| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | AA5AU | 49 | 29.17 % | | 50 | 28.90 % | | 2 | C C D C C C | CT1FKN | 45 | 26.79 % | | 46 | 26.59 % | | 3 | C C D C | AA3B | 39 | 23.21 % | | 40 | 23.12 % | | 4 | C D C C | K2XR | 11 | 6.55 % | | 11 | 6.36 % | | 5 | C D C C C | I0KHY | 9 | 5.36 % | | 9 | 5.20 % | | 6 | C D D C | E72U | 6 | 3.57 % | | 7 | 4.05 % | | 7 | D C D C | 9A1A | 3 | 1.79 % | | 4 | 2.31 % | | 8 | C C / C C D C C | DL/KU1CW | 1 | 0.60 % | | 1 | 0.58 % | | 9 | D C D C C | 9A3ZI | 1 | 0.60 % | | 1 | 0.58 % | | 10 | C C D C C C / D | IT9RGY/4 | 1 | 0.60 % | | 1 | 0.58 % | | 11 | C C D D C | OG73X | 1 | 0.60 % | | 1 | 0.58 % | | 12 | C D D C C | S51JQ | 1 | 0.60 % | | 1 | 0.58 % | | 13 | C C D D D C C | SN800WL | 1 | 0.60 % | | 1 | 0.58 % | |
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