i highly recommend them, my computer was just killing my radios with rfi i
put three ferrite beads on my cable modem line and that reduced the
interference by 75%. three on the cable to my monitor and that dropped
interference another 10%.i also put some ferrites on the power cables going
to my radios, not sure if it helped much but it didn't hurt!!!!
another thing i did was use some really well shielded co-ax, i was using
cable t.v. co-ax and the shielding was not good at all. with just the cable
t.v. co-ax and no antenna hooked to the co-ax i was getting readings as
high as s-8........with well shielded co-ax the readings were down to s-0 to
s-1.

i also made a co-ax choke, it is just a matter of taking your co-ax and
making about 8 or 10 small loops (6 to 7 inches in diameter) and just tie
strap them together to form the choke. go to this website and it will tell
all the details for the co-ax choke
http://www.radiohc.org/Distributions/Dxers/coax-rf.html

good luck and let us know what happens and what works for you

chuck


"Robert11" wrote in message
...
Hello:

Regarding those ferrite (presumably) toroidal cores that are available to
clamp over
AC line cords, etc. that are sold as being helpful to reduce interference.

Do they work ? Worth doing ?

Any potential problems with using in the wrong place ?

Where would one use them, and more importantly, not use them ?

R/S ones any good ?

Thanks,
Bob