Real-Time Channel Simulator DT4630 RTSIM

The real-time channel simulator for RF propagation channels allows for an economical and reliable way to test communication systems such as wireless modems in a laboratory environment. Our DT4630 RTSIM therefore reproduces all essential characteristics of the shortwave transmission channel, given by the ionosphere. The Watterson channel model according to ITU-R F.1487 serves as basis.

These simulations can evaluate transmit and receive characteristics of devices under controlled conditions. Thus, reproducible results are obtained without time-consuming field tests.


Stand-alone operation with touch-screen  

  • High-reliability hardware built for continuous operation
  • Full remote control via remote front panel GUI
  • Remote scripting capability for simulation setup automation
  • Easy software update of complete device via USB stick or CD
  • Channel simulation according to the Watterson model described in ITU-R F.1487
  • Direct conversion architecture with full HF band support (1 MHz to 30 MHz)
  • Simulation bandwidth of 1.6 MHz
  • Clock synchronization to external 10 MHz reference clock signal
  • Very little processing delay (below 50 μs)
Icon touch screen
Icon RF input and output

RF input and output

  • Analogue RF input (50 Ω), max. input level of +10 dBm
  • Direct sampling ADC with 100 MS/s
  • Analogue RF output (50 Ω), max. output level of -20 dBm
  • RF input and output range from 1 MHz to 30 MHz
  • Configurable output attenuation of up to 127 dB
  • Synchronization to external 10 MHz reference clock signal (e.g. GPS)

Real-time channel simulation

  • Simulation bandwidth of 1.6 MHz
  • Multipath simulation of up to four paths
  • All path individually configurable for paths delay, Doppler spread, Doppler shift and attenuation
  • Tapped delay line processing for delays up to 20 ms
  • Doppler spread configurable from 0 Hz to 75 Hz
  • Doppler shift configurable from 0 Hz to ±100 Hz
  • Relative path attenuation configurable from 0 dB to 20 dB
  • Signal output can be charged with white Gaussian noise (AWGN) from -160 dBm/Hz to -20 dBm/Hz
Icon real-time simulation
Icon control interfaces

Control interfaces

  • Front panel GUI with touch-screen and keypads for direct device configuration
  • Remote front panel GUI executable for Win32 (portable application: no installation required, for easy use it can be copied e.g. to a USB stick and run from there)
  • Compact web interface for remote control
  • Remote scripting capability for simulation setup automation

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