I have a few queries regarding people's experience with Ferrite, esp.
beads and so forth.

Can these things actually reduce noise?

I once had HUGE computer noise in my ham shack. My
computer made so much hash that there were only tiny
segments in each band where the noise was outside the
passband of my filters, and I could work weak signal CW.

Then someone told me to put ferrite on all the computer
wires. I bought some surplus (Mitel was the brand, from
I believe All Electronics or some such) snap-on ferrite
gizmos. I put one on the monitor cable - Hmmmmm....
lesss noise. So I put one on the mouse cable, the keyboard
cable, the speaker wires, etc. The more I put them on
the wires the quieter things got. Then I added one on
EACH END of each wire - it's now virtually silent in
my ham shack from that computer.

So in my case? Yeah - they made a HUGE difference.

Dave