| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 311 | 49.76 % | | 436 | 51.97 % | | 2 | C D C C C | K0ARY | 106 | 16.96 % | | 134 | 15.97 % | | 3 | C C D C | AA3B | 101 | 16.16 % | | 138 | 16.45 % | | 4 | C C D C C | AA0FO | 66 | 10.56 % | | 80 | 9.54 % | | 5 | C C D C C C | KA6BIM | 40 | 6.40 % | | 50 | 5.96 % | | 6 | C C D C C / C D | NP4IW/W6 | 1 | 0.16 % | | 1 | 0.12 % | |
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