| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0HK | 122 | 40.26 % | | 122 | 39.74 % | | 2 | C D C C C | K0DIT | 76 | 25.08 % | | 76 | 24.76 % | | 3 | C C D C | AA3B | 43 | 14.19 % | | 43 | 14.01 % | | 4 | C C D C C | AA4RV | 31 | 10.23 % | | 31 | 10.10 % | | 5 | C C D C C C | KA2FIR | 22 | 7.26 % | | 22 | 7.17 % | | 6 | C D C | K1B | 9 | 2.97 % | | 9 | 2.93 % | |
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