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
- 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.
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;
- 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
- RF Space SDR-IQ and SDR-14;
- SRL QuickSilver (QS1R).
- HPSDR Mercury,
- Microtelecom Perseus.
CW Skimmer can be used with the SDR-1000 and
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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