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Which of the following is not used in the VSWR measurement?

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Which of the following is not used in the VSWR measurement?

(a) Reflective Klystron

(b) Slotted line

(c) Frequency meter

(d) Spectrum analyzer

The question was asked in an online interview.

The question is from Standing Wave Ratio Method topic in section Modern Antennas & Antenna Measurements of Antennas

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The correct answer is (d) Spectrum analyzer

Explanation: Spectrum analyzer frequency domain instrument and is contrast to the oscilloscope which displays in time domain. The Klystron acts as a microwave source and the by moving the slotted line the maximum reading on the meter is observed. For high VSWR the frequency of operation is noted using the frequency meter.

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