| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 139 | 49.82 % | | 140 | 50.00 % | | 2 | C C D C | AA1K | 58 | 20.79 % | | 58 | 20.71 % | | 3 | C C D C C | AB3CX | 32 | 11.47 % | | 32 | 11.43 % | | 4 | C D C C C | C6AGU | 28 | 10.04 % | | 28 | 10.00 % | | 5 | C C D C C C | HB9DDO | 19 | 6.81 % | | 19 | 6.79 % | | 6 | D C D C | 4M1K | 1 | 0.36 % | | 1 | 0.36 % | | 7 | C C D C / C D | KH7X/W7 | 1 | 0.36 % | | 1 | 0.36 % | | 8 | C D C C / D | W8KA/6 | 1 | 0.36 % | | 1 | 0.36 % | |
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