| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 136 | 37.67 % | | 137 | 37.85 % | | 2 | C C D C | AD8J | 67 | 18.56 % | | 67 | 18.51 % | | 3 | C C D C C | AA1JD | 64 | 17.73 % | | 64 | 17.68 % | | 4 | C D C C C | K0ITC | 56 | 15.51 % | | 56 | 15.47 % | | 5 | C C D C C C | DL2ARD | 33 | 9.14 % | | 33 | 9.12 % | | 6 | C D D C | J35X | 1 | 0.28 % | | 1 | 0.28 % | | 7 | D C D C | 9Z4Y | 1 | 0.28 % | | 1 | 0.28 % | | 8 | C C D C / D | AI0Y/9 | 1 | 0.28 % | | 1 | 0.28 % | | 9 | C D D C C | V51YJ | 1 | 0.28 % | | 1 | 0.28 % | | 10 | C C D C C C / D | WB8BZG/4 | 1 | 0.28 % | | 1 | 0.28 % | |
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