If you are using a RadioLinx RLXIB-IHW radio with firmware revision 2.073 and set it to operate at 5GHz, there is a known issue in this version of firmware that causes the transmit power to drop to 0dB. The solution is to load an earlier firmware version, 1.011; or, upgrade to firmware versions later than 2.073, once they become available. You can find version 1.011 or newer versions of the firmware on the RLXIB-IHW product webpage.