| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 759 | 38.35 % | | 1610 | 42.28 % | | 2 | C C D C | AA0O | 382 | 19.30 % | | 739 | 19.41 % | | 3 | C D C C C | K0AOZ | 367 | 18.54 % | | 606 | 15.91 % | | 4 | C C D C C | AA0AI | 257 | 12.99 % | | 452 | 11.87 % | | 5 | C C D C C C | KA1API | 204 | 10.31 % | | 308 | 8.09 % | | 6 | C D C | K5F | 2 | 0.10 % | | 3 | 0.08 % | | 7 | C D C C / D | K2ZR/4 | 2 | 0.10 % | | 3 | 0.08 % | | 8 | C C D C C C / D | WA3RHW/4 | 2 | 0.10 % | | 4 | 0.11 % | | 9 | C C D C / D | NE8O/4 | 1 | 0.05 % | | 1 | 0.03 % | | 10 | C C D C C / C D | KH6ND/W7 | 1 | 0.05 % | | 3 | 0.08 % | | 11 | C D C C C / D | W9FFA/4 | 1 | 0.05 % | | 1 | 0.03 % | | 12 | C D C C / C | W1KP/M | 1 | 0.05 % | | 1 | 0.03 % | |
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