| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0DDS | 123 | 35.34 % | | 128 | 35.26 % | | 2 | C D C C | K1PH | 82 | 23.56 % | | 84 | 23.14 % | | 3 | C C D C C C | KA3KSP | 68 | 19.54 % | | 70 | 19.28 % | | 4 | C C D C C | AA1HF | 50 | 14.37 % | | 53 | 14.60 % | | 5 | C C D C | AC1L | 16 | 4.60 % | | 18 | 4.96 % | | 6 | C D C | K4T | 9 | 2.59 % | | 10 | 2.75 % | |
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