| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 175 | 27.13 % | | 316 | 28.96 % | | 2 | C D C C C | F4DSK | 133 | 20.62 % | | 214 | 19.62 % | | 3 | C C D C | AA0O | 130 | 20.16 % | | 222 | 20.35 % | | 4 | C C D C C | AA0AW | 103 | 15.97 % | | 171 | 15.67 % | | 5 | C C D C C C | KA1ULN | 99 | 15.35 % | | 159 | 14.57 % | | 6 | C D C C C / D | K6DTT/1 | 1 | 0.16 % | | 3 | 0.27 % | | 7 | C C D C / D | AI6O/0 | 1 | 0.16 % | | 1 | 0.09 % | | 8 | C C D C C C / D | KA4PKB/0 | 1 | 0.16 % | | 1 | 0.09 % | | 9 | C C D / C D C C C | VE3/K0MKL | 1 | 0.16 % | | 3 | 0.27 % | | 10 | C D C | W1N | 1 | 0.16 % | | 1 | 0.09 % | |
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