FFTDSP - See weak signals with your PC and Sound Card !!

       FFTDSP is a PC program which can detect weak radio signals in real time.  

             - Uses the PC's soundcard and advanced signal processing techniques.

             - Extracts and displays weak signals from the receiver audio.

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The example output screen shows a typical two minute period of moon bounce (EME) operation.  Near the top are four "echo" test transmissions.  The transmit signal is shown just above 500 Hz and the receive echos at 780 Hz.  The first echo was the strongest at just under 20 dB S/N.  Starting at 2356z, IK5DCX is shown calling CQ at 700 Hz with a fairly good signal (approx 10 dB S/N).


FFTDSP Demo Version 42y now available:

NEW fftsp42y.zip (410 K Bytes)

If using the "FIND" mode, here is the latest eme.ws file:

NEW emews.zip (12K Bytes)


Key Features of FFTDSP42 are:
  • Real Time Color Spectrum Graph with 2 Hz Filtering (4096 Point FFT)
  • Automatic Color Gradient for Optimum Visibility
  • Numerical Frequency display of Max Amplitude Signal (2 Hz resolution)
  • Record and Playback WAV files for post spectral analysis
  • Integration mode for signal detection below the noise
  • Mouse point and click for selective recording
  • On screen Moon Az/El, TOD & East/West sequences
  • True S/N (in 100 Hz ref) measurement & bar graph
  • Selective area and mode for S/N display
  • Display Smoothing Filters (Hamming, Cosine, etc.)
  • Zoom In/Out for narrow (1300 Hz) or wide (2500 Hz) display
  • Improved Graphics Interface and Setup Screens
  • Find Call feature shows most probable calls
  • Object tracking by RA/DEC
  • Data Logging for long term unattended monitoring (such as SETI)

System Requirements:

  • 386, 20 Mhz with Coprocessor
  • 486 recommended for future upgrades
  • Sound Card

      - Media Vision ProSpectrum-16
      - Thunder Card, Sound Blaster, Sound Blaster-Pro
      - Sound Blaster ASP-16, AWE32, AWE64


FFTDSP4x Program Distribution and Price:

FFTDSP42 Demo is distributed as a fully functional but time limited program.
Without the registration file, operation is time limited.

Program Cost:

  • This program is no longer being sold since it is not compatible with modern PCs

Examples of FFTDSP Applications

 Return to AF9Y WebPage on Moonbounce and Weak Signal Detection