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Quote:
Originally Posted by nemo_07
]So you think you have measured the OPI3 for the MAR-1+ with this little-tiny-weeny toy made in China. And all this in a single step?
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I believe regenfreak was just sharing the results of an interesting experiment using an ultra low cost spectrum analyser. Many years ago, before I owned a spectrum analyser I did various experiments using a diode ring mixer and a sig gen and an early PC soundcard to try and do (narrowband) OIP3 measurements. I achieved reasonably good results, certainly good enough to be educational at least. There are times when you have to make do with what tools are available to hand and then always allow a good margin for overall measurement uncertainty.
I'd be interested to see more results with the TinySA as I'm still tempted to buy one. I'll probably use it for RFI sniffing around the house but any tests that show it can do more than this are very interesting to me.