| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 106 | 26.77 % | | 127 | 28.10 % | | 2 | C D C C C | K0AJW | 100 | 25.25 % | | 112 | 24.78 % | | 3 | C C D C C C | KA5UMD | 67 | 16.92 % | | 73 | 16.15 % | | 4 | C C D C | AA3B | 63 | 15.91 % | | 74 | 16.37 % | | 5 | C C D C C | AA0BV | 51 | 12.88 % | | 57 | 12.61 % | | 6 | C D C | K1B | 6 | 1.52 % | | 6 | 1.33 % | | 7 | C C D C C / D | AB5ZA/7 | 2 | 0.51 % | | 2 | 0.44 % | | 8 | C C D C / D | AI0Y/9 | 1 | 0.25 % | | 1 | 0.22 % | |
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