| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 138 | 28.16 % | | 208 | 29.89 % | | 2 | C D C C C | C6AAN | 115 | 23.47 % | | 156 | 22.41 % | | 3 | C C D C | AA0O | 97 | 19.80 % | | 146 | 20.98 % | | 4 | C C D C C C | EA8DED | 73 | 14.90 % | | 99 | 14.22 % | | 5 | C C D C C | AA0AW | 61 | 12.45 % | | 81 | 11.64 % | | 6 | C C D C / D | KI9S/8 | 2 | 0.41 % | | 2 | 0.29 % | | 7 | D C D C C | 4U1WB | 1 | 0.20 % | | 1 | 0.14 % | | 8 | C C D C C / D | KE8NN/6 | 1 | 0.20 % | | 1 | 0.14 % | | 9 | C D C | W1N | 1 | 0.20 % | | 1 | 0.14 % | | 10 | C C D C C C / D | WA9AFM/5 | 1 | 0.20 % | | 1 | 0.14 % | |
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