| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0ARY | 237 | 36.24 % | | 249 | 34.58 % | | 2 | C C D C C C | KA0DOS | 147 | 22.48 % | | 153 | 21.25 % | | 3 | C D C C | I4WL | 133 | 20.34 % | | 150 | 20.83 % | | 4 | C C D C C | AA2XB | 68 | 10.40 % | | 70 | 9.72 % | | 5 | C C D C | AB0O | 43 | 6.57 % | | 46 | 6.39 % | | 6 | C D C | K0M | 23 | 3.52 % | | 24 | 3.33 % | | 7 | C D C C C C | K5WPOP | 1 | 0.15 % | | 1 | 0.14 % | | 8 | C D D C | W32A | 1 | 0.15 % | | 1 | 0.14 % | | 9 | C C D C C / D | WW2OK/5 | 1 | 0.15 % | | 1 | 0.14 % | |
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