| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | AB2E | 433 | 25.58 % | | 652 | 28.63 % | | 2 | C C D C C | AB2ZY | 402 | 23.74 % | | 508 | 22.31 % | | 3 | C D C C | E7CW | 339 | 20.02 % | | 471 | 20.69 % | | 4 | C C D C C C | CT7AUP | 291 | 17.19 % | | 352 | 15.46 % | | 5 | C D C C C | F1IWH | 148 | 8.74 % | | 188 | 8.26 % | | 6 | C D D C | E77T | 18 | 1.06 % | | 27 | 1.19 % | | 7 | C D C | G2X | 15 | 0.89 % | | 23 | 1.01 % | | 8 | D C D C C | 4X1MM | 14 | 0.83 % | | 16 | 0.70 % | | 9 | C D D C C | S51EC | 13 | 0.77 % | | 15 | 0.66 % | | 10 | D C D C | 4O3A | 8 | 0.47 % | | 10 | 0.44 % | | 11 | C C D D C C | OL50DJ | 2 | 0.12 % | | 3 | 0.13 % | | 12 | C C D C / C D | KH7X/W7 | 1 | 0.06 % | | 2 | 0.09 % | | 13 | D C / C C D C C | 4L/LY4ZZ | 1 | 0.06 % | | 1 | 0.04 % | | 14 | C C D / C C D C C C | EA8/DL2DXA | 1 | 0.06 % | | 1 | 0.04 % | | 15 | C C D / C C D C | KP4/KA1R | 1 | 0.06 % | | 1 | 0.04 % | | 16 | C D D C C C | S57NAW | 1 | 0.06 % | | 1 | 0.04 % | | 17 | C D / C C D C C | W1/PY1MX | 1 | 0.06 % | | 1 | 0.04 % | | 18 | C D C C D | W1NT5 | 1 | 0.06 % | | 1 | 0.04 % | | 19 | C C D D D D C C C | YT1914CER | 1 | 0.06 % | | 1 | 0.04 % | | 20 | C C D C C / C C C | YU1LM/QRP | 1 | 0.06 % | | 2 | 0.09 % | | 21 | C D / C D C C | Z3/K0AP | 1 | 0.06 % | | 1 | 0.04 % | |
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