United States
There is no 136 kHz amateur allocation in the United States. In 1998, the Federal Communications Commission rejected an ARRL petition for LF allocations at 135.7–137.8 kHz and 160–190 kHz. In 2002, indications from the FCC had been that 136 kHz privileges would be authorized soon. On May 14, 2003, however, the FCC declined to grant these privileges citing concerns over potential interference with power line communications (PLC) systems operating unlicensed under Part 15 used by electrical utilities to control the power grid. The FCC added that amateurs wishing to experiment with 136 kHz communications may apply for a Part 5 Experimental License or operate under Part 15 regulations for this part of the electromagnetic spectrum. In the case of Part 15, the field strength measured 300 meters from the antenna may not exceed 2400 microvolts per meter divided by the frequency in kilohertz, or approximately 17 μV/m.
On November 19, 2012, the FCC issued a Notice of Proposed Rulemaking demonstrating intent to authorize the amateur service as a secondary user of the LF band between 135.7 and 137.8 kHz with a maximum EIRP of 1 W. The notice seeks to reexamine the 2003 rejection citing the international allocation of the band in all ITU regions by WRC-07 and the lack of use by the primary allocation holders. The notice seeks further comment and empirical evidence regarding interference to PLC systems based on data collected by experimental licenses granted in the United States and by other stations around the world.
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