• Year
  • 1960 ??
  • Category
  • Miscellaneous (Other, Various) - see notes
  • Radiomuseum.org ID
  • 106381

 Technical Specifications

  • Number of Tubes
  • 16
  • 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-98 - Racal Engineering /
  • Shape
  • Rack
  • Dimensions (WHD)
  • 483 x 133 x 355 mm / 19 x 5.2 x 14 inch
  • Notes
  • Independent Side Band Adaptor matching the RA-17 family receivers, allows reception of USB, LSB and ISB signals.
    This adaptor is equipped with a motor driven AFC system locking on pilot carrier for ISB / ECSS reception. The AFC must kept switched off for SSB signals without any carrier.
    The 100 kHz 3rd IF of the RA-17 is mixed with an LC (only in variant RA-98D crystal controlled) 118 kHz oscillator signal for a new IF of 18 kHz. By mixing with another 18 kHz oscillator signal, the audio information of both sidebands is extracted.
    Variants: RA-98A / B similar with different connectors, RA-98C with extended low frequency audio response to 150 Hz for receiving commercial broadcast transmissions (ISB feeders), RA-98D with internal crystal controlled 118 kHz oscillator for reception of SSB signals without carrier, RA-98E with an additional transistorized coupling circuit for use with transistorized receivers (as RA-1217).
  • Net weight (2.2 lb = 1 kg)
  • 17.3 kg / 38 lb 1.7 oz (38.106 lb)
  • Mentioned in
  • Racal Handbook, Rinus Jansen
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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Forum contributions about this model: Racal Engineering /: ISB Adaptor RA-98

Threads: 1 | Posts: 1

Variants of the RA-98 SSB Adaptor:
RA-98A: British type coaxial connectors, no internal crystal controlled 188 kHz oscillator,
       need external 118 kHz source for hich stability ECSS operation.
RA-98B: US typ coaxial connectors and Monitor jack socket, no internal crystal controlled 188 kHz         oscillator
RA-98C: broadcast version of R-98B
RA-98D: with internyl crystal controlled 118 kHc oscillator with crystal oven
       switched by AGC - control knob.
RA-98E: with transistorized coupling circuit for use with transistorized receivers as RA-217 and             RA-1217
RA-98F: RA-98A modified for use with RA-317.

Martin Bösch, 02.Oct.06

Weitere Posts (1) zu diesem Thema.