NAC
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NAC e. Nordic Activity Contest e. Aktiivsustest
The Nordic Activity Contest (NAC) started back in the fifties (1954?) It started locally in Skåne on 144 MHz and has developed ever since. (The rules are not static)
The NAC Open Class was started in 1989 to encourage activity outside the traditional Nordic countries, and organized by the EDR (Danish Ham Radio Organization) ever since.