• Country
• Great Britain (UK)

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

• Year
• 1977–1982 ?

• Category
• Commercial Transmitter & Receiver (TRX not Amateur)

• Radiomuseum.org ID
• 203854

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Superhet with RF-stage; ZF/IF 1600 kHz; none

• Wave bands
• Broadcast, Long Wave and more than two Short Wave bands.

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 24 Volt

• Loudspeaker
• - only for Earphone!

• Material
• Bakelite or Plastics (type unknown)

• from Radiomuseum.org
• Model: Syncal 30 TRA931 [Grinel TR48, TRA931X, TRA931Y] - Racal Engineering /

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 366 x 275 x 116 mm / 14.4 x 10.8 x 4.6 inch

• Notes
• Grinel Electronics in South Africa was formerly Racal (Also known as GRC and Milcom). Their version called TR48 but still with Racal "Syncal 30" logo at knobs included all the Racal versions. In addition they supplied version with an extra toggle switch and a similar RCA CDP1802 mpu based card for "Frequency hopping" encryption (early Spread Spectrum) as used in the TR16. The hopping code is set by using the frequency decade knobs and then using the toggle switch. While there are technically 1 kHz channels from 1.6MHZ to 29.999MHZ, the "Search" knob allows more than +/- 1kHz variation. Reception is possible from 100kHz upward. Only Transmission is limited to 1.6MHz and above. Modes are AM, USB and LSB on receive and Transmit, with USB or LSB can be used with a key for morse code (CW). The Whip tuner (6' to 11' whip or other aerials, normal is 8') is integral and the TX power meter has a left and right pair of LEDs to show the operator which direction to wind the tuning coil. The Tuning unit is a 7cm insulated drum (approx) beside a metal spindle. Gold plated wire braided on cord is wound on/off the Drum from/to the spindle to vary inductance in series with with the aerial whip. Transmit power is about 5W on AM and 22W on CW or SSB peak 74 series logic for synthesiser. All RF, IF and AF is transistors. Some 723 IC regulators. Extensively used by Iraqi in 1st Gulf War.

• Net weight (2.2 lb = 1 kg)
• 11 kg / 24 lb 3.7 oz (24.229 lb)

• Price in first year of sale
• 12,000.00 $

• Author
• Model page created by Michael Watterson. 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