| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 352 | 38.47 % | | 611 | 40.30 % | | 2 | C D C C C | K0DME | 172 | 18.80 % | | 250 | 16.49 % | | 3 | C C D C | AA2D | 158 | 17.27 % | | 278 | 18.34 % | | 4 | C C D C C | AA0AW | 132 | 14.43 % | | 228 | 15.04 % | | 5 | C C D C C C | CX1CAN | 93 | 10.16 % | | 129 | 8.51 % | | 6 | C D C | K3Z | 4 | 0.44 % | | 10 | 0.66 % | | 7 | C D C C / D | K2ZR/4 | 2 | 0.22 % | | 3 | 0.20 % | | 8 | D C D C | 8P5A | 1 | 0.11 % | | 5 | 0.33 % | | 9 | D C D C C | 4U1WB | 1 | 0.11 % | | 2 | 0.13 % | |
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