| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0EJ | 82 | 36.28 % | | 89 | 35.18 % | | 2 | C C D C | AD5A | 53 | 23.45 % | | 58 | 22.92 % | | 3 | C C D C C | AB9YC | 50 | 22.12 % | | 60 | 23.72 % | | 4 | C D C C C | I0ZUT | 11 | 4.87 % | | 11 | 4.35 % | | 5 | C C D C C C | IK0YUT | 9 | 3.98 % | | 10 | 3.95 % | | 6 | C D D C C | S50HQ | 4 | 1.77 % | | 4 | 1.58 % | | 7 | C D C | G3P | 3 | 1.33 % | | 4 | 1.58 % | | 8 | D C D C C | 7Z1SJ | 2 | 0.88 % | | 2 | 0.79 % | | 9 | C D D C | P33W | 2 | 0.88 % | | 3 | 1.19 % | | 10 | C D C C / D | W1AW/2 | 2 | 0.88 % | | 3 | 1.19 % | | 11 | C C D C C / D | NU1AW/5 | 2 | 0.88 % | | 2 | 0.79 % | | 12 | C C D C C / C | LU4AA/F | 1 | 0.44 % | | 2 | 0.79 % | | 13 | C C D D D C C | OF100HQ | 1 | 0.44 % | | 1 | 0.40 % | | 14 | C C D C / D | RG0F/5 | 1 | 0.44 % | | 1 | 0.40 % | | 15 | C C D D C C | ES17EU | 1 | 0.44 % | | 1 | 0.40 % | | 16 | C D / C C D C | V4/KE1B | 1 | 0.44 % | | 1 | 0.40 % | | 17 | D C D C | 4X0A | 1 | 0.44 % | | 1 | 0.40 % | |
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