• Country
• Germany

• Manufacturer / Brand
• Radiofrequenz GmbH; Berlin-Friedenau (später Loewe)

• Year
• 1925/1926

• Category
• Radio module post 1925 (not a part, not a key)

• Radiomuseum.org ID
• 16281

• • Brand: Ges. für Radiotelephonie mbH

• Main principle
• RF-Circuit or wave trap (separate, can also be an antenna with amp.)

• Tuned circuits
• 1 AM circuit(s)

• Wave bands
• Broadcast (MW) and Long Wave.

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Universal-Siebkreis SB180 - Radiofrequenz GmbH; Berlin-

• Notes
• z.B. für HF332 oder EA991; Sekundärwindung mit Drehko, parallel- oder seriel-Schaltung.

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Other Models

• Here you find 29 models, 19 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radiofrequenz GmbH; Berlin-Friedenau (später Loewe)