| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K3ZO | 17 | 25.37 % | | 17 | 25.37 % | | 2 | C D C C C | K0MLD | 16 | 23.88 % | | 16 | 23.88 % | | 3 | C C D C C | AA4CS | 15 | 22.39 % | | 15 | 22.39 % | | 4 | C C D C C C | KC7SNO | 9 | 13.43 % | | 9 | 13.43 % | | 5 | C C D C | AB3I | 7 | 10.45 % | | 7 | 10.45 % | | 6 | C D C | K1B | 2 | 2.99 % | | 2 | 2.99 % | | 7 | C C D D C C | VE30RF | 1 | 1.49 % | | 1 | 1.49 % | |
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