yan 🐇random n00by question: say that i have a key card and already determined that it's not NFC. what's the easiest way to figure out what protocol it is using? assuming it is passive RFID, is there a DIY way to read it (like with an SDR)?
MMN-o ✅⃠If it's not 13.56MHz (Mifare, NDEF, ISO14443) I'd guess it's 125kHz (easily clonable, EM4102).
How did you conclude it was not NFC?