Motorola is updating their RDX Series business two way radios for full narrowband compliance, starting with the RDU2080d. You can read all about it here.
This article features a new video hosted by Danny at Buy Two Way Radios. He explains three ways to upgrade your existing RDX radios for narrowband and shows how to perform the upgrade directly from the keypad of an RDU2080d, RDV2080d or RDU4160d radio.