| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | AA0AI | 193 | 28.85 % | | 251 | 27.61 % | | 2 | C C D C | AA3B | 185 | 27.65 % | | 270 | 29.70 % | | 3 | C C D C C C | BG1WNU | 149 | 22.27 % | | 198 | 21.78 % | | 4 | C D C C | E7DX | 92 | 13.75 % | | 129 | 14.19 % | | 5 | C D C C C | G3TXF | 11 | 1.64 % | | 12 | 1.32 % | | 6 | D C D C | 4O3A | 6 | 0.90 % | | 8 | 0.88 % | | 7 | C D D C C | A65BP | 5 | 0.75 % | | 5 | 0.55 % | | 8 | C D D C | P33W | 5 | 0.75 % | | 6 | 0.66 % | | 9 | C C D C C C / D | JH1MTR/4 | 4 | 0.60 % | | 6 | 0.66 % | | 10 | D C D C C C | 4U1ITU | 4 | 0.60 % | | 5 | 0.55 % | | 11 | D C D C C | 9A2EU | 3 | 0.45 % | | 5 | 0.55 % | | 12 | C D C | G5O | 3 | 0.45 % | | 5 | 0.55 % | | 13 | C C D C C / D | BG9XD/5 | 1 | 0.15 % | | 1 | 0.11 % | | 14 | C D D C C C | E21EIC | 1 | 0.15 % | | 1 | 0.11 % | | 15 | C C D D C | OG73X | 1 | 0.15 % | | 1 | 0.11 % | | 16 | C C D C C C C | DK0WRTC | 1 | 0.15 % | | 1 | 0.11 % | | 17 | C C D C C C / C | RU0LAX/P | 1 | 0.15 % | | 1 | 0.11 % | | 18 | C C D C C / C C C | RU3TJ/QRP | 1 | 0.15 % | | 1 | 0.11 % | | 19 | C C D C / D | RX4W/3 | 1 | 0.15 % | | 1 | 0.11 % | | 20 | C D D D C C C | S570ABC | 1 | 0.15 % | | 1 | 0.11 % | | 21 | C C D D C C C | YO80YRH | 1 | 0.15 % | | 1 | 0.11 % | |
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