| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 425 | 45.60 % | | 851 | 50.00 % | | 2 | C D C C C | K0ARY | 185 | 19.85 % | | 304 | 17.86 % | | 3 | C C D C | AA1K | 155 | 16.63 % | | 293 | 17.22 % | | 4 | C C D C C | AA0AI | 96 | 10.30 % | | 153 | 8.99 % | | 5 | C C D C C C | AK5CMI | 66 | 7.08 % | | 92 | 5.41 % | | 6 | C D C C / D | W1AW/6 | 2 | 0.21 % | | 6 | 0.35 % | | 7 | C D C C / C C D | N2WQ/VE3 | 1 | 0.11 % | | 1 | 0.06 % | | 8 | C D / C C D C C C | W1/YO7ARY | 1 | 0.11 % | | 1 | 0.06 % | | 9 | C C D C C C / C D | VE3JDF/W4 | 1 | 0.11 % | | 1 | 0.06 % | |
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