| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AMY | 166 | 26.82 % | | 178 | 25.46 % | | 2 | C D C C | K0AD | 148 | 23.91 % | | 179 | 25.61 % | | 3 | C C D C C C | DA0LCC | 134 | 21.65 % | | 142 | 20.31 % | | 4 | C C D C C | AA0FO | 89 | 14.38 % | | 102 | 14.59 % | | 5 | C C D C | AA3B | 81 | 13.09 % | | 97 | 13.88 % | | 6 | D C D C C | 4U1WB | 1 | 0.16 % | | 1 | 0.14 % | |
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