• Country
• Japan

• Manufacturer / Brand
• Yaesu-Musen Co. Ltd.; Tokyo

• Year
• 1990 ?

• Category
• Amateur Equipment (Other, but not Key)

• Radiomuseum.org ID
• 270967

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 1

• Semiconductors

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Powered by external power supply or a main unit.

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Relay Box FRB-757 - Yaesu-Musen Co. Ltd.; Tokyo

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 41 x 32 x 70 mm / 1.6 x 1.3 x 2.8 inch

• Notes

• The Relay Box incorporates a transistor switch and an extra heavy duty relay for controlling all types of linear amplifier without endangering the delicate internal switching circuitry of the Yaesu FT-757GX HF transceiver; suitable for any linear amplifier with T/R relays that require voltage in excess of 50V, and/or current in excess of 300 mA; suitable for Yaesu FT-747GX transceiver too.

• Net weight (2.2 lb = 1 kg)
• 0.2 kg / 0 lb 7 oz (0.441 lb)

• Mentioned in
• -- Original-techn. papers.

• Author
• Model page created by Emilio Focosi. See "Data change" for further contributors.

• Other Models

• Here you find 305 models, 289 with images and 139 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Yaesu-Musen Co. Ltd.; Tokyo