| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | AO3MMM | 590 | 52.44 % | | 798 | 53.13 % | | 2 | C C D C C | BA4TB | 289 | 25.69 % | | 387 | 25.77 % | | 3 | C D C C C | F1DFF | 146 | 12.98 % | | 186 | 12.38 % | | 4 | C C D C | EA4T | 26 | 2.31 % | | 36 | 2.40 % | | 5 | C D C C | D1DX | 24 | 2.13 % | | 31 | 2.06 % | | 6 | D C D C C | 4O4DB | 14 | 1.24 % | | 23 | 1.53 % | | 7 | C D D C C | C31IK | 10 | 0.89 % | | 11 | 0.73 % | | 8 | D C D C C C | 2E0KCD | 5 | 0.44 % | | 7 | 0.47 % | | 9 | C D D C | E77D | 4 | 0.36 % | | 6 | 0.40 % | | 10 | D C D C | 8S2A | 4 | 0.36 % | | 4 | 0.27 % | | 11 | C C D C C C / C C C | IK2UVU/QRP | 3 | 0.27 % | | 3 | 0.20 % | | 12 | C C D C C C C | II3TNXC | 2 | 0.18 % | | 2 | 0.13 % | | 13 | C C D D C C | HA50HK | 1 | 0.09 % | | 1 | 0.07 % | | 14 | C D D C C C | E73ECJ | 1 | 0.09 % | | 1 | 0.07 % | | 15 | C C / C C D C C | ER/UR7FM | 1 | 0.09 % | | 1 | 0.07 % | | 16 | C C D C C C / C C D | IK4QJF/IN3 | 1 | 0.09 % | | 1 | 0.07 % | | 17 | C C D C C C / C C C / IV3BSS/ISO/P | 1 | 0.09 % | | 1 | 0.07 % | | | 18 | C C D C C C / D | IZ3LBC/7 | 1 | 0.09 % | | 1 | 0.07 % | | 19 | C C D D C C C | TM40KUQ | 1 | 0.09 % | | 1 | 0.07 % | | 20 | C C D C C / C C C | YU7FH/QRP | 1 | 0.09 % | | 1 | 0.07 % | |
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