| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | KA0BOJ | 326 | 26.33 % | | 371 | 23.36 % | | 2 | C D C C C | K0ARY | 324 | 26.17 % | | 379 | 23.87 % | | 3 | C D C C | K0EA | 254 | 20.52 % | | 378 | 23.80 % | | 4 | C C D C C | AA0AI | 168 | 13.57 % | | 219 | 13.79 % | | 5 | C C D C | AA0O | 155 | 12.52 % | | 227 | 14.29 % | | 6 | C C D C C C / C C | KI5BMS/AG | 2 | 0.16 % | | 2 | 0.13 % | | 7 | C D C C / D | N5AW/0 | 2 | 0.16 % | | 3 | 0.19 % | | 8 | D C D C C | 4U1WB | 1 | 0.08 % | | 1 | 0.06 % | | 9 | C C / C D C C C | CT/G4URG | 1 | 0.08 % | | 1 | 0.06 % | | 10 | C D C C C / C C | K7WWR/AE | 1 | 0.08 % | | 1 | 0.06 % | | 11 | C D C C C / C | N0SRF/M | 1 | 0.08 % | | 1 | 0.06 % | | 12 | C C D C / D | NE8O/4 | 1 | 0.08 % | | 1 | 0.06 % | | 13 | C D C | W1N | 1 | 0.08 % | | 3 | 0.19 % | | 14 | C D C C / C | W9II/M | 1 | 0.08 % | | 1 | 0.06 % | |
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