Tnx Mitch,
What I did with my remote SDR is placing it out of the house QRM field,feed it only with linear PSU's, making a wifi link to the house and push it over ADSL from there. This makes a very clean setup without much noise and carriers on HF.
If I put the RRC over there with a CAT5 extension line, the amount of QRM (noise, warbles, carriers) is significantly higher, clearly visible on the SDR.
I'll experiment with some different shielded cables and chokes to see how much I can clean up. What I also do is remotely switch of the RRC if I am using the remote SDR.
But a 100 % clean HF may be an ilusion... :-)
Using the RRCs is already a 100 times better than my local QRM.
73
Paul
PD0PSB