| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0RC | 121 | 27.75 % | | 200 | 27.47 % | | 2 | C D C C C | K0ACP | 111 | 25.46 % | | 190 | 26.10 % | | 3 | C C D C | AA3S | 76 | 17.43 % | | 140 | 19.23 % | | 4 | C C D C C | AA1ON | 72 | 16.51 % | | 117 | 16.07 % | | 5 | C C D C C C | KA4BVG | 54 | 12.39 % | | 78 | 10.71 % | | 6 | C C D / C D C C C | KP4/K6DTT | 1 | 0.23 % | | 2 | 0.27 % | | 7 | C C D C / D | WU6X/4 | 1 | 0.23 % | | 1 | 0.14 % | |
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