| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 77 | 48.43 % | | 77 | 48.43 % | | 2 | C D C C C | K0ACP | 26 | 16.35 % | | 26 | 16.35 % | | 3 | C C D C | AA3B | 23 | 14.47 % | | 23 | 14.47 % | | 4 | C C D C C | AA1JM | 20 | 12.58 % | | 20 | 12.58 % | | 5 | C C D C C C | KA6BIM | 12 | 7.55 % | | 12 | 7.55 % | | 6 | C C D C / D | NE8O/4 | 1 | 0.63 % | | 1 | 0.63 % | |
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