| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0OTR | 47 | 43.12 % | | 48 | 43.64 % | | 2 | C D C C | K1AA | 34 | 31.19 % | | 34 | 30.91 % | | 3 | C C D C C | AA4MF | 14 | 12.84 % | | 14 | 12.73 % | | 4 | C C D C C C | KA3PMW | 8 | 7.34 % | | 8 | 7.27 % | | 5 | C C D C | KK6D | 4 | 3.67 % | | 4 | 3.64 % | | 6 | C D C | K1B | 2 | 1.83 % | | 2 | 1.82 % | |
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