| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0BFT | 33 | 44.59 % | | 33 | 44.00 % | | 2 | C D C C | K9HD | 14 | 18.92 % | | 14 | 18.67 % | | 3 | C C D C C C | KA8FQS | 13 | 17.57 % | | 13 | 17.33 % | | 4 | C C D C | AB0R | 6 | 8.11 % | | 6 | 8.00 % | | 5 | C C D C C | AA4LR | 5 | 6.76 % | | 5 | 6.67 % | | 6 | C D C | K4R | 2 | 2.70 % | | 2 | 2.67 % | | 7 | C C D D | NK40 | 1 | 1.35 % | | 1 | 1.33 % | |
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