| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 408 | 39.31 % | | 414 | 38.66 % | | 2 | C D C C C | F4AZF | 208 | 20.04 % | | 217 | 20.26 % | | 3 | C C D C | AA1K | 180 | 17.34 % | | 187 | 17.46 % | | 4 | C C D C C | AA0AW | 133 | 12.81 % | | 138 | 12.89 % | | 5 | C C D C C C | CT1AOZ | 100 | 9.63 % | | 106 | 9.90 % | | 6 | C D / C C D C C C | W5/MM0LID | 2 | 0.19 % | | 2 | 0.19 % | | 7 | C C D C / D | NA3M/4 | 2 | 0.19 % | | 2 | 0.19 % | | 8 | C C / C D C C | FS/K9EL | 1 | 0.10 % | | 1 | 0.09 % | | 9 | D C D C | 4M1K | 1 | 0.10 % | | 1 | 0.09 % | | 10 | C C D C C / D | KB1QU/4 | 1 | 0.10 % | | 1 | 0.09 % | | 11 | C D / C D C C C | W4/G3LIK | 1 | 0.10 % | | 1 | 0.09 % | | 12 | C C D C C C / C D | VE5SDH/W4 | 1 | 0.10 % | | 1 | 0.09 % | |
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