• Country
• United States of America (USA)

• Manufacturer / Brand
• Tompkins Radio Products; Refugio Texas

• Year
• 1968–1975

• Category
• Pre-stage (adaptor for SW/FM/VHF/UHF incl. built-in), Frequency converter

• Radiomuseum.org ID
• 356214

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

• Number of Transistors
• 2

• Semiconductors

• Main principle
• RF Converter/Adapter (not voltage converter)

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Short Wave (SW only)

• Power type and voltage
• Dry Batteries / 1 x 9 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Tunaverter 348X - Tompkins Radio Products;

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

• Dimensions (WHD)
• 115 x 60 x 100 mm / 4.5 x 2.4 x 3.9 inch

• Notes

• Coverage: 33 - 48 MHz
  Output:  1500 kHz

  The on/off switch also switches the output directly to car aerial or to Tunaverter output.

  For use at a radio with a ferrite antenna, there is no connection to the receiver. The output is coupled via a short wire or resonant antenna, e.g., with a coupling loop 2.5" in diameter for #20 to 32 enamel wire, C = 240 pf, L = 18 turns for 1500 kHz output.

  All VHF Tunaverters have a 3-section tuning capacitor.

  The X models have a fixed crystal front panel plug-in option for a fixed frequency channel. Crystals cost 5.10 USD. Slide the XTAL switch to ON for crystal-controlled frequency, or slide to the other position (not ON) to use as a standard frequency band converter.

• Price in first year of sale
• 32.95 USD

• Mentioned in
• -- Collector info (Sammler)

• Author
• Model page created by Heribert Jung. See "Data change" for further contributors.

• Other Models

• Here you find 10 models, 4 with images and 9 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Tompkins Radio Products; Refugio Texas