for this to work the radios TYT TH-9000D and RT9000D needs the DB9 kit (also called Repeater cables) installed, this is NOT installed when you buy the radio!
You can buy the repeater cable here:
https://www.gmrstwowayradio.com/store/p ... er-cables/
video on how to install the cable:
https://youtu.be/DC2IrN1lxXA?si=KJ4d6ngJp6-FWCDs
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