| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0EA | 73 | 37.24 % | | 111 | 39.22 % | | 2 | C C D C C | AC3BU | 38 | 19.39 % | | 54 | 19.08 % | | 3 | C C D C | AD3Y | 30 | 15.31 % | | 44 | 15.55 % | | 4 | C C D C C C | BG4GOV | 25 | 12.76 % | | 29 | 10.25 % | | 5 | C D C C C | K1IMI | 16 | 8.16 % | | 19 | 6.71 % | | 6 | D C D C C | 4X6FR | 4 | 2.04 % | | 8 | 2.83 % | | 7 | D C D C C C | 5Z1TTT | 2 | 1.02 % | | 2 | 0.71 % | | 8 | D C D C | 4L2M | 1 | 0.51 % | | 2 | 0.71 % | | 9 | C D C | E2A | 1 | 0.51 % | | 1 | 0.35 % | | 10 | D C / C C D C C | 5B/RN3QO | 1 | 0.51 % | | 2 | 0.71 % | | 11 | C D D C C C | E20HSK | 1 | 0.51 % | | 2 | 0.71 % | | 12 | C C D / C D C C | KP4/K7GM | 1 | 0.51 % | | 1 | 0.35 % | | 13 | C D D C | P33W | 1 | 0.51 % | | 4 | 1.41 % | | 14 | C C D C / C | RM8W/M | 1 | 0.51 % | | 1 | 0.35 % | | 15 | C C D / C C D C C C | TA2/DL2JRM | 1 | 0.51 % | | 3 | 1.06 % | |
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