| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | AI4WW | 31 | 28.44 % | | 37 | 28.68 % | | 2 | C C D C | DP5X | 30 | 27.52 % | | 35 | 27.13 % | | 3 | C C D C C C | CT1DRB | 27 | 24.77 % | | 32 | 24.81 % | | 4 | C D C C | K1ZZ | 5 | 4.59 % | | 8 | 6.20 % | | 5 | C D D C | P33W | 5 | 4.59 % | | 5 | 3.88 % | | 6 | C D C C C | F5OZC | 5 | 4.59 % | | 6 | 4.65 % | | 7 | C D D C C | E77DX | 3 | 2.75 % | | 3 | 2.33 % | | 8 | D C D C | 4L8A | 2 | 1.83 % | | 2 | 1.55 % | | 9 | C C D C C C / C | DL7USW/P | 1 | 0.92 % | | 1 | 0.78 % | |
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