| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0BJ | 111 | 30.49 % | | 174 | 28.71 % | | 2 | C C D C C | AA4CF | 78 | 21.43 % | | 138 | 22.77 % | | 3 | C C D C | AA3B | 57 | 15.66 % | | 109 | 17.99 % | | 4 | C C D C C C | EA8BQM | 43 | 11.81 % | | 55 | 9.08 % | | 5 | C D C C C | K0AAS | 41 | 11.26 % | | 51 | 8.42 % | | 6 | D C D C C | 3B9FR | 12 | 3.30 % | | 32 | 5.28 % | | 7 | D C D C | 4J5A | 5 | 1.37 % | | 9 | 1.49 % | | 8 | C D D C C | A45WG | 3 | 0.82 % | | 9 | 1.49 % | | 9 | D C D C C C | 7K4QOK | 2 | 0.55 % | | 2 | 0.33 % | | 10 | C D C C / D | K7OM/4 | 2 | 0.55 % | | 2 | 0.33 % | | 11 | C D D C C C | E21YDP | 1 | 0.27 % | | 2 | 0.33 % | | 12 | C C / C C D C C | FR/DJ9RR | 1 | 0.27 % | | 2 | 0.33 % | | 13 | D C D / C C D C C C |
9M2/JE1SCJ | 1 | 0.27 % | | 1 | 0.17 % | | 14 | C C D C C / D | BA1GN/8 | 1 | 0.27 % | | 1 | 0.17 % | | 15 | C D C C C / D | K9QVB/9 | 1 | 0.27 % | | 1 | 0.17 % | | 16 | C C D C C / C C D | KL7SB/VY2 | 1 | 0.27 % | | 4 | 0.66 % | | 17 | C D D C | P33W | 1 | 0.27 % | | 5 | 0.83 % | | 18 | C D C | P3F | 1 | 0.27 % | | 4 | 0.66 % | | 19 | C D / C C D C C | P4/DK3YD | 1 | 0.27 % | | 3 | 0.50 % | | 20 | C C D D C C / D | YB71RI/1 | 1 | 0.27 % | | 2 | 0.33 % | |
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