| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0ACP | 512 | 38.24 % | | 572 | 36.11 % | | 2 | C C D C C C | KA0DOS | 341 | 25.47 % | | 358 | 22.60 % | | 3 | C D C C | K0DG | 226 | 16.88 % | | 272 | 17.17 % | | 4 | C C D C C | AA0PK | 149 | 11.13 % | | 169 | 10.67 % | | 5 | C C D C | AA9L | 70 | 5.23 % | | 79 | 4.99 % | | 6 | C D C | K0M | 37 | 2.76 % | | 46 | 2.90 % | | 7 | C D C C C / C C | K8ALB/AX | 1 | 0.07 % | | 1 | 0.06 % | | 8 | C C D C C C / C C D C C KD8GUA/KF8BHR | 1 | 0.07 % | | 1 | 0.06 % | | | 9 | C D D C C | N50GW | 1 | 0.07 % | | 1 | 0.06 % | | 10 | C C D C C D | WB9FD2 | 1 | 0.07 % | | 1 | 0.06 % | |
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