ACT-31DH is a single-channel, block coded

ACT-31DH is a single-channel, block coded, TRANS PROX, key ring transmitter and 26- bit wiegand HID- compatible proximity tag used with Linear’s access control products. Block coded transmitters are programmed with Megacode format and are programmed with a sequential series of transmitter ID codes.

Looking to clone my remote can anyone help. I am very new to this.

Is it rolling code? If not you may find this thread interesting.