Silent key
silent key (German: silent key ) is a term from amateur radio . It is attached to a radio station callsign to inform other radio operators that the owner of the callsign has passed away. The suffix SK is added to the callsign , separated by a slash. An example would be: DL1XYZ / SK . Silent key information is also used in amateur radio media such as association and club news for the remembrance of deceased radio operators.
General industrial engineering
In the international radio operating technology for commercial radio services and partly also in the amateur radio service, Morse code telegraphy , radio telex such as RTTY , AMTOR , PACTOR or other digital modes such as PSK31 SK are used as meaning for traffic closure. SK is transmitted at the end of a transmission after a space.