| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K4BT | 35 | 35.35 % | | 35 | 34.31 % | | 2 | C D C C C | K0IIT | 33 | 33.33 % | | 34 | 33.33 % | | 3 | C C D C C | AA4NC | 14 | 14.14 % | | 15 | 14.71 % | | 4 | C C D C | AA3B | 10 | 10.10 % | | 11 | 10.78 % | | 5 | C C D C C C | KD0VHD | 3 | 3.03 % | | 3 | 2.94 % | | 6 | C D C | N4O | 3 | 3.03 % | | 3 | 2.94 % | | 7 | C D D C C | W70TV | 1 | 1.01 % | | 1 | 0.98 % | |
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