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Let's try making a digital SINAD meter

The tinySA Ultra has an SG function. I want a DIY SSD meter to measure the receiver's sensitivity.

nobchanobcha
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Background and Motivation
It started with a small surprise.
My nanoVNA has a built-in signal generator function. One day I realized: if I have a calibrated RF source right there on my bench, why not use it to measure receiver sensitivity properly? That question set everything in motion.
Receiver sensitivity measurement has a surprisingly fragmented history. However we can use SINAD practically. This tiny digital SINAD indicator shall be useful for my test bench.

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