23 centimeters is a common amateur radio band located in the UHF spectrum between 1240 and 1300 MHz.
Most all modes of communication used in amateur radio can be found in the 23 cm band. Some of the more common modes include FM voice, Packet, as well as ATV.
Band Charts are for general information, please check your local band plan for operating privlages.
For example; ARRL Band Plan
or RSGB Band Plan.
