| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | AC2K | 199 | 28.51 % | | 247 | 30.57 % | | 2 | C C D C C | AA7UN | 182 | 26.07 % | | 200 | 24.75 % | | 3 | C D C C | D1DX | 129 | 18.48 % | | 158 | 19.55 % | | 4 | C C D C C C | BD5FFK | 127 | 18.19 % | | 137 | 16.96 % | | 5 | C D C C C | F6ENO | 23 | 3.30 % | | 27 | 3.34 % | | 6 | C D D C C | A61EK | 10 | 1.43 % | | 10 | 1.24 % | | 7 | C D D C | A44A | 8 | 1.15 % | | 8 | 0.99 % | | 8 | D C D C | 6Y0W | 7 | 1.00 % | | 8 | 0.99 % | | 9 | C D C | B7Q | 6 | 0.86 % | | 6 | 0.74 % | | 10 | D C D C C | 4K8YL | 3 | 0.43 % | | 3 | 0.37 % | | 11 | C C D C C C C | DA0WRTC | 1 | 0.14 % | | 1 | 0.12 % | | 12 | C D C C / D | K9JF/7 | 1 | 0.14 % | | 1 | 0.12 % | | 13 | C C / C C D C C C | LX/PA3EZC | 1 | 0.14 % | | 1 | 0.12 % | | 14 | C D D C C C | S59ABC | 1 | 0.14 % | | 1 | 0.12 % | |
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