| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0ANS | 651 | 33.33 % | | 805 | 33.03 % | | 2 | C C D C C C | AA9LMS | 417 | 21.35 % | | 471 | 19.33 % | | 3 | C D C C | K0AV | 407 | 20.84 % | | 572 | 23.47 % | | 4 | C C D C C | AA0YA | 246 | 12.60 % | | 297 | 12.19 % | | 5 | C C D C | AA3B | 176 | 9.01 % | | 215 | 8.82 % | | 6 | C D C | K0R | 48 | 2.46 % | | 69 | 2.83 % | | 7 | C C D C C C / D | KB6QPI/4 | 2 | 0.10 % | | 2 | 0.08 % | | 8 | D C D C C | 4C2BC | 1 | 0.05 % | | 1 | 0.04 % | | 9 | C D C C C / C | K0DSC/M | 1 | 0.05 % | | 1 | 0.04 % | | 10 | C D C C C / D | K7IDX/7 | 1 | 0.05 % | | 1 | 0.04 % | | 11 | C D C C C C | K7JSCG | 1 | 0.05 % | | 1 | 0.04 % | | 12 | C D C C C D C | N2PYH1E | 1 | 0.05 % | | 1 | 0.04 % | | 13 | C D D C C | V31YB | 1 | 0.05 % | | 1 | 0.04 % | |
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