| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0ACP | 441 | 39.23 % | | 531 | 40.17 % | | 2 | C D C C | K0ND | 256 | 22.78 % | | 312 | 23.60 % | | 3 | C C D C C C | KA0GOA | 190 | 16.90 % | | 205 | 15.51 % | | 4 | C C D C C | AA0RW | 121 | 10.77 % | | 141 | 10.67 % | | 5 | C C D C | AB8I | 75 | 6.67 % | | 83 | 6.28 % | | 6 | C D C | K0E | 38 | 3.38 % | | 47 | 3.56 % | | 7 | C C D C C C / C | KC6IKI/M | 1 | 0.09 % | | 1 | 0.08 % | | 8 | C C D D C C | KM40VT | 1 | 0.09 % | | 1 | 0.08 % | | 9 | C D D C C | W82PF | 1 | 0.09 % | | 1 | 0.08 % | |
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