Spy Radio Set Type A Mk. III (A3)

• Country
• Great Britain (UK)

• Manufacturer / Brand
• Marconi Co. (Marconiphone, Marconi's Wireless Telegraph Co. Ltd.), GB (not tubes - see also HMV His Master's Voice)

• Year
• 1944

• Category
• Military Transceiver (TRX)

• Radiomuseum.org ID
• 299645

• Picture
• Schematics

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

• Number of Tubes
• 5

• Valves / Tubes
• 7Q7 7H7 7H7 7H7 7C5

• Main principle
• Transceiver

• Wave bands
• Short Wave (SW only)

• Power type and voltage
• Line / Storage batteries (perhaps also batteries) / 100-130AC or 200-250AC or 6DC Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Spy Radio Set Type A Mk. III - Marconi Co. Marconiphone,

• Shape
• Miscellaneous shapes - described under notes.

• Notes

• This transceiver radio used by Special Operations Executive (SOE) and was conceived in 1944. It was the smallest transceiver used during World War II and was completely miniaturized, except for the "lock-in" American tubes.

  SOE-Designator: Type 21 Mk.III.

  Power output: 5 watts.
  overage 3.2 to 5.25 mHz, "Blue" band, 5.2 to 9.55 mHz, "Red" band.
  ore than 4000 were made by Marconi. It was designed as a replacement for the bulky Type 3 Mk.II (B2) suitcase radio. It was the smallest transceiver made during WW2 and was favoured by resistance groups and Special Forces operating behind enemy lines.

  It was available in two versions;
  1. A container version comprising two watertight metal containers allowing it to be dropped by parachute to resistance groups. The larger container, marked 'C, held the transceiver, whilst the smaller one, marked 'D', contained the SPARES-box and a vibrator pack for 6V operation.
  2. Small suitcase containing the transceiver and SPARES box

  Measurements & weight: 

  "C" measures 27 x 23 x 11 cm and weighs 5.5 kg.

  "D" measures 17.5 x 13 x 22 cm and weighs 4.5 kg.

• Net weight (2.2 lb = 1 kg)
• 10 kg / 22 lb 0.4 oz (22.026 lb)

• Mentioned in
• -- Collector info (Sammler) (RAM Magazine 125. October 1991, page 20)

• Literature/Schematics (1)
• RAM Magazine 125. October 1991, page 25

• Author
• Model page created by Gary Cowans. See "Data change" for further contributors.

• Other Models

• Here you find 500 models, 334 with images and 316 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Marconi Co. (Marconiphone, Marconi's Wireless Telegraph Co. Ltd.), GB (not tubes - see also HMV His Master's Voice)