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Audiotel VTX/VRX
Covert transmitter and receiver

VTX/VRX was a body-wearable covert transmitter/receiver system, developed in the mid-1980s by Audiotel International Ltd. in Corby (UK). The system worked in the VHF band around 150 MHz and consisted of a separate transmitter (VTX-22) and receiver (VRX-SL). The system – which was not listed in Audiotel's catalogue – was only sold to law enforcement and intelligence agencies.

The unit on the left is the VRX-SL receiver. The one on the right is the VTX-22 transmitter. Each unit has its own battery and a piece of wire that is used as the antenna. A variety of different types of microphone was available for the transmitter, ranging from a small concealed one, to microphones with a separate push-to-talk (PTT) switch.   
VRX-SL receiver (left) and VTX-22 transmitter (right)

VRX-SL receiver (left) and VTX-22 transmitter (right)
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VRX-SL receiver (left) and VTX-22 transmitter (right)

Documentation
  1. VTX Sales brochure
    Audiotel Ltd., 1989.

  2. VRX-SL sales brochure
    Audiotel Ptd., 1989.

  3. VTX VRX Operators Manual
    Audiotel Ltd., January 1985.
Further information
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Crypto Museum. Last changed: Sunday, 17 February 2019 - 15:37 CET.
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