| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AJW | 436 | 34.80 % | | 542 | 35.31 % | | 2 | C D C C | K0BT | 247 | 19.71 % | | 298 | 19.41 % | | 3 | C C D C C C | CG6YMM | 237 | 18.91 % | | 282 | 18.37 % | | 4 | C C D C C | AA1HF | 188 | 15.00 % | | 227 | 14.79 % | | 5 | C C D C | AA8M | 102 | 8.14 % | | 125 | 8.14 % | | 6 | C D C | K0K | 33 | 2.63 % | | 49 | 3.19 % | | 7 | C C D C C C / C | KE7UIU/M | 2 | 0.16 % | | 2 | 0.13 % | | 8 | C C D C C / D | KG6JE/7 | 2 | 0.16 % | | 4 | 0.26 % | | 9 | C D C C C / D | K5KUA/5 | 1 | 0.08 % | | 1 | 0.07 % | | 10 | C C D C / C C D | NQ5L/VE6 | 1 | 0.08 % | | 1 | 0.07 % | | 11 | C C D C C / C | VA7ZR/M | 1 | 0.08 % | | 1 | 0.07 % | | 12 | C C D C C C / C C D | VE6BGL/VE5 | 1 | 0.08 % | | 1 | 0.07 % | | 13 | C D C C D C | W7BI2F | 1 | 0.08 % | | 1 | 0.07 % | | 14 | C C D C C C C | WA6KFIX | 1 | 0.08 % | | 1 | 0.07 % | |
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