| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0IL | 170 | 31.42 % | | 316 | 32.48 % | | 2 | C C D C | AA3B | 111 | 20.52 % | | 208 | 21.38 % | | 3 | C D C C C | K0CRN | 99 | 18.30 % | | 176 | 18.09 % | | 4 | C C D C C C | KA2KON | 82 | 15.16 % | | 129 | 13.26 % | | 5 | C C D C C | AA0AW | 72 | 13.31 % | | 122 | 12.54 % | | 6 | D C D C C | 4U1UN | 1 | 0.18 % | | 1 | 0.10 % | | 7 | D C D C | 6Y1A | 1 | 0.18 % | | 1 | 0.10 % | | 8 | D C D C C C | 9A1CCY | 1 | 0.18 % | | 1 | 0.10 % | | 9 | C C D C C / D | KE9TP/6 | 1 | 0.18 % | | 1 | 0.10 % | | 10 | C C D C C C / C C D | KI6RRN/KL7 | 1 | 0.18 % | | 1 | 0.10 % | | 11 | C D C C C / C C D | N6QEK/KL7 | 1 | 0.18 % | | 1 | 0.10 % | | 12 | C C D C / D | NE8O/4 | 1 | 0.18 % | | 2 | 0.21 % | |
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