• Country
• United States of America (USA)

• Manufacturer / Brand
• Tektronix; Portland, OR

• Year
• 1967–1979

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 214792

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

• Number of Tubes
• 4

• Valves / Tubes
• Y1641 Y1641 154-0510-00 154-0502-XX

• Number of Transistors
• 89

• Semiconductors

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Alternating Current supply (AC) / 115; 230 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Spectrum Analyzer 491 - Tektronix; Portland, OR

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 317.5 x 184.1 x 596.9 mm / 12.5 x 7.2 x 23.5 inch

• Notes
• The Type 491 Spectrum Analyzer is a wide band, general purpose portable spectrum analyzer with an RF center frequency range from 10 MHz to 40 GHz. The analyzer displays signal amplitude as a function of frequency.
  Signals are displayed as a spectrum on a CRT screen with signal energy plotted on the vertical axis against frequency on the horizontal axis.
  Three RF Inputs.
  A) BNC from 10 to 275 MHz.
  B) N from 275 MHz to 2 GHz.
  C) N, with a Plug-in Coaxial Mixer,from 1.5 GHz to 12,4 GHz.Above up to 40 GHz are used three types of waveguide for Ku, K and Ka bands.

• Net weight (2.2 lb = 1 kg)
• 17.3 kg / 38 lb 1.7 oz (38.106 lb)

• Price in first year of sale
• 5,195.00 $

• Source of data
• - - Data from my own collection

• Author
• Model page created by Antonio Marra. See "Data change" for further contributors.

• Other Models

• Here you find 386 models, 374 with images and 92 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Tektronix; Portland, OR