| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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| 1 | C D C C | K1AR | 55 | 45.08 % | | 62 | 46.27 % | | | 2 | C D C C C | K3CCR | 32 | 26.23 % | | 34 | 25.37 % | | | 3 | C C D C C | AA4AK | 12 | 9.84 % | | 12 | 8.96 % | | | 4 | C C D C | AA3B | 10 | 8.20 % | | 10 | 7.46 % | | | 5 | C D C | K1R | 7 | 5.74 % | | 9 | 6.72 % | | | 6 | C C D C C C | VE2CWI | 6 | 4.92 % | | 7 | 5.22 % | |
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