| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AOM | 174 | 37.66 % | | 186 | 37.50 % | | 2 | C D C C | K0ND | 105 | 22.73 % | | 115 | 23.19 % | | 3 | C C D C C C | KA0GOA | 71 | 15.37 % | | 75 | 15.12 % | | 4 | C C D C C | AA0RW | 65 | 14.07 % | | 69 | 13.91 % | | 5 | C C D C | AC4Q | 30 | 6.49 % | | 31 | 6.25 % | | 6 | C D C | K0N | 16 | 3.46 % | | 19 | 3.83 % | | 7 | C C D C C C / C | KC6IKI/M | 1 | 0.22 % | | 1 | 0.20 % | |
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