| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
|---|
| 1 | C D C C | K1OA | 27 | 47.37 % | | 27 | 42.86 % | | | 2 | C D C C C | K0KKV | 16 | 28.07 % | | 16 | 25.40 % | | | 3 | C C D C | AJ4A | 6 | 10.53 % | | 6 | 9.52 % | | | 4 | C C D C C C | KB9OHY | 4 | 7.02 % | | 4 | 6.35 % | | | 5 | C D C | K1C | 2 | 3.51 % | | 2 | 3.17 % | | | 6 | C C D C C | KM0DX | 2 | 3.51 % | | 2 | 3.17 % | |
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