| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | AA1K | 108 | 36.86 % | | 120 | 37.15 % | | 2 | C C D C C | AB3CX | 62 | 21.16 % | | 66 | 20.43 % | | 3 | C D C C | E7CW | 41 | 13.99 % | | 44 | 13.62 % | | 4 | C C D C C C | DL6KWN | 21 | 7.17 % | | 23 | 7.12 % | | 5 | C D C C C | F5MUX | 18 | 6.14 % | | 18 | 5.57 % | | 6 | C D D C | A44A | 11 | 3.75 % | | 13 | 4.02 % | | 7 | D C D C | 3Z1K | 8 | 2.73 % | | 11 | 3.41 % | | 8 | C D D C C | E78WW | 8 | 2.73 % | | 8 | 2.48 % | | 9 | C D C | G3V | 6 | 2.05 % | | 9 | 2.79 % | | 10 | D C D C C | 8S0DX | 2 | 0.68 % | | 2 | 0.62 % | | 11 | D C D D D C | 3Z100I | 1 | 0.34 % | | 1 | 0.31 % | | 12 | D C D D C | 4U73B | 1 | 0.34 % | | 1 | 0.31 % | | 13 | D C D C C C | 9A1EZA | 1 | 0.34 % | | 1 | 0.31 % | | 14 | C C D / C C D C C C | EA8/GU4YOX | 1 | 0.34 % | | 1 | 0.31 % | | 15 | C C D / C C D C | IH9/OL3R | 1 | 0.34 % | | 1 | 0.31 % | | 16 | C C D D C | OG60F | 1 | 0.34 % | | 2 | 0.62 % | | 17 | C C D D D C | YR100R | 1 | 0.34 % | | 1 | 0.31 % | | 18 | C C D D D D C C | YR1918BB | 1 | 0.34 % | | 1 | 0.31 % | |
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