| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0EU | 165 | 39.38 % | | 176 | 39.02 % | | 2 | C D C C C | K0AJW | 109 | 26.01 % | | 115 | 25.50 % | | 3 | C C D C | AA3B | 58 | 13.84 % | | 62 | 13.75 % | | 4 | C C D C C | AA2BJ | 42 | 10.02 % | | 42 | 9.31 % | | 5 | C C D C C C | KA2FIR | 32 | 7.64 % | | 33 | 7.32 % | | 6 | C D C | K1B | 13 | 3.10 % | | 15 | 3.33 % | |
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