| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 835 | 39.93 % | | 1955 | 44.61 % | | 2 | C D C C C | F6EPO | 397 | 18.99 % | | 735 | 16.77 % | | 3 | C C D C | AA1K | 391 | 18.70 % | | 860 | 19.63 % | | 4 | C C D C C | AA0AI | 261 | 12.48 % | | 465 | 10.61 % | | 5 | C C D C C C | HB9KOG | 199 | 9.52 % | | 353 | 8.06 % | | 6 | D C D C C | 4U1WB | 2 | 0.10 % | | 3 | 0.07 % | | 7 | C D C C / D | K0XB/6 | 2 | 0.10 % | | 2 | 0.05 % | | 8 | C D C C C / D | K8RGI/4 | 1 | 0.05 % | | 3 | 0.07 % | | 9 | C C D C / C D | KH7X/W7 | 1 | 0.05 % | | 1 | 0.02 % | | 10 | C C D C / D | NE8O/4 | 1 | 0.05 % | | 2 | 0.05 % | | 11 | C D / C C D C C | W4/LZ5KF | 1 | 0.05 % | | 3 | 0.07 % | |
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