How to Diagnose and Fix Everything Electronic by Michael Geier

Author:Michael Geier
Language: eng
Format: epub, pdf
Publisher: McGraw-Hill Education
Published: 2016-05-01T16:00:00+00:00

SDR: By the Numbers

While the operation of an SDR receiver is quite complex, most of the action occurs in software, so you’ll never see it or have anything to fix. As I mentioned earlier, many SDR receivers used in consumer devices have an RF preamplifier to get the incoming signal strong enough to be digitized, and then a big DSP chip with some supporting components. That’s it! SDRs made for satellite reception and other frequency bands too high for direct digital conversion are more like superhets, with a front-end RF amp, a digitally tuned local oscillator and a mixer. There might even be some IF stages. Then, the preselected band of down-converted frequencies goes to the DSP, where the fancy math is applied, and out comes the audio or data. Those are really hybrids, part superhet, part SDR, and will look more like superhets on paper, except for that big chip on the end.

I haven’t included an SDR schematic here because there are so many varieties that there’s no “typical” SDR. If your receiver has nothing more than a transistor or two and maybe a few coils feeding a big chip, it’s a safe bet you’re looking at an SDR.

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