| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K1RK | 38 | 44.19 % | | 41 | 43.62 % | | 2 | C D C C C | K3CSG | 21 | 24.42 % | | 25 | 26.60 % | | 3 | C C D C C | AB5ER | 10 | 11.63 % | | 11 | 11.70 % | | 4 | C C D C | AA3B | 9 | 10.47 % | | 9 | 9.57 % | | 5 | C C D C C C | VE2FET | 4 | 4.65 % | | 4 | 4.26 % | | 6 | C D C | N6R | 3 | 3.49 % | | 3 | 3.19 % | | 7 | D C D C C | 7D1SJ | 1 | 1.16 % | | 1 | 1.06 % | |
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