| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0EA | 81 | 29.24 % | | 117 | 28.89 % | | 2 | C C D C C | AC5XK | 58 | 20.94 % | | 80 | 19.75 % | | 3 | C C D C | AB2E | 57 | 20.58 % | | 91 | 22.47 % | | 4 | C C D C C C | CT9ABV | 40 | 14.44 % | | 46 | 11.36 % | | 5 | C D C C C | G3ILO | 27 | 9.75 % | | 33 | 8.15 % | | 6 | D C D C C | 4K6FO | 3 | 1.08 % | | 5 | 1.23 % | | 7 | C D C | D4L | 3 | 1.08 % | | 8 | 1.98 % | | 8 | D C D C C C | 5B4APL | 2 | 0.72 % | | 2 | 0.49 % | | 9 | D C D C | 4L2M | 2 | 0.72 % | | 4 | 0.99 % | | 10 | C D D C | A60A | 1 | 0.36 % | | 3 | 0.74 % | | 11 | C D C C C C | E2WRTC | 1 | 0.36 % | | 3 | 0.74 % | | 12 | C D D C C C | E21YDP | 1 | 0.36 % | | 1 | 0.25 % | | 13 | C D D C C | V31MA | 1 | 0.36 % | | 1 | 0.25 % | |
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