| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 436 | 43.43 % | | 440 | 43.52 % | | 2 | C C D C | AA3B | 180 | 17.93 % | | 182 | 18.00 % | | 3 | C D C C C | K0DEQ | 171 | 17.03 % | | 171 | 16.91 % | | 4 | C C D C C | AA0AW | 135 | 13.45 % | | 135 | 13.35 % | | 5 | C C D C C C | KA0NES | 76 | 7.57 % | | 77 | 7.62 % | | 6 | C C D / C D C C | KP4/K7GM | 2 | 0.20 % | | 2 | 0.20 % | | 7 | C C D C / D | AI0Y/9 | 1 | 0.10 % | | 1 | 0.10 % | | 8 | C D C C / D | K9MA/7 | 1 | 0.10 % | | 1 | 0.10 % | | 9 | C C D C C C / D | KB1EFS/2 | 1 | 0.10 % | | 1 | 0.10 % | | 10 | C C D C / C C | AJ1G/Ri | 1 | 0.10 % | | 1 | 0.10 % | |
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