Tunable Bolometer Mounts 475

Hewlett-Packard, (HP); Palo Alto, CA

Data
Forum
Pictures
Collections

  • Year
  • 1952
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 219927

 Technical Specifications

  • Main principle
  • none
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Tunable Bolometer Mounts 475 - Hewlett-Packard, HP; Palo Alto
  • Shape
  • Tablemodel, with any shape - general.
  • Notes
  • The HP tunable bolometer mounts HP 475A and 475B are accurate and tunable over a broad band, they have universal application.
    They are essentially double stub tuners, designed to couple energy from a 50 ohm coaxial microwave system into a 200 ohm bolometer. The rf energy absorbed by the bolometer is measured by means of a bolometer bridge or by using a self-balancing bridge such as the HP 430A Microwave Power Meter. With this combination of equipment, microwave power may be measured directly at frequencies from 300 to 1,000 Mc (HP 475A) or 800 to 4,000 Mc (HP 475B).
    Both instruments are similar in construction. Two shorting stubs are rigidly positioned in shunt with a transmission line section and are spaced 1/2 wave apart at a frequency above the transmission range. Shorting stubs are varied by two controls actuating sliding contact fingers. The transmission line section terminates in a power-sensitive element which may have resistance values ranging from 100 to 200 ohms.

    HP 475A Tunable Bolometer Mount
    Frequency: approx. 300 to 1,000 Mc. (Varies with VSWR, phase of source and value of bolometer load.)
    Fittings: Type N female (UG23/U) (Incoming power) BNC Type (UG89/U) bolometer dc connection. Output will accept Type N connector fitting so mount may be used as a conventional double-stub transformer.
    Power Range: 0.1 mW to 10 mW full scale (with -hp- 430A). Power Sensitive Element: 1/100 ampere instrument fuse, Sperry Barretter 821, Western Electric Type D166382 Thermistor
    Size: 9¾" x 34". 2" deep.

    HP 475B Tunable Bolometer Mount
    Frequency: approx. 800 to 4,000 Mc. (Varies with VSWR, phase of source and value of bolometer load.)
    Size: 7½" x 15". 3½" deep.
  • Mentioned in
  • -- Original prospect or advert (HP UHF Catalog 1952)
  • Author
  • Model page created by Pius Steiner. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum