| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0VW | 153 | 26.56 % | | 283 | 28.94 % | | 2 | C D C C C | A3ROC | 120 | 20.83 % | | 192 | 19.63 % | | 3 | C C D C | AA3B | 113 | 19.62 % | | 195 | 19.94 % | | 4 | C C D C C C | CO8NMN | 111 | 19.27 % | | 172 | 17.59 % | | 5 | C C D C C | AA2GF | 76 | 13.19 % | | 128 | 13.09 % | | 6 | C C D C / D | AI0Y/9 | 1 | 0.17 % | | 4 | 0.41 % | | 7 | C D C C C / D | K6DTT/1 | 1 | 0.17 % | | 3 | 0.31 % | | 8 | C D C C / D | K6NR/7 | 1 | 0.17 % | | 1 | 0.10 % | |
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