Wide Band Decode Capabilities for CW Skimmer with RX2
Content provided by: Ed, W2RF / FlexRadio Systems
Many CW Skimmer users have asked for a way to expand the decode bandwidth beyond 24khz with a FLEX-5000. This is possible if you have a FLEX-5000 RX2 (second receiver). Assuming you already have CW Skimmer set up to work with the FLEX-5000 and PowerSDR using the Direct I/Q feature, here is the procedure for configuring wide band decoding for CW Skimmer on 20m:
In this configuration, the frequency of RX2 is fixed at 14.056.000. Changing it requires you to manually change the CW Skimmer LO frequency.
Procedure
PowerSDR Configuration
CW Skimmer Configuration
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| System Dependencies | |
| Minimum PowerSDR Version: | 1.18.3 |
| Applicable Hardware: | FLEX-5000 |
Content provided by: Ed, W2RF / FlexRadio Systems
Many CW Skimmer users have asked for a way to expand the decode bandwidth beyond 24khz with a FLEX-5000. This is possible if you have a FLEX-5000 RX2 (second receiver). Assuming you already have CW Skimmer set up to work with the FLEX-5000 and PowerSDR using the Direct I/Q feature, here is the procedure for configuring wide band decoding for CW Skimmer on 20m:
In this configuration, the frequency of RX2 is fixed at 14.056.000. Changing it requires you to manually change the CW Skimmer LO frequency.
Procedure
PowerSDR Configuration
- Use PowerSDR 1.18.3 and above
- On the Setup-Audio->VAC page select the option to use the RX2
- On the Setup->Audio page, set the sampling rate to 96 KHz and the buffer size to 1024 (for this example)
- Set the RX2 VFO frequency to 14.056.000 MHz
- Make sure SR (spur reduction) is off
CW Skimmer Configuration
- Set the Radio Type to SoftRock (NOT SoftRock-IF)
- Set the CW Pitch to 600 (or whatever you use for the PowerSDR Pitch Frequency)
- Set the LO Frequency to 14046400 (RX2 freq - 9khz IF freq - 600hz vfo pitch)
- Set the Sample Rate to 96khz
- Start PowerSDR then CW Skimmer
This KB article may reference additional files that are available on the FlexRadio Systems web site Downloads page. Please use the URL(s) below to download the referenced materials.
An Adobe Acrobat Reader may be required to open the file.You can download Adobe Acrobat from here.
KB Source Document(s):
None Referenced
