Afreet Software, Inc.
     Software created by Alex Shovkoplyas, VE3NEA


RTTY Skimmer Server


DX Atlas

CW Skimmer

CW Skimmer Server

Pileup Runner

DX Bulletin Reader

Voice Shaper


Band Master


Morse Runner



Morse Midi


Tech stuff



QRQ Profiler


SSTV Tools


CW Skimmer 1.83

Multi-channel CW decoder and analyzer

for Windows 98/ME/2000/XP/7


  • a high sensitivity CW decoding algorithm based on the methods of Bayesian statistics;

  • simultaneous decoding of ALL cw signals in the receiver passband - up to 700 signals can be decoded in parallel on a 3-GHz P4 if a wideband receiver is used;

  • a fast waterfall display, with a resolution sufficient for reading Morse Code dots and dashes visually;

  • the callsigns are extracted from the decoded messages, and the traces on the waterfall are labeled with stations' callsigns;

  • the extracted callsigns are exported as DX cluster spots via the built-in Telnet cluster server;

  • a DSP processor with a noise blanker, AGC, and a sharp, variable-bandwidth CW filter;

  • an I/Q Recorder and player.

Contest, 3-kHz mode

Note that only 3 kHz of spectrum can be decoded and viewed on the waterfall display if a 3-kHz radio is used, as shown on the screenshot above. Wideband display and decoding shown below requires a wideband SDR receiver such as SoftRock.

Contest, wideband mode

Pileup, wideband mode


Pete N4ZR has written an excellent tutorial for those who are making their first steps with CW Skimmer. Read his tutorial online here.

System Requirements

  • Operating system: Windows ME, Windows 2000, Windows XP, or Windows 7 (32-bit or 64-bit). The program may or may not work on Windows 98 SE and Vista, depending on the quality of your audio drivers. Windows 95 and Windows 98 GE are not supported.

  • CPU: Pentium-4 2.5 GHz with a wideband radio, or 1 GHz with a 3-kHz radio;

  • Ports: one COM port for the radio CAT control;

  • Receiver:
    • 3-kHz receiver - an ordinary transceiver or receiver, with 3-KHz audio output;
    • SoftRock receiver - a wideband receiver with quadrature output and fixed center frequency;
    • SoftRock on IF - a combination of an ordinary receiver and a SoftRock working on receiver's IF;
    • RF Space SDR-IQ and SDR-14;
    • SRL QuickSilver (QS1R).
    • HPSDR Mercury,
    • Microtelecom Perseus.

    CW Skimmer can be used with the SDR-1000 and Flex-5000 radios via a virtual audio cable.

  • Sound card: a stereo sound card that supports the 48 kHz sampling rate or higher and has a valid WDM driver;

  • Cables: two cables are required for connecting the radio to the PC: a standard stereo cable for the audio or I/Q signal, and a CAT cable/adapter for the CAT control.

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