M17 repeater
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An M17 repeater can be built using readily available hardware.
MMDVM-based multimode repeater
Two radios are required, along with a controller board, duplexer, and an antenna.
A guide written by Rob K9OJ is here: https://robrobinette.com/Ham_VHF-UHF_Digital_Modes.htm#Building_an_M17_Repeater