| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0FX | 96 | 38.71 % | | 173 | 42.93 % | | 2 | C C D C | AA3B | 53 | 21.37 % | | 86 | 21.34 % | | 3 | C D C C C | F6HKA | 36 | 14.52 % | | 61 | 15.14 % | | 4 | C C D C C | AA4CF | 31 | 12.50 % | | 42 | 10.42 % | | 5 | C C D C C C | GW0GEI | 27 | 10.89 % | | 34 | 8.44 % | | 6 | D C D C C | 4Z4DX | 2 | 0.81 % | | 2 | 0.50 % | | 7 | C D C C C / D | K9QVB/9 | 1 | 0.40 % | | 2 | 0.50 % | | 8 | C D C C / C | N8SS/M | 1 | 0.40 % | | 1 | 0.25 % | | 9 | C C D C C C / C | OZ9EDR/P | 1 | 0.40 % | | 2 | 0.50 % | |
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