have been briefly allowed, such as XA5T, XB9Z, and XE0DX during major amateur radio contests. 4C1ASM was used by the Asociación de Scouts de Mexico (Mexican Scouts Association) during the Jamboree on the Air JOTA for some years. 6H1 also replaced the XE1 prefix, 6I2 replaced the XE2 prefix, and 6J3 replaced the XE3 prefix. 6E4 replaced XF4 for the Revillagigedo island group. See also Amateur radio international operation Call signs ITU prefix – amateur and experimental stations Amateur radio license External links Federal Telecommunications Institute FEDERACION MEXICANA DE RADIO EXPERIMENTADORES, A.C. – FMRE, Mexico's national organization for amateur radio (in Spanish) References Mexico Communications in Mexico Mass media in Mexico