Helllo Jean Luc,
If you have tried with OmniRig without success maybe this SDR is not supported. You should contact Alex, VE3NEA to check how you have to set up this SDR in OmniRig. You will have first to achieve to make it working with OmniRig. If it works well in OmniRig it will work well in Swisslog because Swisslog reads the info OmniRigs sends.
I suggest you to try DXLab Commander which supports the SDR6500. I will implement support to DX Lab Commander in the next version. But in current version you can use DX Lab Commander to read QRG/Mode. Please read this post where I explain how to configure DX Lab Commander in current Swisslog version:
http://www.swisslogforwindows.com/forum/...hp?tid=251
Best 73 and let me know the results!