• Country
• United States of America (USA)

• Manufacturer / Brand
• Polytechnic Research & Development Co, Inc. (PRD); Brooklyn, NY

• Year
• 1950 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 133388

• 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: Broadband Probe 250-A - Polytechnic Research &

• Notes
• 1 to 12.4GHz probe, with adiustments for accepting either crystal or bolometer detector.

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

• Other Models

• Here you find 11 models, 2 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Polytechnic Research & Development Co, Inc. (PRD); Brooklyn, NY