Powerful, but still compact and portable, Magritek’s new generation of Kea NMR spectrometer, the Kea2,  significantly improves performance and extends the frequency range of our signature NMR spectrometer line.

With a footprint of 36 cm x 23 cm (12″ x 8″) by only 15 cm (5″) high, the Kea2 conserves lab space. Weighing less than 5 kg (11 lbs), it is easily moved and operated in almost any environment.


The Kea2 spectrometer is modular to meet your requirements. Existing systems are easily integrated with Kea2’s optional internal RF amplifier, preamp and duplexer modules. Kea2’s imaging module provides control of up to 4 gradients.

Direct digital transmit and detect

Kea2 uses no intermediate mixing frequencies — meaning no quadrature issues. Kea2’s  digital transmit circuit performs direct waveform synthesis. The receive module directly digitises the NMR signal at 100 MHz for a high quality, low noise NMR signal. This is the same technology used in most modern high field NMR spectrometers but is available with Kea for a fraction of the price.


The lightweight, low-footprint Kea2 spectrometer is convenient to use in almost any environment. Powered by two standard 12 V car batteries, the Kea2 can be operated far afield in any remote location.

Main Features 1 to 100 MHz

  • A modular design, with several optional modules such as an internal amplifier and a four channel gradient driver module
  • Optional second channel
  • High stability oven controlled oscillator
  • Available as a standalone or OEM product
  • Experiment design and data processing can be combined into a single button click with the included Prospa programmable macro language and programming environment
  • Small and lightweight: perfect for portable applications, or where laboratory space is at a premium


The extended operating range and features of the Kea2 series makes it useful for a wide range of applications:

  • Spectroscopy, time domain relaxation and imaging
  • Mobile permanent magnets
  • Single-sided NMR

Key features

The new Kea2 series NMR spectrometer is ideal for a broad range of NMR systems; from very low field permanent magnet systems to high frequency superconducting systems.

With a footprint of 36 cm x 23 cm (12″ x 8″) by only 15 cm (5″) high, the Kea2 conserves lab space. Weighing less than 5 kg (11 lbs), it is easily moved and operated in almost any environment.

Pulse Programming

Users can create their own pulse sequences with Prospa’s straightforward, Matlab-like language.

High Stability Oscillator (Optional)

The Kea2 has an optional oven-controlled oscillator to ensure a frequency stability of better than 1 ppb/ºC. This high stability is often needed for high frequency operation on superconducting magnets.

Four Channel Gradient Driver Module (Optional)

Together with the Kea2 and the standard Prospa software package, the gradient driver module makes for a complete and powerful MRI imaging system.

Second Transmit Channel (Optional)

An optional second transmit channel allows synchronized cross-polarization experiments and measurements. Note that there is only a single receive channel.

Optional second transmit channel
An example of some gradients written in Prospa and measured on the output of the gradient module.


System Core / DSP Control Module:

  • Interface: Full speed USB 2.0
  • Pulse program timing resolution: 100 ns
  • Waveform memory: 256 k (128 k waveform, 128 k data) 24-bit samples.
  • User interface: Prospa software
  • I/O: 8 TTL outputs, 1 TTL input

Digital Receiver:

  • Input impedance: 50 Ω
  • Sample rate: 100 MHz
  • Resolution: 16-bit
  • Input bandwidth: 50 MHz
  • Digital filtering: programmable.

Digital Transmitter:

  • DDS output level: 0 dBm
  • Transmitter output power: 1 mW
  • Output impedance: 50 Ω
  • Clock rate: 1 GHz
  • Frequency stability: 1 ppm/C standard, or <1 ppb/C with optional oven controlled oscillator
  • Modulation capabilities: frequency, phase and amplitude modulation.
  • Maximum update rate: 2 MHz

Receiver Amplifier:

  • Operating range: 1 to 100 MHz
  • Gain: -20 to +70 dB, digitally controlled in 3 dB steps (0 to 60 dB for low frequency Kea).
  • Input/output impedance: 50 Ω
  • Analog filter: 50 MHz blocks

Preamp Duplexer (Optional):

  • Preamplifier gain: 37 dB
  • Preamplifier noise figure: < 1.5 dB
  • Dead time < 10 microseconds

Transmitter Amplifier (Optional):

  • Transmitter output power: 100 W to 50 MHz, 30 W to 100 MHz

Imaging Module (Optional):

  • Number of channels: 4
  • Maximum output voltage: +/- 10 V
  • Digital resolution: 16 bits

Power Supply:

  • Voltage: 24 V DC
  • Current: 2.5 A DC


  • Size: 360 x 230 x 150 mm
  • Weight: 5 kg (11 lb)

Download the KEA Brochure