| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | CN2R | 55 | 37.16 % | | 61 | 37.89 % | | 2 | C C D C C | CR3OO | 33 | 22.30 % | | 36 | 22.36 % | | 3 | C C D C C C | DA0WRT | 23 | 15.54 % | | 23 | 14.29 % | | 4 | C D D C | E70T | 6 | 4.05 % | | 6 | 3.73 % | | 5 | C D C | G3V | 5 | 3.38 % | | 7 | 4.35 % | | 6 | D C D C | 9A1A | 5 | 3.38 % | | 6 | 3.73 % | | 7 | C D C C | F5IN | 5 | 3.38 % | | 5 | 3.11 % | | 8 | C D D C C | E79EA | 4 | 2.70 % | | 4 | 2.48 % | | 9 | D C D C C | 5P3WW | 4 | 2.70 % | | 5 | 3.11 % | | 10 | C D C C C | F5OHM | 3 | 2.03 % | | 3 | 1.86 % | | 11 | C C D / C C D C C C | EA9/EA5HPX | 1 | 0.68 % | | 1 | 0.62 % | | 12 | D C D C C C | 9A1CBM | 1 | 0.68 % | | 1 | 0.62 % | | 13 | C C D / C C D C C | CT9/OM3BH | 1 | 0.68 % | | 1 | 0.62 % | | 14 | C C D D D C C C | LZ105PBP | 1 | 0.68 % | | 1 | 0.62 % | | 15 | C C / C C D C C | OE/DJ6OI | 1 | 0.68 % | | 1 | 0.62 % | |
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