[Ham-Mac] ethernet hash

[EZ Rhino]

Guys-

Wondering if any of you have dealt with ethernet noise showing up all over the RF spectrum for your iMacs?  I recently got fast(er) internet at home and now I get a very loud spike (sounds like a CW carrier) every 50khz or so from 20m to 2m.  It's aweful.    Specifically, the internet is from an access point to my home via a dish on the roof, then cat 5 from the dish to my 24" iMac.  

Today I tried cabling the internet/cat 5 to an Apple Airport Extreme wireless router, and then let my iMac pick up the signal wirelessly.  It didn't kill the noise.  I even replaced the cat 5 they installed with shielded cable to no avail.  Wrapping the cat 5 around toroids begins to reduce the RFI a bit.

If I connect two computers--Apple or PC--together with cat 5 in the shack, I get the noise.  If I connect two computers together on the opposite side of the house I can't hear the noise in the shack.  So it seems to be a proximity thing.

At this point I'm facing moving the dish to the opposite end of the house which I don't want to do, thought I'd see if anyone here has similar problems.  There are several posts on QRZ.com/eHam.net forums with similar complaints.

Chris
KF7P