23-centimeter band

[3] The 23cm band was born after the World War II, at the International Radio Conference celebrated in Atlantic City, in 1947.

In the 1979 World Administrative Radio Conference held in Geneva (WARC-79), the band was reduced to 1240 - 1300 MHz and downgraded to secondary allocation for amateur use.

Frequencies in the 23 cm band are harmonized by International Telecommunication Union region.

In 2008 the IARU Region-1 Cavtat Conference designated 1240.000-1240.750 MHz as an alternative centre for narrowband activity and beacons.

This is a mitigation for sharing with existing aviation radars and Primary users, or for potential issues with the European Galileo system.