Call Letters Meaning on Wikipedia

Sid Schweiger
Thu Jun 13 16:09:12 EDT 2019

"When additional call signs needed to be assigned, somone had the idea of 
adding an extra dash to the prefixes: didahdah = W, dahdidah = K."
My understanding is that it was radio's early experimenters who started using call signs (a scheme originated by telegraph stations) prefixed with "W"...for "wireless."

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