| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 377 | 36.71 % | | 627 | 38.16 % | | 2 | C D C C C | F6AGM | 195 | 18.99 % | | 288 | 17.53 % | | 3 | C C D C | AA0O | 191 | 18.60 % | | 335 | 20.39 % | | 4 | C C D C C | AA0AI | 143 | 13.92 % | | 234 | 14.24 % | | 5 | C C D C C C | KA1IOR | 115 | 11.20 % | | 152 | 9.25 % | | 6 | C D D C C | V31XX | 2 | 0.19 % | | 3 | 0.18 % | | 7 | C C D C / D | KL2A/5 | 2 | 0.19 % | | 2 | 0.12 % | | 8 | C C C D C | KCR9K | 1 | 0.10 % | | 1 | 0.06 % | | 9 | C D C C / D | K2ZR/4 | 1 | 0.10 % | | 1 | 0.06 % | |
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