| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0ACP | 391 | 28.58 % | | 505 | 28.34 % | | 2 | C C D C C C | IU8CNE | 355 | 25.95 % | | 426 | 23.91 % | | 3 | C D C C | K0EA | 246 | 17.98 % | | 346 | 19.42 % | | 4 | C C D C C | AA0AI | 193 | 14.11 % | | 242 | 13.58 % | | 5 | C C D C | AA3S | 168 | 12.28 % | | 246 | 13.80 % | | 6 | C C D C / D | AA7G/2 | 2 | 0.15 % | | 2 | 0.11 % | | 7 | C C D C C C / D | KB3MHY/3 | 2 | 0.15 % | | 2 | 0.11 % | | 8 | C D C C C / C | K4LJE/M | 2 | 0.15 % | | 2 | 0.11 % | | 9 | C D C C C / D | K8RGI/4 | 2 | 0.15 % | | 2 | 0.11 % | | 10 | C D D C | E31A | 1 | 0.07 % | | 1 | 0.06 % | | 11 | D C D C C | 4U1WB | 1 | 0.07 % | | 1 | 0.06 % | | 12 | D C D C | 8P5A | 1 | 0.07 % | | 1 | 0.06 % | | 13 | C C D C C / D | AB5ZA/7 | 1 | 0.07 % | | 3 | 0.17 % | | 14 | C C D C C C / C C | KM4YMI/AE | 1 | 0.07 % | | 1 | 0.06 % | | 15 | C C D C C C / C | WA4JYJ/M | 1 | 0.07 % | | 1 | 0.06 % | | 16 | C C D C C / C | WX9HV/M | 1 | 0.07 % | | 1 | 0.06 % | |
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