| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | CQ3W | 18 | 28.57 % | | 18 | 28.13 % | | 2 | C C D C C | CR3DX | 14 | 22.22 % | | 14 | 21.88 % | | 3 | C C D C C C | CT9ABY | 14 | 22.22 % | | 14 | 21.88 % | | 4 | C D C C | K0EJ | 7 | 11.11 % | | 7 | 10.94 % | | 5 | C D C C C | F4AIF | 4 | 6.35 % | | 4 | 6.25 % | | 6 | C D C | M3D | 2 | 3.17 % | | 3 | 4.69 % | | 7 | C D D C C | S51CK | 2 | 3.17 % | | 2 | 3.13 % | | 8 | C D D C C C | S57PKT | 1 | 1.59 % | | 1 | 1.56 % | | 9 | C C D D D C | TM123K | 1 | 1.59 % | | 1 | 1.56 % | |
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