| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | CT1DRB | 155 | 31.63 % | | 205 | 30.64 % | | 2 | C C D C C | AB3CX | 134 | 27.35 % | | 168 | 25.11 % | | 3 | C C D C | CR6K | 101 | 20.61 % | | 162 | 24.22 % | | 4 | C D C C C | F1VEV | 32 | 6.53 % | | 47 | 7.03 % | | 5 | C D C C | F5IN | 21 | 4.29 % | | 25 | 3.74 % | | 6 | C D D C | A42K | 15 | 3.06 % | | 17 | 2.54 % | | 7 | D C D C C | 4X6FR | 9 | 1.84 % | | 11 | 1.64 % | | 8 | D C D C | 4O4A | 5 | 1.02 % | | 7 | 1.05 % | | 9 | C D D C C | A71EM | 5 | 1.02 % | | 8 | 1.20 % | | 10 | C C D D C C | EO50FF | 3 | 0.61 % | | 4 | 0.60 % | | 11 | C D C | M8A | 3 | 0.61 % | | 5 | 0.75 % | | 12 | C C D D C C C | OL75KCR | 2 | 0.41 % | | 2 | 0.30 % | | 13 | D C / C C D C C | 9A/OS6GU | 1 | 0.20 % | | 1 | 0.15 % | | 14 | C D C C C / D | I2WIJ/1 | 1 | 0.20 % | | 3 | 0.45 % | | 15 | C C D C C / D | TA2DA/3 | 1 | 0.20 % | | 2 | 0.30 % | | 16 | C C D C C / C C C | YU1LM/QRP | 1 | 0.20 % | | 1 | 0.15 % | | 17 | C D D C / C | Z35M/P | 1 | 0.20 % | | 1 | 0.15 % | |
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