| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0DEQ | 80 | 39.02 % | | 80 | 37.56 % | | 2 | C D C C | K0VU | 41 | 20.00 % | | 41 | 19.25 % | | 3 | C C D C C C | KA5IFX | 35 | 17.07 % | | 35 | 16.43 % | | 4 | C C D C C | AA4HV | 26 | 12.68 % | | 26 | 12.21 % | | 5 | C C D C | AF5U | 15 | 7.32 % | | 15 | 7.04 % | | 6 | C D C | K5K | 8 | 3.90 % | | 8 | 3.76 % | |
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