| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0BBC | 305 | 26.07 % | | 371 | 24.63 % | | 2 | C C D C C C | CO2VDD | 278 | 23.76 % | | 332 | 22.05 % | | 3 | C D C C | K0AD | 236 | 20.17 % | | 337 | 22.38 % | | 4 | C C D C C | AA1ON | 186 | 15.90 % | | 244 | 16.20 % | | 5 | C C D C | AA0Z | 159 | 13.59 % | | 214 | 14.21 % | | 6 | C D C C C / D | K6WDE/7 | 4 | 0.34 % | | 6 | 0.40 % | | 7 | C D C C / D | K2ZR/4 | 1 | 0.09 % | | 1 | 0.07 % | | 8 | C C D C C / C | KG0SI/P | 1 | 0.09 % | | 1 | 0.07 % | |
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