[LAU] RF noise suppression?

I'm using a FOcusrite Saffire pro 26 I/O with ffado, jack, and Ardour to
make multitrack recordings of live concerts, to my emachines M6810 laptop
running ubuntustudio. I'm plagued by noise that sounds to me like RF
interference from the laptop, getting into the audio portions of the
interface. It's most obvious when I'm at home trying to mix down my
recordings, as its almost constant in my monitors and most noticable in
a quiet room, but it also manifests itself sometimes during shows, showing
up on the input lines to the interface, which are plugged 'half-way' into
the FOH mixer's channel inserts, so it invades the PA and the performers'
monitors. WHen that happens, I've no other choice but to abandon the
recording and shut down the laptop.

   Has anyone else encountered this problem? Got any suggestions how to
filter it? I'm going to try some ferrite cores snapped around the
firewire cable first. Anything else I might try?

-- 
Rick Green
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
                                   -Benjamin Franklin
"As for our common defense, we reject as false the choice between our
safety and our ideals."
                                -President Barack Obama 20 Jan 2009
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