| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 385 | 26.23 % | | 388 | 26.18 % | | 2 | C D C C C | K0AJW | 382 | 26.02 % | | 385 | 25.98 % | | 3 | C C D C C C | KA0KIG | 294 | 20.03 % | | 296 | 19.97 % | | 4 | C C D C C | AA1JM | 205 | 13.96 % | | 207 | 13.97 % | | 5 | C C D C | AA0B | 190 | 12.94 % | | 194 | 13.09 % | | 6 | C D C C C / D | K0WXT/3 | 2 | 0.14 % | | 2 | 0.13 % | | 7 | D C D C C | 4U1WB | 1 | 0.07 % | | 1 | 0.07 % | | 8 | C D D C C C | K16NAZ | 1 | 0.07 % | | 1 | 0.07 % | | 9 | C D C D D C C | K6J32AT | 1 | 0.07 % | | 1 | 0.07 % | | 10 | C D C C C / C C | K7TBB/AE | 1 | 0.07 % | | 1 | 0.07 % | | 11 | C C D C C / C | AA4SI/M | 1 | 0.07 % | | 1 | 0.07 % | | 12 | C C D C C C / D | KM4JWW/7 | 1 | 0.07 % | | 1 | 0.07 % | | 13 | C D C C / D | N3EN/8 | 1 | 0.07 % | | 1 | 0.07 % | | 14 | C D C C / C | N3JO/M | 1 | 0.07 % | | 1 | 0.07 % | | 15 | C C D C / D | NE8O/4 | 1 | 0.07 % | | 1 | 0.07 % | | 16 | C C D C / C D | NH6Z/W7 | 1 | 0.07 % | | 1 | 0.07 % | |
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