초록 ▼

A standing wave ratio detecting apparatus comprising a first comparator for comparing a traveling wave detection signal with a sawtooth or triangular wave signal having an amplitude proportional to the traveling wave detection signal to generate a first pulse signal, a generator receiving the first

A standing wave ratio detecting apparatus comprising a first comparator for comparing a traveling wave detection signal with a sawtooth or triangular wave signal having an amplitude proportional to the traveling wave detection signal to generate a first pulse signal, a generator receiving the first pulse signal to generate the sawtooth or triangular wave signal, a second comparator for comparing the sawtooth or triangular wave signal with a reflected wave detection signal to generate a second pulse signal having a duty cycle representative of the standing wave ratio and a meter device for averaging out the second pulse signal and indicating the averaged value. By this construction determination of the standing wave ratio is facilitated without troublesome operation.

대표청구항 ▼

An apparatus for measuring the standing wave ratio of a line, comprising a traveling wave detector circuit coupled to said line for producing a traveling wave detection signal by detection of the traveling wave on the line, and a reflected wave detector circuit coupled to said line for producing a r

An apparatus for measuring the standing wave ratio of a line, comprising a traveling wave detector circuit coupled to said line for producing a traveling wave detection signal by detection of the traveling wave on the line, and a reflected wave detector circuit coupled to said line for producing a reflected wave detection signal by detection of the reflected wave on said line; wherein the apparatus further comprises first means connected to said traveling wave detector circuit for generating a reference signal to be compared with said traveling wave detection signal and with said reflected wave detection signal, said first means including comparing means for comparing said traveling wave detection signal and said reference signal and for producing a pulse signal when one of the compared signals is larger than the other, reference signal generating means connected with said comparing means for generating said reference signal upon reception of said pulse signal from said comparing means and means for feeding the output of said reference signal generating means back to the input to said comparing means, said reference signal having a waveform consisting of a positive going linear ramp and a negative going linear ramp and having a maximum value proportional to the amplitude of said traveling wave, second means connected to said first means and said reflected wave detector circuit for comparing the amplitude of the reference signal produced from said first means with the amplitude of the reflected wave detection signal produced from said reflected wave detector circuit, said second means generating a pulse signal having a duty cycle substantially equal to the ratio of the amplitude of said reflected wave signal to the amplitude of the traveling signal, and third means connected to said second means for taking the average of said pulse signal produced from said second means, said third means indicating a standing wave ratio in response to said output of average value.