Over the past few weeks I have been working on attempting to migrate from MIFARE Classic cards to DESFire EV2 cards. I have been having a lot of detection issues with the DESFire EV2 cards.
When going through the initial anti-collision process for both cards, the Classic cards seem to have a much better range than the EV2 cards. EV2 cards are sometimes never detected, especially when the center of the card is placed near the antenna. Is there a reason for this?
Using a spectrum analyzer, the resonance of the DESFire Card seem to be off tuned from 13.56 MHz (16-17 MHz). Is there a way to change the tuning of the DESFire cards? Or purchasing ones that are tuned properly?
I am considering trying the DESFire Light cards instead, as I only need a single application; but I am afraid they will have he same issue.