| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | JS1NDM | 186 | 27.84 % | | 211 | 26.31 % | | 2 | C D C C C | F5IRP | 158 | 23.65 % | | 179 | 22.32 % | | 3 | C D C C | K0EU | 137 | 20.51 % | | 177 | 22.07 % | | 4 | C C D C C | AA2MU | 107 | 16.02 % | | 131 | 16.33 % | | 5 | C C D C | AA1N | 78 | 11.68 % | | 102 | 12.72 % | | 6 | C C D / C D C C | KP4/K7RB | 1 | 0.15 % | | 1 | 0.12 % | | 7 | C D C | N1W | 1 | 0.15 % | | 1 | 0.12 % | |
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