| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0EJC | 41 | 39.05 % | | 43 | 39.81 % | | 2 | C D C C | K4HH | 26 | 24.76 % | | 26 | 24.07 % | | 3 | C C D C C | AB5ER | 15 | 14.29 % | | 16 | 14.81 % | | 4 | C C D C C C | KB1VCR | 14 | 13.33 % | | 14 | 12.96 % | | 5 | C C D C | AB8U | 8 | 7.62 % | | 8 | 7.41 % | | 6 | C D C | W5M | 1 | 0.95 % | | 1 | 0.93 % | |
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