Comnav SinoGNSS T300 and N3 are not compatible when working in internal radio mode because they use different radio technology. However, they can work together in external radio mode. In this tutorial, we show you how to pair your N3 receiver with your T300 receiver using CDL 7 external radio. If what you have is CDL 5, then your N3 will be your base and T300 will be your rover.