PC is a Dell Studio 1749  running WSPR 2.12.

It does have a tendency to fight with our cheap home broadband router supplied by British Telecom, resulting in the "Orange Light of Death" and subsequent grief from XYL and 2 teenagers as their Netflix/Music stream/Online gaming has just fallen over!    Ferrite toroids have been spectacularly unsuccessful in remedying this.  The best solution has been to try to run the CAT5 cables in my office as perpendicular to the coax feed and line of roof top wire as possible to minimise pick up and cross talk, but this hasn't really been that effective either.

 

A bigger issue on Rx is the noise  pick up from both Dell (genuine kit and  not cheap copies either, which is annoying!) PSUs that feed the Studio and the XPS17 which is my main office PC. On batteries, I get about S1-3 of noise which is very good, but as soon as the PSU's are used and are under "load" then this rockets up to S7-9!  If they are powered on, but not driving the laptops i.e. disconnected, then they have no impact.    I'm wondering if it is the load that makes them noisier or whether the whole laptop acts as an augmented antenna when they are connected to it?

I've tried putting them in shielded earthed metal boxes (biscuit tins!) with no effect. (biscuits were nice though!).  Similarly, stacked ferrite toroids on the mains inputs and DC power out have had zero impact.  They both have a very bright blue LED on the power cable whereas older units for my Dell D610/20 series did not have this "bauble" and were much quieter, but also were lower rated at 60W or 90W as opposed to these beasts which are around 120W to 150W, and run alarmingly warm at times!