There are no RFID readers that operate at 62.5 kHz. The common frequencies used are 125 kHz, 13.56 MHz and 915 MHz. I reached out to James Heurich, the president of of RFID Inc., who says that years ago, a company called Indala used to offer a low-frequency (LF) system that divided the frequency in half for frequency shift keying, a method for tag-to-reader communication. That is most likely the system you have.
—Mark Roberti, Founder and Editor, RFID Journal
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