|  Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % | 
|---|
 | 1 | C D C C  | K0AD | 425 | 45.60 % |  | 851 | 50.00 % |  |  | 2 | C D C C C  | K0ARY | 185 | 19.85 % |  | 304 | 17.86 % |  |  | 3 | C C D C  | AA1K | 155 | 16.63 % |  | 293 | 17.22 % |  |  | 4 | C C D C C  | AA0AI | 96 | 10.30 % |  | 153 | 8.99 % |  |  | 5 | C C D C C C  | AK5CMI | 66 | 7.08 % |  | 92 | 5.41 % |  |  | 6 | C D C C / D  | W1AW/6 | 2 | 0.21 % |  | 6 | 0.35 % |  |  | 7 | C D C C / C C D  | N2WQ/VE3 | 1 | 0.11 % |  | 1 | 0.06 % |  |  | 8 | C D / C C D C C C  | W1/YO7ARY | 1 | 0.11 % |  | 1 | 0.06 % |  |  | 9 | C C D C C C / C D  | VE3JDF/W4 | 1 | 0.11 % |  | 1 | 0.06 % |  |  
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