WavViewDX User Manual

WavViewDX - Advanced Analysis Options


Overview:

The advanced analysis options can be reached via the "More" button of the main menu:




Available features (click on Link for details):
- Manual Tuning
- Contrast Settings
- SDR Sampling Rate Offset Compensation
- Generate SDR Sampling Rate Offset Analysis
- Generate Noise Map
- Show Current Recording in Explorer
- Save Analysis as Image

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Manual Tuning

Allows you to tune into frequencies, that are not part of the analysis.
Use it e.g. to check your reference carriers. If SDR clock offset compensation with reference carriers was enabled during import, pre-set buttons are provided with the reference carrier frequencies.
Use the slider to set the playback time. To jump to another time during manual playback, use keyboard shortcuts.



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Contrast Settings

Change the contrast settings (minimum visible, highlight, maximum) of the current analysis.



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SDR Sampling Rate Offset Compensation

Switch between the available compensation options.
No Compensation: Frequencies are shown as recorded by the SDR.
Use Import Compensation: Frequencies are compensated using the measurements done during import.
WavViewDX built-in passive compensation: A measurement relying on a band full of European stations. Accuracy usually < 1Hz.
Manual compensation: Be your own boss and enter the true offset values. The Absolute offset is measured from minimum frequency of the recording.




The value of the Import Compensation depends on the current player time. If the import compensation did not work partially.e.g. because the reference broadcase station became too weak after sunrise, you can still get good measurements this way:
- Start playback at a time at which the import compensation was correct and stable (use the S
DR Sampling Rate Offset Analysis as described below).
- Open this window again
- Make sure "Import Compensation" is selected
- Click on the "Freeze" button. The current offsets are copied to the manual compensation setting).


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Generate SDR Sampling Rate Offset Analysis

Generates a image with all information about the SDR sampling rate offset.
Use to find out of your SDR sampling rate offset compensation is set up correct and working properly.

Below example shows a recording of a PERSEUS SDR with good SNR on both reference carriers.
The carrier frequency detection works stable: no/very weak jitter in of the offset measurements.
The carrier SNR is fair, with > 20dB SNR in the detection window.
The only problem in this analysis is the fast drift at the beginning, which means the SDR needs more warm-up time. 1.5~2 hours warm-up tim recommended.




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Generate Noise Map

Generates an image showing the noise level for each analysis channel. Example (of one of my bad days):


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Show Current Recording in Explorer

Opens a file browser, with the currently played SDR recording selected.
Linux:
Opens a file browser, which shows the folder containing the currently played SDR recording.


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Save Analysis as Image

Saves a picture of the currently shown analysis. Not implemented yet.

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WavViewDX by Reinhard Weiß
2025-01-24
http://www.rweiss.de/dxer/tools.html
dxer@rweiss.de



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