| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 265 | 39.55 % | | 476 | 43.00 % | | 2 | C C D C | AA3B | 129 | 19.25 % | | 214 | 19.33 % | | 3 | C D C C C | K0ACP | 113 | 16.87 % | | 173 | 15.63 % | | 4 | C C D C C | AA0AW | 92 | 13.73 % | | 142 | 12.83 % | | 5 | C C D C C C | KA1IOR | 61 | 9.10 % | | 84 | 7.59 % | | 6 | C C D C / D | AI0Y/9 | 2 | 0.30 % | | 4 | 0.36 % | | 7 | C D C | K5O | 2 | 0.30 % | | 6 | 0.54 % | | 8 | D C D C | 8P5A | 1 | 0.15 % | | 2 | 0.18 % | | 9 | C D C C / C C D | K2NV/VE3 | 1 | 0.15 % | | 2 | 0.18 % | | 10 | C C D C C / D | AB5ZA/7 | 1 | 0.15 % | | 1 | 0.09 % | | 11 | C D C C / D | N4DL/0 | 1 | 0.15 % | | 1 | 0.09 % | | 12 | C D C C C / D | W4ZGR/1 | 1 | 0.15 % | | 1 | 0.09 % | | 13 | C D / C D C C C | W8/G4DJX | 1 | 0.15 % | | 1 | 0.09 % | |
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