| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 544 | 40.60 % | | 991 | 42.55 % | | 2 | C C D C | AB0S | 245 | 18.28 % | | 469 | 20.14 % | | 3 | C D C C C | K0ACP | 229 | 17.09 % | | 336 | 14.43 % | | 4 | C C D C C | AB0RX | 175 | 13.06 % | | 293 | 12.58 % | | 5 | C C D C C C | KA1API | 140 | 10.45 % | | 194 | 8.33 % | | 6 | C C D C C C / D | KB1EFS/2 | 2 | 0.15 % | | 2 | 0.09 % | | 7 | C D C C / D | K2ZR/4 | 1 | 0.07 % | | 3 | 0.13 % | | 8 | C C D C / C D | KH7X/W7 | 1 | 0.07 % | | 2 | 0.09 % | | 9 | C C D C / D | NE8O/4 | 1 | 0.07 % | | 1 | 0.04 % | | 10 | C D / C C D C C | W2/DL8CX | 1 | 0.07 % | | 1 | 0.04 % | | 11 | C C D C C C / C C C | WB9CTP/QRP | 1 | 0.07 % | | 1 | 0.04 % | |
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