| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K3CUJ | 126 | 35.90 % | | 126 | 32.90 % | | 2 | C C D C C C | KA3KAG | 87 | 24.79 % | | 87 | 22.72 % | | 3 | C D C C | K0WD | 70 | 19.94 % | | 70 | 18.28 % | | 4 | C C D C C | AA0PK | 40 | 11.40 % | | 40 | 10.44 % | | 5 | C D C | K4A | 15 | 4.27 % | | 15 | 3.92 % | | 6 | C C D C | AF5U | 10 | 2.85 % | | 10 | 2.61 % | | 7 | C D C C C / C C | K8ALB/AX | 1 | 0.28 % | | 1 | 0.26 % | | 8 | C D D C C | N50GW | 1 | 0.28 % | | 1 | 0.26 % | | 9 | C C D C C D | WB9FD2 | 1 | 0.28 % | | 1 | 0.26 % | |
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