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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.
Frequencies of note
CW and SSB calling frequency is 1296.1 MHz.
FM simplex calling frequency is 1294.5 MHz.
FM Simplex Calling Frequency is 1294.0 MHz (VK Australian band-plan 2007)