More than 13,000 Conversos were put on trial during the first 12 years of the Spanish Inquisition. Hoping to eliminate ties between the Jewish community and Conversos, the Jews of Spain were expelled in 1492 ..
A second reason, specifically for using Morse Code during the Second World War, was encoding... Nowadays equipment exists to take an outgoing radio signal and automatically encrypt the data or voices during transmission, this is 'on-line' encryption...
Wireless was used to provide communication to and from submarines in the First World War. The D-class submarine was the first submarine class to be fitted with wireless transmitters in 1907. With time the type, range and bandwidth of the communications systems have increased.