Ah....I noticed the CW FREQ setting, but did not realize that meant the same thing as "CW" in the ham radio world. So perfect, my radio receiver is calibrated to about 0.1 ppm at 15 MHz, so that will be a nice way to check the nanoVNA. All that said, I have no actual need for that much accuracy with it. I'd be happy to know it's within, say, 0.5 MHz at 100 Mhz....which would be 5000 ppm (!).
