In September 2006, the FCC’s Office of Engineering and Technology granted a Part 5 experimental license -- WD2XSH -- to the ARRL on behalf of a group of radio amateurs who were interested in investigating spectrum in the vicinity of 500 kHz. Called the ARRL 500 kHz Experiment, this group of hams -- led by Fritz Raab, W1FR -- received permission to experiment and do research between 505-510 kHz ...
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