| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 421 | 36.67 % | | 850 | 40.21 % | | 2 | C D C C C | F8AUF | 222 | 19.34 % | | 378 | 17.88 % | | 3 | C C D C | AA3B | 210 | 18.29 % | | 400 | 18.92 % | | 4 | C C D C C | AA0AI | 163 | 14.20 % | | 288 | 13.62 % | | 5 | C C D C C C | CE2MVF | 122 | 10.63 % | | 187 | 8.85 % | | 6 | C C D C / D | AA7G/2 | 3 | 0.26 % | | 3 | 0.14 % | | 7 | C D C C / D | K2ZR/4 | 2 | 0.17 % | | 2 | 0.09 % | | 8 | C D C C C / D | K8RGI/4 | 2 | 0.17 % | | 2 | 0.09 % | | 9 | D C D C | 6Y6J | 1 | 0.09 % | | 1 | 0.05 % | | 10 | D C D C C | 4U1WB | 1 | 0.09 % | | 1 | 0.05 % | | 11 | C C D C C C / D | WA4USA/4 | 1 | 0.09 % | | 2 | 0.09 % | |
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