20 Dec '15, 6pm

No Spectrum Analyser? No Problem!

I agree with you about dynamic range. I’m used to seeing the noise floor drop by 10 dB when you decrease the resolution bandwidth by a decade. In the example on the video, the noise floor stays about the same when he switches from a bandwidth of about 3 kHz to 190 Hz. So you’re not going to see any signals “down in the dirt” looking at a DSO-based spectrum display. But even before you consider dynamic range, what about basic frequency range? One of the big advantages of “bad old days” spectrum analyzers was their bandwidth. In the days when oscilloscopes were limited to about a gigahertz and most lab-grade scopes topped-out somewhere between 100 and 300 MHz, there were spectrum analyzers that could do 20 GHz into the front panel connector, or hundreds of GHz using external mixers. Sure, you can get upwards of 20 GHz oscilloscopes (or “mixed-signal” instruments that are bas...

Full article: http://hackaday.com/2015/12/20/no-spectrum-analyser-no-pr...

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