• Country
• United States of America (USA)

• Manufacturer / Brand
• Palomar Engineers Inc.; Escondido, CA

• Year
• 1977 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 189006

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

• Number of Transistors
• 3

• Semiconductors
• 2N5770 2N5770 2N5770 1N5227

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Dry Batteries / 9 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Noise Bridge R-X - Palomar Engineers Inc.;

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

• Dimensions (WHD)
• 15.5 x 31 x 99 mm / 0.6 x 1.2 x 3.9 inch

• Notes
• The R-X Noise Bridge contains a wideband noise generator and an RF impedance bridge. A shortwave receiver is used as the detector. The useful range on the Noise Bridge is 1-100 MHz. It measures R= 0-250 ohms and C= +/- 70 pF. Dial accuracy is about 2 pF.
  
  The related XC value (capacitive impedance in ohms) is calculated by formula XC = 159154*(1/(70-C)-1/70)/F and the related XL value (inductive impedance in ohms) is calculated by formula XL = 159154*(1/70-1/(70+C))/F.
  C is the value of the scale reading at the noise bridge (in pF) and F is the frequency of the receiver used as detector (in MHz).

• Net weight (2.2 lb = 1 kg)
• 0.350 kg / 0 lb 12.3 oz (0.771 lb)

• Source of data
• -- Original-techn. papers.

• Literature/Schematics (1)
• -- Schematic

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

• Other Models

• Here you find 4 models, 4 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Palomar Engineers Inc.; Escondido, CA