Hi. It seems to me that you don't fully understand the tethers, so i'll share what i know for sure. Tether cables are just used to navigate the robot around... its for saftey purposes in small areas, as well as transport over longer distances. The tether port allows the conrol interface to be powered off of the robot's battery and allows for direct communcation. That means you don't need any plugs, radios, or excess controllers. Just plug one joystick into your port 1 and you're good to go. You vets correct me if i'm wrong.
~Bobb
Team 804