| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | AA1K | 105 | 36.84 % | | 111 | 37.50 % | | 2 | C D C C | K0EJ | 79 | 27.72 % | | 81 | 27.36 % | | 3 | C C D C C | AA1ON | 53 | 18.60 % | | 55 | 18.58 % | | 4 | C D C C C | F6EXV | 17 | 5.96 % | | 17 | 5.74 % | | 5 | C C D C C C | DL2ARD | 13 | 4.56 % | | 13 | 4.39 % | | 6 | C D D C | J42L | 5 | 1.75 % | | 6 | 2.03 % | | 7 | C D C | C4W | 5 | 1.75 % | | 5 | 1.69 % | | 8 | D C D C | 4O3A | 4 | 1.40 % | | 4 | 1.35 % | | 9 | C D D C C | E73AA | 2 | 0.70 % | | 2 | 0.68 % | | 10 | C C D D C C | EO50FF | 1 | 0.35 % | | 1 | 0.34 % | | 11 | D C D C C | 9A3TR | 1 | 0.35 % | | 1 | 0.34 % | |
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