| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 431 | 45.80 % | | 776 | 49.40 % | | 2 | C C D C | AB1C | 186 | 19.77 % | | 309 | 19.67 % | | 3 | C D C C C | K0TRL | 146 | 15.52 % | | 226 | 14.39 % | | 4 | C C D C C | AB3CX | 101 | 10.73 % | | 157 | 9.99 % | | 5 | C C D C C C | KA1YQC | 74 | 7.86 % | | 100 | 6.37 % | | 6 | C C D C C / C D | KH6ND/W7 | 1 | 0.11 % | | 1 | 0.06 % | | 7 | C C D C / D | NE8O/4 | 1 | 0.11 % | | 1 | 0.06 % | | 8 | C C D C C C / D | WA3RHW/4 | 1 | 0.11 % | | 1 | 0.06 % | |
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