ISB Adaptor RA-121 (RA-121A) (RA121A) UK version

Racal Engineering / Instruments / Electronics Ltd., Bracknell

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  • Year
  • 1965 ??
  • Category
  • Miscellaneous (Other, Various) - see notes
  • Radiomuseum.org ID
  • 106386

 Technical Specifications

  • Number of Tubes
  • 12
  • Main principle
  • ZF/IF 100/18 kHz
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 100-125; 200-250 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: ISB Adaptor RA-121 [UK version] - Racal Engineering /
  • Shape
  • Rack
  • Dimensions (WHD)
  • 19 x 5.25 x 0 inch / 483 x 133 x 0 mm
  • Notes
  • Independent Side Band Adaptor matching the RA-17 family receivers, allows reception of USB, LSB and ISB signals.
    The 100 kHz 3rd IF of the RA-17 is mixed with a 118 kHz oscillator signal for a new IF of 18 kHz. 18 kHz +/- 6 kHz bandpass filters separate the audio signal of the two sidebands, which are fed to separate audio frequency amplifiers.
    A CRT tube which produces a Lissajou figure is used for indication of correct tuning of receiver and adaptor tuning. Variants: RA-121B with US tubes and connectors, RA-121D with more stable crystal controlled 118 kHz oscillator.
  • Mentioned in
  • Racal Handbook, Rinus Jansen
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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