| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 141 | 32.79 % | | 235 | 35.29 % | | 2 | C C D C C | AA0AI | 78 | 18.14 % | | 115 | 17.27 % | | 3 | C C D C | AA3B | 78 | 18.14 % | | 130 | 19.52 % | | 4 | C D C C C | K1ARO | 55 | 12.79 % | | 69 | 10.36 % | | 5 | C C D C C C | BG7BDB | 52 | 12.09 % | | 67 | 10.06 % | | 6 | D C D C C | 4X4DZ | 10 | 2.33 % | | 21 | 3.15 % | | 7 | D C D C | 4J6R | 3 | 0.70 % | | 4 | 0.60 % | | 8 | C D D C | L33M | 2 | 0.47 % | | 5 | 0.75 % | | 9 | C D C | E2A | 2 | 0.47 % | | 5 | 0.75 % | | 10 | C D D C C | A45WG | 2 | 0.47 % | | 3 | 0.45 % | | 11 | C C / C C D C C | FH/DJ9RR | 1 | 0.23 % | | 3 | 0.45 % | | 12 | C D D C C C | E21YDP | 1 | 0.23 % | | 2 | 0.30 % | | 13 | C D C C / D | K9JF/7 | 1 | 0.23 % | | 1 | 0.15 % | | 14 | C D C C C / D | K9QVB/9 | 1 | 0.23 % | | 1 | 0.15 % | | 15 | C C D / C C D C C | BY5/DF9LJ | 1 | 0.23 % | | 1 | 0.15 % | | 16 | C C D C C / C C | RA0LQ/MM | 1 | 0.23 % | | 3 | 0.45 % | | 17 | C C D / C C D C C C | VP9/DL1YAF | 1 | 0.23 % | | 1 | 0.15 % | |
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