The Commission is working to resolve interference to Terminal Doppler Weather Radar (TDWR) systems used at airports that has occurred from some outdoor wireless systems operating in the 5.4 GHz (5470 MHz - 5725 MHz) band. These wireless devices are required to implement radar detection and DFS functions when operating as a master device and are subject to Section 15.407 of our rules. We are working with the FAA and NTIA to develop long term equipment authorization test procedures that will ensure that the devices comply with our rules and also protect the TDWR operations. In the interim, the Commission will allow certification of wireless master devices with radar detection function and with DFS capability, if they meet the following conditions:

- devices are intended for indoor operations only;
- devices will not permit operations on channels which overlap the 5600 - 5650 MHz band;
- devices meet all the other requirements specified in Section 15.407 and no configuration controls are  provided to change the frequency of operations outside the grant of certification for US operation.

  All the devices operating in the 5.4 GHz band and subject to the DFS requirements must be submitted to the Commission's Laboratory Division for pre-grant testing and equipment authorization. The grantee must ensure that the applications subject to this interim procedure must include appropriate attestations that the device is intended for indoor use (through a clear indication in a manual or labels with the device) and must demonstrate through test reports that the transmission is disabled in the 5600 - 5650 MHz band.