| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0EA | 176 | 37.93 % | | 218 | 40.07 % | | 2 | C D C C C | K0ANT | 134 | 28.88 % | | 155 | 28.49 % | | 3 | C C D C C | AA0NI | 51 | 10.99 % | | 57 | 10.48 % | | 4 | C C D C | AA3B | 48 | 10.34 % | | 55 | 10.11 % | | 5 | C C D C C C | CF3RAC | 33 | 7.11 % | | 33 | 6.07 % | | 6 | C D C | K0Z | 20 | 4.31 % | | 24 | 4.41 % | | 7 | C D C C / C C D | K2NV/VE3 | 1 | 0.22 % | | 1 | 0.18 % | | 8 | C C D C / D | WU6X/4 | 1 | 0.22 % | | 1 | 0.18 % | |
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