| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
|---|
| 1 | C D C C C | K0IZI | 76 | 34.23 % | | 82 | 32.28 % | | | 2 | C D C C | K1BZ | 54 | 24.32 % | | 55 | 21.65 % | | | 3 | C C D C C C | IK5FKF | 49 | 22.07 % | | 53 | 20.87 % | | | 4 | C C D C C | AB3GY | 20 | 9.01 % | | 21 | 8.27 % | | | 5 | C C D C | AJ4A | 17 | 7.66 % | | 18 | 7.09 % | | | 6 | C D C | K9A | 6 | 2.70 % | | 6 | 2.36 % | |
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