| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0DQ | 379 | 47.55 % | | 793 | 50.51 % | | 2 | C D C C C | K0EOU | 144 | 18.07 % | | 261 | 16.62 % | | 3 | C C D C | AA1K | 138 | 17.31 % | | 295 | 18.79 % | | 4 | C C D C C | AA0AI | 80 | 10.04 % | | 140 | 8.92 % | | 5 | C C D C C C | KA1DBE | 55 | 6.90 % | | 80 | 5.10 % | | 6 | C C D C / C D | NH6T/W4 | 1 | 0.13 % | | 1 | 0.06 % | |
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