| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AV | 173 | 32.89 % | | 200 | 33.78 % | | 2 | C D C C C | K0DCA | 155 | 29.47 % | | 172 | 29.05 % | | 3 | C C D C C | AA1AR | 65 | 12.36 % | | 71 | 11.99 % | | 4 | C C D C C C | KA5CRL | 59 | 11.22 % | | 62 | 10.47 % | | 5 | C C D C | AA3B | 57 | 10.84 % | | 68 | 11.49 % | | 6 | C D C | K6D | 16 | 3.04 % | | 18 | 3.04 % | | 7 | C D C C / D | K6NR/7 | 1 | 0.19 % | | 1 | 0.17 % | |
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