|WSPR - Weak Signal Propagation Reporter - is frequently|
used on 630 meters to help with propagation research.
The "sliver" band is open to all hams in some countries as well as a limited number of US amateurs operating under experimental licenses. The FCC proposed a secondary allocation for US hams nearly two years ago but has not yet issued a final ruling. CQ will begin publishing a quarterly column on 630-meter and 2200-meter operating in the April 2017 issue.