| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0QIK | 59 | 39.60 % | | 59 | 38.06 % | | 2 | C D C C | K1DS | 35 | 23.49 % | | 35 | 22.58 % | | 3 | C C D C C C | KB0FXC | 31 | 20.81 % | | 31 | 20.00 % | | 4 | C C D C C | AA4RO | 15 | 10.07 % | | 15 | 9.68 % | | 5 | C C D C | KP3J | 7 | 4.70 % | | 7 | 4.52 % | | 6 | C D C | N3Y | 2 | 1.34 % | | 2 | 1.29 % | |
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