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SuperBroom Plus TA
Non-Linear Junction Detector · NLJD - under construction

SuperBroom is a Non-Linear Junction Detector (NLJD), or Harmonic Radar, introduced in 1996 by Audiotel in Corby (UK), as the successor to the Broom ECM. Unlike its predecessor, which can only receive the 2nd harmonic, SuperBroom can detect the 2nd and the 3rd harmonic simultaneously.

This has the advantage over the original Broom, that it is easier to detect the difference between a semiconductor junction (which predominantly produces a 2nd harmonic) and a regular non-linear junction between metal objects (which generally produces a stronger 3rd harmonic).

In other words: by looking at the ratio between the reflected 2nd and 3rd harmonic, one can tell the difference between a bug and, say, a rusty nail. In addition, the Type Approved (TA) variant, uses frequency hopping over the 10 optimum channels, 1 to avoid false-positive triggering.
  
SuperBroom

Furthermore, the output of the transmitter can be selected between 6 µW and 2 W. 2 The image above shows a typical SuperBroom kit, that was used by a European agency for many years. The device consists of a main unit, with a rectangular antenna — attached to a telescopic stick — connected via a fixed black cable. When operated, a display on the antenna shows the currently selected power output, whilst a LED bar mimics the signal strength display of the main unit.

  1. In Europe, 19 channels have been allocated in the 869.400 to 869.650 MHz band. On startup, SuperBroom selects the optimum 10 channels, that have the least interfering signals. This improves detection and greatly reduces false-positive triggering. The channels are listed in the manual [A].
  2. Approved levels in Europe are 20 mW (EU Low) and 500 mW (EU High).

SuperBroom Main unit Antenna Telescopic arm Display and LED bar
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SuperBroom
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Main unit
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Antenna
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Telescopic arm
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Display and LED bar

Versions
  • SuperBroom ECM
  • SuperBroom Plus
  • SuperBroom Plus TA
Parts
Transport and storage case SuperBroom main unit (transceiver) SuperBroom antenna (fixed to main unit) Headphones AC adapter
AC
Test target Operating instructions
Carrying case
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Inside the case

Main unit
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Main unit

Antenna
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Antenna

Headphones
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Headphones

AC adapter
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Mains charger

Target
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Test target (puck)

Operating instructions
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 Download manual
  
Manual

Storage and transport case Inside the case Antenna stowed in the storage case Main unit Antenna Headphones Mains charger Test target
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Storage and transport case
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Inside the case
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Antenna stowed in the storage case
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Main unit
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Antenna
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Headphones
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Mains charger
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Test target

Documentation
  1. SuperBroom Plus TA, Operating manual
    2-197-869. Audiotel, November 2001, issue 1.2.
Further information
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Crypto Museum. Created: Wednesday 25 September 2019. Last changed: Wednesday, 25 September 2019 - 20:54 CET.
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