"Owen Duffy" wrote in message
...
On Thu, 26 Oct 2006 14:06:53 GMT, "John, N9JG"
wrote:

When I operate on 75 meter SSB with my transceiver, my computer beeps and
disconnects/reconnects my USB connected keyboard. Note that I do not have
this problem on 40 meter SSB. My computer is located on the second floor
of
a brick house, and one end of my dipole is about 15 feet from my shack.

From comments made by others, I may have to put RF filters on the cables
and wires connected to my computer. I am contemplating the use of
Amidon FT-240-77 ferrite toroids, which have an I.D. of 1.4 inches and
cost $9 each. If I buy in quantities of 10, is there a cheaper source
for this toroid?

Any comments or suggestions on this problem would be appreciated.

Just one other thing to be aware of, with the dipole being nearby. Things
other than the computer can be affected. I had an dipole that coupled into
the central air/heat control box, because the control wires ran in the attic
parallel to, and about 15 feet from the dipole. With 100 watts, I managed
to burn out the control box solid state stuff. I didn't look to see what
the control wire resonance might be, but a snap on toroid was used to solve
the problem with the new control box.

--W