The new version 3.1.8 of vna/J is released.

The application JAR can be downloaded from here as usual. The following updates are included in this version:

  • Driver for metroVNA extended
  • Fixed display bug for metroVNA in calibration load/save dialogs
  • Upgraded to jna-4.2.1.jar
  • Upgraded to purejavacomm-0.0.28.jar
  • miniVNA driver optimized for new serial library
  • miniVNA pro driver optimized for new serial library
  • miniVNA Tiny driver renamed to match physical device
  • miniVNA Tiny driver various bug fixes
  • miniVNA Tiny driver optimized for new serial library
  • Cable length measurement should now work for miniVNA again
  • Cable loss dialog extended
  • Number of over samples is now stored inside calibration block
  • Bugs fixed for metroVNA driver

Three users reported strange problems on their Windows machines. They have exception on the Windows command line like "java.long.Error" which leads to the problem, that no longer any serial ports are displayed in the "Analyzer setup" dialog.

The following bugs are in release 3.1.8 of vna/J.

  • In the data analysis dialog you can open two Smith-charts. When you move the cursor in one Smith-chart and then switch the focus to the other Smith-chart, the cursor is moved back to the starting frequency in both charts.s
  • Auto-scale checkbox is not stored to and restored from a preset file
  • There may be something wrong with the GD scale - has to be verified

"I spend a lot of time tuning filters so that the GD measurement option in V3.1.4 has been quite valuable - prior to this I had to export to Excel and calculate therein. I had updated the GUI to V3.1.5 about a month ago and found that the GD scaling has become unusable with the plot producing negative values and the auto/manual scaling just ramping to some impossible limit which you cannot alter to usable values. I reverted to V3.1.4 so as to enable the correct and very useable scaling.

Can you please confirm these last 2 updates have the observed GD error and perhaps enable a fix - I use XP Pro although I don't believe that this has anything to do with it.

Additionally, is there any reason why the GD function is not enabled on reflection (S11) data? You've probably no apparent reason for doing this (I suspect that a variation of this is used for cable length testing) but in fact it is a very useful parameter in passive filter work. Could this be enabled as it is the same calculation a the transmission (S21) data just a different data set?
"

These bugs will be fixed in the near future.

Windows XP is now retired and no longer supported by Microsoft.

But you can still run vna/J on an PC running Windows XP if you follow these instructions:

I do not recommend running PCs on Windows XP as there will be no longer security updates for the operating system.

Also I do not recommend to user older JAVA versions, as Oracle may no longer release security updates for these runtime environments.

If you encounter problems running vna/J, feel free to contact me.

Here is wish-/feature -list for the upcoming version of vna/J:

  • Measuring the transfer impedance
  • Settings are saved at program termination and reloaded at start-up (selected scales, scan-range, ...)
  • S-parameter - Beside the regular db/angle format mag/angle is supported
  • TDR analysis
  • Cursor-frequency can be entered in the marker frequency field
  • When manually changing the frequency span, the marker frequencies should be retained if possible
  • Markers on the exported images can also print as vertical lines
  • Check on each window displayed, that it is in the visible area a screen (multi-screen problems)
  • Reflection group-delay requirement (S11, gd)
  • The selected frequency should be retained even when the Smith-Chart window looses focus
  • Identical file format (PNG) for all graphic exports
  • Colors for graphic export should be customizable
  • Table data in the cable lass dialog can be exported into XLS- or simple text format
  • Calculated values in the cable length dialog can be copied to the clipboard

You can contact me by email icon

You can buy the author a beer to support the further development of vna/J. You can do this via a PayPal donation. Many thanks in advance for this donation!

Betrag : 

2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.

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