| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | RA4Y | 36 | 28.35 % | | 44 | 28.57 % | | 2 | C C D C C | RA1AL | 31 | 24.41 % | | 37 | 24.03 % | | 3 | C D C C | R2FZ | 23 | 18.11 % | | 30 | 19.48 % | | 4 | C C D C C C | RA6YDX | 11 | 8.66 % | | 12 | 7.79 % | | 5 | C C D C / C | RA5G/P | 9 | 7.09 % | | 13 | 8.44 % | | 6 | C D C C / C | R2SM/P | 6 | 4.72 % | | 7 | 4.55 % | | 7 | C C D C C / C | RD3OP/P | 5 | 3.94 % | | 5 | 3.25 % | | 8 | C C D C C / D | RA1ZZ/3 | 2 | 1.57 % | | 2 | 1.30 % | | 9 | C D C C C / C | R2FBK/P | 1 | 0.79 % | | 1 | 0.65 % | | 10 | C C D C / D | RU4W/3 | 1 | 0.79 % | | 1 | 0.65 % | | 11 | C C D C C C / D | UA1ODM/3 | 1 | 0.79 % | | 1 | 0.65 % | | 12 | C C D C C C / C | UA3LEO/P | 1 | 0.79 % | | 1 | 0.65 % | |
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