*Einheitsbedienungsgerät (EBG) Type 1
*The EBG served as a "Standard Control Unit" linking the S406 high-frequency (HF) transmitter and the E437 S or other main receiver.
*In addition, the EBG served as a power connection,
Morse Code key connection, and a microphone connection.
Photo by Bruce Culp
Photo by kind permission of the German Navel Association