The ARRL 600 Meter Experiment under the WD2XSH Part 5 Experimental license reports that no interference complaints have been received from other services operating in the 465-515 kHz band over the course of more than 202,400 hours of operation, nor was interference from other operations an issue for any of the experiment’s participants. That statistic was contained in the Experiment’s March 1 to May 31, 2016, report, prepared by Experiment Coordinator Fritz Raab, W1FR, with participants Rudy Severns, N6LF, and John Langridge KB5NJD, and released on July 3. Utilities’ expressed fears of interference to their unlicensed PLC systems prompted the FCC to consider regulatory provisions that include a possible notification requirement by some radio amateurs to utilities with systems in the pending 630 meter (472-479 kHz) and 2200 meter (135.7-137.8 kHz) bands, prior to operating. Utilities use unlicensed PLC systems to control parts of the electrical power grid.
Read more: http://bit.ly/29iYXcb