| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
|---|
| 1 | C D C C C | K0KWC | 109 | 38.79 % | | 109 | 34.60 % | | | 2 | C C D C C C | HR5PAR | 60 | 21.35 % | | 60 | 19.05 % | | | 3 | C D C C | K0FV | 42 | 14.95 % | | 42 | 13.33 % | | | 4 | C C D C C | AA4RB | 39 | 13.88 % | | 39 | 12.38 % | | | 5 | C C D C | AA5R | 20 | 7.12 % | | 20 | 6.35 % | | | 6 | C D C | K4B | 11 | 3.91 % | | 11 | 3.49 % | |
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