| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0EU | 83 | 57.24 % | | 185 | 59.87 % | | 2 | C C D C | AA3B | 34 | 23.45 % | | 71 | 22.98 % | | 3 | C D C C C | K0VBU | 15 | 10.34 % | | 29 | 9.39 % | | 4 | C C D C C | AA5JF | 10 | 6.90 % | | 17 | 5.50 % | | 5 | C C D C C C | VA6RCN | 2 | 1.38 % | | 4 | 1.29 % | | 6 | C C D C C C / C C D | KI6RRN/KL7 | 1 | 0.69 % | | 1 | 0.32 % | |
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