| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0ACP | 468 | 26.70 % | | 473 | 26.54 % | | 2 | C D C C | K0AD | 420 | 23.96 % | | 422 | 23.68 % | | 3 | C C D C C C | KA0BOJ | 347 | 19.79 % | | 353 | 19.81 % | | 4 | C C D C C | AA0KW | 273 | 15.57 % | | 285 | 15.99 % | | 5 | C C D C | AA0O | 238 | 13.58 % | | 242 | 13.58 % | | 6 | C D C C / D | K7RB/1 | 2 | 0.11 % | | 2 | 0.11 % | | 7 | C D C C C / D | K6WDE/7 | 1 | 0.06 % | | 1 | 0.06 % | | 8 | C D C | K7T | 1 | 0.06 % | | 1 | 0.06 % | | 9 | C C D C C / D | AB5ZA/7 | 1 | 0.06 % | | 1 | 0.06 % | | 10 | C C D C C C / C C | KE0SKO/AG | 1 | 0.06 % | | 1 | 0.06 % | | 11 | C C D C / D | NE8O/4 | 1 | 0.06 % | | 1 | 0.06 % | |
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