| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | AD7HI | 210 | 40.31 % | | 291 | 41.57 % | | 2 | C C D C | AA3B | 108 | 20.73 % | | 156 | 22.29 % | | 3 | C C D C C C | CT1DRB | 103 | 19.77 % | | 123 | 17.57 % | | 4 | C D C C C | F5ICC | 34 | 6.53 % | | 41 | 5.86 % | | 5 | C D C C | F5IN | 32 | 6.14 % | | 44 | 6.29 % | | 6 | C D D C | E74X | 7 | 1.34 % | | 10 | 1.43 % | | 7 | D C D C C | 9A1AA | 5 | 0.96 % | | 6 | 0.86 % | | 8 | D C D C | 4U1A | 4 | 0.77 % | | 5 | 0.71 % | | 9 | C D D C C | D41CV | 4 | 0.77 % | | 6 | 0.86 % | | 10 | C C D D D C | HF100N | 3 | 0.58 % | | 3 | 0.43 % | | 11 | C D C | M3I | 2 | 0.38 % | | 3 | 0.43 % | | 12 | D C D D D C | 3Z100I | 1 | 0.19 % | | 1 | 0.14 % | | 13 | C C D / C C D C | EA8/UA5C | 1 | 0.19 % | | 3 | 0.43 % | | 14 | D C D C C C | 9A1CRT | 1 | 0.19 % | | 1 | 0.14 % | | 15 | D C D / C C D C C | 5Z4/LZ4NM | 1 | 0.19 % | | 1 | 0.14 % | | 16 | C C D D C C | HG90BJ | 1 | 0.19 % | | 1 | 0.14 % | | 17 | C C D / C D C C C | CT7/F6HBR | 1 | 0.19 % | | 2 | 0.29 % | | 18 | C C / C C D C C | OK/LZ3SF | 1 | 0.19 % | | 1 | 0.14 % | | 19 | C C D C C / D | SV1YR/3 | 1 | 0.19 % | | 1 | 0.14 % | | 20 | C C D C C C / C | WA0USA/M | 1 | 0.19 % | | 1 | 0.14 % | |
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