3 cm Electromagnetic Wave Apparatus 044.571, 045.671, 042.871

Unilab; Blackburn, Lancashire

  • Year
  • 1956–1979
  • Category
  • Teaching aids-material
  • Radiomuseum.org ID
  • 347179

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

 Technical Specifications

  • Number of Tubes
  • 3
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Alternating Current supply (AC) / 220 Volt
  • Material
  • Bakelite or Plastics (type unknown)
  • from Radiomuseum.org
  • Model: 3 cm Electromagnetic Wave Apparatus 044.571, 045.671, 042.871 - Unilab; Blackburn, Lancashire
  • Shape
  • Tablemodel, with any shape - general.
  • Notes
  • 3 cm Electromagnetic Wave Apparatus.


    • Klystron power supply & an oscillator (042.871)
    • 3 cm microwave Klystron transmitter and antenna (044.571)
    •  3 cm microwave receiver and antenna 9 (045.673).

    This set was commonly used by students of the School of Physical and Chemical Sciences to conduct experiments to test for polarisation, rotation of the plane of polarisation, optical activity analogue, diffraction, and interference at microwave frequencies.

    The power supply unit 042.871 provides the heating voltage required to operate the reflex klystronas well as the resonator voltage and reflector voltage.

    The modulation can be switched between off, 100Hz, and 1kHz via a rotary switch.

    The 100 Hz is taken from the full-wave rectifier by switching off the smoothing of the reflector voltage.

    The 1 kHz are generated via an internal resonant circuit fed back to a system of the ECC82, which is inductively coupled to the reflector voltage.

    The second system of the ECC82 remains unused.

    It is possible to couple an external modulation signal into the reflector circuit, in the normal state this is closed by a short-circuit plug.

    The Transmitter 044.571 incorporates the reflex Klystron which is adjusted to produce a wavelength of 3.2 cm (10 GHz) at approximately 25 mW.

    The Receiver 045.673 incorporates a silicon microwave diode mounted in a resonant cavity across the waveguide and the rectified signal is indicated directly on the inbuilt 100 uA meter.

  • Mentioned in
  • - - Manufacturers Literature (Unilab Notes for Use No. 1)
  • Author
  • Model page created by Konstantin Kalthof. See "Data change" for further contributors.

 Collections | Museums | Literature


The model 3 cm Electromagnetic Wave Apparatus is part of the collections of the following members.