Abstract
We present a very effective, low-cost spectrum analyzer, built entirely from commercially available standard laboratory equipment. A broadband radio frequency synthesizer is used as the local oscillator input of a double-balanced diode mixer to convert the high-frequency input signal into the intermediate-frequency output of the mixer, a lower-frequency signal which is analyzed in an audio-frequency spectrum analyzer. The overall performance depends on the specifications of the frequency synthesizer, the mixer, and the spectrum analyzer. Our instrument has a resolution bandwidth of 1 Hz in the 0.1–1000-MHz frequency range with a −139-dBm sensitivity for the smallest bandwidth. Especially the single-hertz resolution bandwidth is an essential feature of our spectrum analyzer, not yet commercially available.
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