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"scott" jsodellatgmail.com wrote in message
...
I got a response from a friend on the Bristol Channel Cutter list who uses
a DC to DC converter for his laptop. Sort of a Gordion Knot-cutting
solution - why try to fix an inherently noisy brick if a quieter
purpose-made device is obtainable. His was made by a "Ham in Florida" and
is very quiet - but he can't find the address of the guy who makes them.
Since my Vaio's brick output is 19.5V I guess a stepup tranformer has to be
part of any 12V input converter. Any problems with this approach and any
thoughts about who makes one?
Scott


"Meindert Sprang" wrote in message
...
"Bruce in Alaska" wrote in message
...
All very good advice, BUT if one were to put the BRICK in a metal box,
and bring the wires in/out of the box, with Feedthru Capacitors of say
.01uf, all that hash would stay inside the box where it belongs.
Old School technology from way back......

Correct. But much harder to accomplish. And it has the disadvantage that
the
power cord and the low voltage cord on the other side now form one large
RF
antenna while using ferrites, the entire string of wire is broken into
smaller parts which inherently radiate less and also pick up less. It
might
even be that in the first case you end up with a huge susceptibility for
RF
from the SSB....
Shielding works, but it would involve shielding and grouding of every
single
part in the loop. If that is not possible, it is best to break the loop
at
as many places as possible.

Meindert