| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 82 | 29.18 % | | 128 | 31.37 % | | 2 | C C D C C | AB3CV | 77 | 27.40 % | | 105 | 25.74 % | | 3 | C C D C | AB9H | 54 | 19.22 % | | 83 | 20.34 % | | 4 | C C D C C C | BD4TUC | 27 | 9.61 % | | 36 | 8.82 % | | 5 | C D C C C | K0LUZ | 23 | 8.19 % | | 26 | 6.37 % | | 6 | D C D C C | 4X6FR | 7 | 2.49 % | | 13 | 3.19 % | | 7 | C D D C | A42K | 2 | 0.71 % | | 3 | 0.74 % | | 8 | D C D C C C | 5B4APL | 2 | 0.71 % | | 3 | 0.74 % | | 9 | D C D C | 4L2M | 1 | 0.36 % | | 3 | 0.74 % | | 10 | C D C | E2A | 1 | 0.36 % | | 1 | 0.25 % | | 11 | C D D C C | E27EK | 1 | 0.36 % | | 1 | 0.25 % | | 12 | C D D C C C | E29TGW | 1 | 0.36 % | | 1 | 0.25 % | | 13 | C C D C C / C | LU1AW/X | 1 | 0.36 % | | 1 | 0.25 % | | 14 | C C D C C / C C | RA0LQ/MM | 1 | 0.36 % | | 1 | 0.25 % | | 15 | C C D C / D | ZR2A/4 | 1 | 0.36 % | | 3 | 0.74 % | |
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