| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0DDS | 409 | 36.13 % | | 468 | 36.00 % | | 2 | C D C C | K1IG | 271 | 23.94 % | | 325 | 25.00 % | | 3 | C C D C C C | KA0SIX | 205 | 18.11 % | | 219 | 16.85 % | | 4 | C C D C C | AA1HF | 136 | 12.01 % | | 160 | 12.31 % | | 5 | C C D C | AA3B | 72 | 6.36 % | | 85 | 6.54 % | | 6 | C D C | K0J | 38 | 3.36 % | | 42 | 3.23 % | | 7 | C C D C C C / C D C C | KD2KZJ/K2VN | 1 | 0.09 % | | 1 | 0.08 % | |
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