Does anyone have a schematic of the Sonmicro SM130 RFID board that can be shared? Failing that, can someone provide the component values for L1, L2, C15 and C16? Looking at the antenna-tuning spreadsheet found [HERE, I believe these correspond to the components shown as C0 and L0.Also in that spreadsheet, I’m not sure how “Rmatch (TX1 - TX2)” is measured or calculated.
Presumably, someone at Sparkfun had access to this information in order to design their [RFID Evaluation Shield.
Any other advice on how to tune my own hand-wound 13.56 MHz Mifare antennas would be appreciated.
Thanks,
Don P.](https://www.sparkfun.com/products/10406)](Redirect Notice)