A silent key (SK) is a deceased amateur radio operator. The "key" is a reference to the telegraph keys historically used to transmit Morse code.
When a ham dies, the "silent key" symbolize that their transmissions will not be heard again.
Current silent keys from the East Alabama Amateur Radio Club are:
KE4NXF Betty Cummings 2020
KJ4RKB Brian "Red" Hinkle 2020
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Last Updated: May 1, 2021