| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | AA1W | 356 | 27.36 % | | 526 | 31.76 % | | 2 | C C D C C | AA1LS | 306 | 23.52 % | | 372 | 22.46 % | | 3 | C C D C C C | CA3JBD | 231 | 17.76 % | | 257 | 15.52 % | | 4 | C D C C C | F1AGR | 190 | 14.60 % | | 222 | 13.41 % | | 5 | C D C C | E7DX | 152 | 11.68 % | | 188 | 11.35 % | | 6 | C D D C | E73M | 14 | 1.08 % | | 21 | 1.27 % | | 7 | D C D C | 3G1D | 11 | 0.85 % | | 16 | 0.97 % | | 8 | C D D C C | J69KZ | 11 | 0.85 % | | 12 | 0.72 % | | 9 | C D C | D4C | 7 | 0.54 % | | 11 | 0.66 % | | 10 | C C D D C | LY29A | 5 | 0.38 % | | 8 | 0.48 % | | 11 | C C D D C C C | CS25FOQ | 5 | 0.38 % | | 6 | 0.36 % | | 12 | D C D C C | 5T5PA | 3 | 0.23 % | | 3 | 0.18 % | | 13 | D C D C C C | 2E0KWL | 3 | 0.23 % | | 3 | 0.18 % | | 14 | C C D D C C | EI19RE | 2 | 0.15 % | | 4 | 0.24 % | | 15 | C C D D D C | EE100V | 1 | 0.08 % | | 1 | 0.06 % | | 16 | D C D D C | 9A73A | 1 | 0.08 % | | 3 | 0.18 % | | 17 | C C / C C D C C | LU/DL2OE | 1 | 0.08 % | | 1 | 0.06 % | | 18 | D C D D D C | 9A775O | 1 | 0.08 % | | 1 | 0.06 % | | 19 | C D C C C / C C D | W5MIL/HR9 | 1 | 0.08 % | | 1 | 0.06 % | |
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