| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0DDS | 272 | 35.19 % | | 292 | 35.39 % | | 2 | C D C C | K1LX | 174 | 22.51 % | | 183 | 22.18 % | | 3 | C C D C C C | KA1BED | 161 | 20.83 % | | 170 | 20.61 % | | 4 | C C D C C | AA1HF | 105 | 13.58 % | | 113 | 13.70 % | | 5 | C C D C | AB8U | 40 | 5.17 % | | 44 | 5.33 % | | 6 | C D C | K1R | 20 | 2.59 % | | 22 | 2.67 % | | 7 | C C D C C C / C D C C | KD2KZJ/K2VN | 1 | 0.13 % | | 1 | 0.12 % | |
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