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Compact In-Line
Compact In-Line mono/stereo DSP noise cancelling module

Net Price (ex VAT) £ 149.96
Compact In-Line
0.270 kg





Part of a Bundle


Improve your listening experience with the bhi Compact In-Line module!

Compact portable DSP noise cancelling in-line module
The bhi Compact In-Line module measures just 125 x 70 x 37 mm is ideal for base station or portable use.  The unit includes the latest bhi DSP noise cancelling technology and is suitable for use on all radios and receivers and software defined radios (SDR), which includes Elecraft and FlexRadio products.

Compact In-Line connections
The Compact In-Line module can be powered from a 12V DC power supply or by two AA alkaline or NiMH batteries.  Input connections are made via the separate 3.5mm speaker level and line level audio input sockets.  The output socket can drive a pair of stereo headphones, a mono loudspeaker or a pair of powered stereo speakers.  

Simple operation
All the Compact In-Line functions are controlled via the two rotary pushbutton controls on the unit.  They are easily adjusted to suit your current noisy conditions. The “Power/Volume” control switches the unit on and off and adjusts the audio volume.  The “Filter Level” control allows to adjust the filter level in real time and turn the filter on and off.  You can also select between mono and stereo mode with the two rotary controls.  


  • Compact handheld DSP noise cancelling module
  • Latest bhi DSP noise cancelling technology
  • Processed speech clearer and more intelligible
  • Easy to use controls for all functions
  • Use with mono, stereo or two separate audio channel inputs
  • Ideal for portable use, DXing, and special event stations
  • Use with headphones,a passive speaker or powered speakers
  • Over 40 hours battery life with 2 x AA alkaline or AA NiMH batteries


Power Supply:
External supply: 8 to 16V (nominally 30mA, max 350mA peak)
Reverse polarity protected
Internal batteries: Type: AA x 2 (Alkaline or NiMh recommended)
Reverse polarity protected
Low battery indication threshold: 2.1V ±0.1V
Low battery indication: LED colour changes to red.
End-of-life threshold: <1.5V
Life: 40 hours typical (Alkaline or 2500mAH NiMh).
Auto power-off: 60 minutes if input signal < 60mVpk-pk
Auto power-off can be disabled if desired.

Audio Inputs
Speaker level in: Stereo or Mono
Input Impedance: ~7 Ohms
Max withstand input power: 2 Watts RMS per channel
Max input amplitude: 3.9Vpk-pk
Line level in: Stereo of Mono
Impedance: 6.7k Ohms typical
Max input amplitude: 1.6Vpk-pk
Overload indication: LED flashes for at least 3 seconds

Audio Outputs
Phones out: Stereo or Mono
Impedance: > 4 Ohms (Can also be used as Line Level output).
Max power output: 0.2 Watts RMS per channel
Volume levels: 16 levels in 3dB steps.

DSP Noise Filtering
Modes: Enabled / Disabled (0dB suppression)
Levels: 8
Noise suppression: 8 to 40dB

Size & weight
Size 125 x 70 x 37mm
Unit weight 0.125Kg                                  


"The noise elimination achieved was very worthwhile and the unit was easy to use. As its name suggests the Compact In-Line is very compact and the integrated battery power facility makes it ideal for use on holiday or for a spot of hilltop listening"
Mike Richards G4WNC - Radio User magazine

"I thought you might enjoy seeing your Compact In-Line installed in my K3 and KX3 Station.  It is sitting on top of a small audio amplifier (to the right of the KX3) which powers the two speakers.  It works GREAT!  (Possibly even better than your mono units.)  Makes the general radio and atmospheric noise level drop away which, in turn, makes listening so much more enjoyable.  Any SWL listener would be thrilled with the improvement, as well."

“I had never tried “stereo” audio from my rigs until getting the Compact In-Line. There is a significant increase in listening enjoyment by using stereo audio. The Compact In-Line greatly reduces the audio “hiss” and makes the audio generally quieter and much easier to listen to.”

“The setup of the Compact In-Line is very intuitive, albeit after a brief reading of the information sheet. All changes in volume and processing are indicated audibly by means of beep tones. Changes in the processing level show as variations in audio beep frequency, e.g. increases in processor levels are conveyed by increases in the frequency of the tone produced. Very easy to follow.” James Robbins N1JR

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