In July 2003, radio amateurs in the US received secondary privileges on 60 meters. Its strict guidelines -- no CW, operation just on five distinct channels using USB, a maximum effective radiated power of 50 W and only open to General, Advanced and Amateur Extra class licensees -- have prevented it from being popular. At first, amateurs interested in operating on 60 meters had to make modifications to the radios in use at the time. But now, more rigs are available that are designed to operate on 60 meters directly, or with a simple manipulation of menus.
Over time, radio amateurs heard various signals on the channels; users assumed these signals were those of government users and protected as such. Normally, advice to amateurs is to “use it or lose it” in regard to band usage, but on 60 meters, the watchword seemed to be “misuse” the band and lose it. So amateurs were cautious and compliant and when the band was made available to radio amateurs, users reported that everyone on the band was friendly and courteous, with at least one amateur reporting “that it was the way all the other bands used to be.”
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For more information on 60 meters, please check out the 60 Meters FAQ page on the ARRL website.