| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0CRA | 46 | 35.11 % | | 50 | 36.23 % | | 2 | C D C C | F5IN | 32 | 24.43 % | | 34 | 24.64 % | | 3 | C C D C C | AA5DX | 17 | 12.98 % | | 17 | 12.32 % | | 4 | C C D C C C | KB0MOE | 17 | 12.98 % | | 17 | 12.32 % | | 5 | C C D C | AK9D | 15 | 11.45 % | | 15 | 10.87 % | | 6 | C D C | K5K | 4 | 3.05 % | | 5 | 3.62 % | |
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