| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AV | 97 | 38.19 % | | 100 | 37.59 % | | 2 | C D C C C | K0GEO | 80 | 31.50 % | | 87 | 32.71 % | | 3 | C C D C | AA3B | 28 | 11.02 % | | 30 | 11.28 % | | 4 | C C D C C | AA4NC | 20 | 7.87 % | | 20 | 7.52 % | | 5 | C C D C C C | CG2CRO | 19 | 7.48 % | | 19 | 7.14 % | | 6 | C D C | K1G | 10 | 3.94 % | | 10 | 3.76 % | |
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