| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0OTP | 167 | 40.83 % | | 167 | 40.14 % | | 2 | C C D C C C | KA0ZOZ | 98 | 23.96 % | | 98 | 23.56 % | | 3 | C D C C | K0SW | 63 | 15.40 % | | 63 | 15.14 % | | 4 | C C D C C | AA8BN | 44 | 10.76 % | | 44 | 10.58 % | | 5 | C C D C | AK0F | 21 | 5.13 % | | 21 | 5.05 % | | 6 | C D C | K4T | 15 | 3.67 % | | 15 | 3.61 % | | 7 | C C D D C C | AC80QX | 1 | 0.24 % | | 1 | 0.24 % | |
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