I just have tested my setup of Pluto with Leo Bodnar GPSDO and everything is working fine now and I had some nice contacts via QO-100.
The shift I was talking about was a shift between Rx and Tx in SDR-Console when both windows were synchronized and show the downlink frequency. Before I changed the setting for reference correction the CW-beacon was at 10.489,495 MHz and rx and tx frequency were not tranceive. My signals were approx. 11 kHz beside expected downlink frequency.
Now beacon is at 10.489,500 MHz and Tx and Rx are working transceive.
Thus, my conclusion is:
- There was a correction set for external reference in my Pluto.
- "fw_setenv xo_correction 40000000" changes it to 40 MHz
- everything is perfect now.
Thanks again Detlev and Adrian you have been of great help in this matter.