| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 407 | 41.79 % | | 636 | 43.35 % | | 2 | C C D C | AA0Q | 177 | 18.17 % | | 279 | 19.02 % | | 3 | C D C C C | F5SGI | 161 | 16.53 % | | 227 | 15.47 % | | 4 | C C D C C | AA0AI | 131 | 13.45 % | | 193 | 13.16 % | | 5 | C C D C C C | HA1DAE | 93 | 9.55 % | | 126 | 8.59 % | | 6 | C D C C C / D | K8RGI/4 | 2 | 0.21 % | | 2 | 0.14 % | | 7 | C C D C / D | AI0Y/9 | 1 | 0.10 % | | 2 | 0.14 % | | 8 | C D C C / D | K2ZR/4 | 1 | 0.10 % | | 1 | 0.07 % | | 9 | C C D C C / C D | KH6XX/W0 | 1 | 0.10 % | | 1 | 0.07 % | |
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