mixed frequency. An FA signal detecting unit(25) converts an analog output signal of the mixing unit(24) into a digital signal, receives the encryption code signal, and detects a desired FA. A sensing unit(26) converts the digital output signal of the FA signal detecting unit(25) into an analog signal, and senses powers of the forwarding transmission signal and the reflective signal. A control unit(27) converts the analog output signal of the sensing unit(26) into a digital signal, measures a power of the reflective signal or a transmission signal, and compares the digital signal with the power. The control unit(27) measures a voltage standing wave ratio, outputs an encryption code signal and a control signal, and controls the FA signal detecting unit(25) and the signal selecting unit(23).
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