| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AIZ | 370 | 35.99 % | | 449 | 36.42 % | | 2 | C D C C | F5IN | 214 | 20.82 % | | 273 | 22.14 % | | 3 | C C D C C C | KA2UFP | 206 | 20.04 % | | 230 | 18.65 % | | 4 | C C D C C | AA0RC | 123 | 11.96 % | | 148 | 12.00 % | | 5 | C C D C | AB4Z | 89 | 8.66 % | | 101 | 8.19 % | | 6 | C D C | K0B | 23 | 2.24 % | | 29 | 2.35 % | | 7 | C D C C C D C | N4EAR3A | 1 | 0.10 % | | 1 | 0.08 % | | 8 | C D C D | W3A0 | 1 | 0.10 % | | 1 | 0.08 % | | 9 | C D / C C D C C C | W5/DU1ANA | 1 | 0.10 % | | 1 | 0.08 % | |
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