• Country
• Great Britain (UK)

• Manufacturer / Brand
• Racal Engineering / Instruments / Electronics Ltd., Bracknell

• Year
• 1965 ??

• Category
• Military Equipment (not Re, Tr or RXT)

• Radiomuseum.org ID
• 106384

• Main principle
• RF-Circuit or wave trap (separate, can also be an antenna with amp.)

• Wave bands
• Short Wave (SW only)

• 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: Pre-Selection & Protection Unit MA-197B - Racal Engineering /

• Shape
• Rack

• Dimensions (WHD)
• 483 x 178 x 480 mm / 19 x 7 x 18.9 inch

• Notes
• Preselector and Front End - Protector.
  For Preselection and Protection of receiver front-ends against HF up to 40V.
  Operational in Segments 2-4 / 4-8 / 8-16 / 16-24 MHz.
  Variants: MA-197A, MA-197B-1 (RAF contract), MA-197B-3 for Dutch Navy; MA-197C modified for use with RA-17/117 and RA-217/1217.

• Net weight (2.2 lb = 1 kg)
• 20.5 kg / 45 lb 2.5 oz (45.154 lb)

• Mentioned in
• Racal Handbook, Rinus Jansen

• Author
• Model page created by Martin Bösch. See "Data change" for further contributors.

• Other Models

• Here you find 113 models, 62 with images and 18 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Racal Engineering / Instruments / Electronics Ltd., Bracknell