@DD5ER: thank you
then it seems that my RX stability here is not to bad. But i'm still not happy about the SDR-Stick...
My OCXO for the LNB is powered 24/7 but the RTL-Stick cools down when no SDR SW is running.
Every time i power up the PC (and then the SDR-Stick) it takes about 15-20 (30 measured) mins till the drift of the Stick is negligible.
A direct supply with 5V on the SDR-Stick does not help because the stick warms only up when accessed via SW.
Has anyone tried to lock the RTL-SDR to a more stable reference than the internal 0,5ppm TCXO with 28,8MHz.
Could a 27MHz OCXO (i have some of those here) work? Or is that to far away from the 28,8MHz?
73s DB8TF