| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | CO2RVA | 215 | 31.39 % | | 218 | 31.41 % | | 2 | C C D C C | AA0AW | 193 | 28.18 % | | 197 | 28.39 % | | 3 | C C D C | AA3B | 108 | 15.77 % | | 108 | 15.56 % | | 4 | C D C C | K0FX | 75 | 10.95 % | | 76 | 10.95 % | | 5 | C D C C C | F1EBN | 74 | 10.80 % | | 75 | 10.81 % | | 6 | C C D C C C / D | JA2DGQ/3 | 2 | 0.29 % | | 2 | 0.29 % | | 7 | D C D C C | 4Z4DX | 2 | 0.29 % | | 2 | 0.29 % | | 8 | D C D C | 9A1A | 2 | 0.29 % | | 2 | 0.29 % | | 9 | C D D C C C | E20YLM | 2 | 0.29 % | | 2 | 0.29 % | | 10 | D C D C C C | 7K1PTT | 2 | 0.29 % | | 2 | 0.29 % | | 11 | C D D C | E72U | 2 | 0.29 % | | 2 | 0.29 % | | 12 | C C D / C C D C C | EW8/RW3DO | 1 | 0.15 % | | 1 | 0.14 % | | 13 | C D D C C | A65BP | 1 | 0.15 % | | 1 | 0.14 % | | 14 | C C D D C | CW90A | 1 | 0.15 % | | 1 | 0.14 % | | 15 | C C D D C C | OG30OJ | 1 | 0.15 % | | 1 | 0.14 % | | 16 | C D D D C C | R250GS | 1 | 0.15 % | | 1 | 0.14 % | | 17 | C C D / C C D C C C | SV8/SV9FBP | 1 | 0.15 % | | 1 | 0.14 % | | 18 | C D C C C / D | W3DQN/5 | 1 | 0.15 % | | 1 | 0.14 % | | 19 | C D / C C D C C C | Z6/SP5CJQ | 1 | 0.15 % | | 1 | 0.14 % | |
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