| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 270 | 41.35 % | | 470 | 44.72 % | | 2 | C C D C | AA3B | 124 | 18.99 % | | 198 | 18.84 % | | 3 | C D C C C | K0DTJ | 95 | 14.55 % | | 145 | 13.80 % | | 4 | C C D C C | AA0AJ | 89 | 13.63 % | | 143 | 13.61 % | | 5 | C C D C C C | CO2RSK | 71 | 10.87 % | | 90 | 8.56 % | | 6 | C C D C C / D | AB5ZA/7 | 1 | 0.15 % | | 1 | 0.10 % | | 7 | D C D C | 8P5A | 1 | 0.15 % | | 1 | 0.10 % | | 8 | C D C | N6N | 1 | 0.15 % | | 2 | 0.19 % | | 9 | C D C C / D | W1AW/0 | 1 | 0.15 % | | 1 | 0.10 % | |
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