In all the messages about the operation of C4A in the WPX, no one has mentioned the fact that these C4x (and P3x) callsigns do not comply with the Amateur Radio Callsign conventions. They should be at least C4nx and P3nx. Another one in the same vein is E7DX. Under the Cyprus rules, GA would be a good callsign 73 de Sid GM4SID