FuG 10 EK Luftwaffe radio equipment
During the the 1930s the German enterprise Lorenz AG developed the well known by now aircraft radio system FuG 10 (FunkGerät) with two wave ranges: FunkGerät 10 Emfänger Langwelle(EL) and FunkGerät 10 Empfänger Kurzwelle(EK).
Since 1939 it was the preferred system in all large aircraft (Luftwaffe) with several crew members like Henkel He 111, Messerschmidt ME 110, Junkers Ju 88 and Dornier DO 217.
According to Wikipedia military products from Lorenz during WWII included land-based and airborne radars, two-way radio sets, wire recorders, radio tubes, and Germany’s most secure communications device, the Lorenz cipher machine. Lorenz owned 25% of Focke-Wulf, the German aircraft firm that built some of the most successful Luftwaffe fighter aircraft.
FuG 10 series: are a family of transceivers for both R/T and W/T communications. The German FUG-10 panel, or rack, contained two transmitters and two receivers: One transmitter and its companion receiver operated in the MF or Longwave; 300 to 600 kHz (1,000 to 500 m) range and the other transmitter and its companion receiver operated in the HF or Shortwave range; 3 to 6 MHz (100 to 50 m). Most of the FuG 10 series used a fixed wire aerial between the fuselage and tailfin or a retractable trailing aerial wire.