| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0MD | 84 | 29.07 % | | 85 | 29.11 % | | 2 | C D C C C | K0BEE | 57 | 19.72 % | | 57 | 19.52 % | | 3 | C C D C C C | KA2FIR | 56 | 19.38 % | | 56 | 19.18 % | | 4 | C C D C | AC0W | 53 | 18.34 % | | 53 | 18.15 % | | 5 | C C D C C | AA0AJ | 36 | 12.46 % | | 38 | 13.01 % | | 6 | C D C | K3B | 2 | 0.69 % | | 2 | 0.68 % | | 7 | C C D C / C C D | AE4X/KP4 | 1 | 0.35 % | | 1 | 0.34 % | |
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