| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 367 | 40.37 % | | 604 | 42.75 % | | 2 | C C D C | AA0U | 165 | 18.15 % | | 254 | 17.98 % | | 3 | C D C C C | K0GEO | 157 | 17.27 % | | 224 | 15.85 % | | 4 | C C D C C | AA0AO | 116 | 12.76 % | | 183 | 12.95 % | | 5 | C C D C C C | KA0CSW | 89 | 9.79 % | | 124 | 8.78 % | | 6 | C D C | K4O | 6 | 0.66 % | | 11 | 0.78 % | | 7 | C C D C / D | AI0Y/9 | 4 | 0.44 % | | 5 | 0.35 % | | 8 | C D C C / C C D | K3WA/KP4 | 1 | 0.11 % | | 2 | 0.14 % | | 9 | C D C C C / D | K8RGI/4 | 1 | 0.11 % | | 1 | 0.07 % | | 10 | D C D C C | 4U1WB | 1 | 0.11 % | | 1 | 0.07 % | | 11 | C C D / C C D C | VP5/KM3T | 1 | 0.11 % | | 3 | 0.21 % | | 12 | C D C C / D | W9OA/9 | 1 | 0.11 % | | 1 | 0.07 % | |
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