| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0EJ | 48 | 29.09 % | | 64 | 30.77 % | | 2 | C C D C | AA3B | 41 | 24.85 % | | 55 | 26.44 % | | 3 | C C D C C | AA4NP | 41 | 24.85 % | | 47 | 22.60 % | | 4 | C D C C C | K0LUZ | 14 | 8.48 % | | 17 | 8.17 % | | 5 | C C D C C C | JA1BJI | 13 | 7.88 % | | 15 | 7.21 % | | 6 | D C D C C | 4X6FR | 3 | 1.82 % | | 3 | 1.44 % | | 7 | D C D C | 4L2M | 2 | 1.21 % | | 3 | 1.44 % | | 8 | C D D C | L33M | 2 | 1.21 % | | 3 | 1.44 % | | 9 | C C D C / D | ZR2A/4 | 1 | 0.61 % | | 1 | 0.48 % | |
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