But why would anyone want an RFID reader that can read cards over 10" away
My application is something like a bracelet antenna. Not spying. Lol. But as to the "short" calibration of the coil. According to an ST rep:
"The idea is to calibrate away the characteristics of the pickup coil, and be able to only sense the characteristic of the reader or tag antenna - since the antenna is still connected during the "short" calibration. A OSL calibration would only calibrate the VNA port + cable. The characteristic of the pick-up coil would overlap with the characteristic of the reader or tag antenna."
My nanoVNA has the OSL calibrations. And Through and Isolation calibrations. That's all. So, unless the "short" calibration of the coil can be arrived at via those and/or measurement methods, I guess I'm screwed.
tjackson382000