| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 512 | 41.97 % | | 519 | 41.85 % | | 2 | C D C C C | K0ACP | 245 | 20.08 % | | 252 | 20.32 % | | 3 | C C D C | AA1K | 202 | 16.56 % | | 204 | 16.45 % | | 4 | C C D C C | AA0FO | 130 | 10.66 % | | 134 | 10.81 % | | 5 | C C D C C C | KA1IOR | 126 | 10.33 % | | 126 | 10.16 % | | 6 | C D C C / D | K2LE/1 | 2 | 0.16 % | | 2 | 0.16 % | | 7 | C C D C / D | NE8O/4 | 2 | 0.16 % | | 2 | 0.16 % | | 8 | C C D C / C C | AJ1G/Ct | 1 | 0.08 % | | 1 | 0.08 % | |
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