| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | BD1IIJ | 615 | 44.79 % | | 985 | 49.57 % | | 2 | C C D C | AB1U | 289 | 21.05 % | | 383 | 19.28 % | | 3 | C C D C C | AC3BU | 259 | 18.86 % | | 358 | 18.02 % | | 4 | C D C C | E7CW | 68 | 4.95 % | | 79 | 3.98 % | | 5 | D C D C C C | 4E1AGW | 36 | 2.62 % | | 48 | 2.42 % | | 6 | C D C C C | F6GCP | 21 | 1.53 % | | 21 | 1.06 % | | 7 | C C D C C C / D | JA1YEV/1 | 18 | 1.31 % | | 28 | 1.41 % | | 8 | D C D C | 3G2M | 13 | 0.95 % | | 15 | 0.75 % | | 9 | C D D C | E70T | 10 | 0.73 % | | 13 | 0.65 % | | 10 | D C D C C | 3V8SS | 10 | 0.73 % | | 11 | 0.55 % | | 11 | C D D C C | S51KD | 9 | 0.66 % | | 11 | 0.55 % | | 12 | C D D C C C | E20HHK | 6 | 0.44 % | | 7 | 0.35 % | | 13 | C D C | D4F | 6 | 0.44 % | | 8 | 0.40 % | | 14 | C C D D C | LX20I | 3 | 0.22 % | | 4 | 0.20 % | | 15 | C C D D C C C | PA75PKZ | 2 | 0.15 % | | 2 | 0.10 % | | 16 | D C D C C C / D | 7K1MAG/2 | 2 | 0.15 % | | 7 | 0.35 % | | 17 | C C D D D C C | OL901AB | 2 | 0.15 % | | 2 | 0.10 % | | 18 | D C D D C C C C | 8J17CALL | 1 | 0.07 % | | 2 | 0.10 % | | 19 | C C D D C C | OG30YL | 1 | 0.07 % | | 1 | 0.05 % | | 20 | C C D C C C / C C C | JA2CJE/QRP | 1 | 0.07 % | | 1 | 0.05 % | | 21 | C D C C / D | W1YY/7 | 1 | 0.07 % | | 1 | 0.05 % | |
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