| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
|---|
| 1 | C D C C C | K0IZI | 68 | 38.20 % | | 72 | 35.12 % | | | 2 | C D C C | K1BZ | 39 | 21.91 % | | 40 | 19.51 % | | | 3 | C C D C C C | IK5FKF | 36 | 20.22 % | | 39 | 19.02 % | | | 4 | C C D C C | AC2XC | 17 | 9.55 % | | 18 | 8.78 % | | | 5 | C C D C | AJ4A | 12 | 6.74 % | | 13 | 6.34 % | | | 6 | C D C | K9A | 6 | 3.37 % | | 6 | 2.93 % | |
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