Glad I could help.
<S Pamfree> wrote in message
|
| Hi Jim,
| Thank you very much.
| Your Information was really most helpful.
| It was quite an eye opener.
| I know now what to look for.
| Thanks again and have great day
| Manfred
|
|
|
| On Sat, 30 Apr 2005 09:07:59 -0500, "Jim Macklin"
|
| >In the USA the FCC certifies computers and other devices
| >under FCC Part 15. You'll see a label for all legally
| >imported and sold equipment. But there are two
standards,
| >part A and B. Part A applies to office equipment and the
| >standard allows more RF emissions since office are
| >considered industrial zones with a higher allowed level
if
| >interference.
| >
| >The use of FCC Part 15A equipment in residential areas is
no
| >fully legal. If your neighbors report interference the
FCC
| >will make you replace the equipment or take other action
to
| >stop the interference with others use of their equipment.
| >
| >The reason the ;laptop doesn't cause RFI is that it is
Class
| >B, look on the bottom and you'll see the label.
| >
| >The case on the computer has to be a Faraday cage,
| >electrically closed to keep the RF energy inside the
| >computer. If it has bad wires, poor connections and
| >especially a plastic window so you can see all those
lights
| >and fancy fans, you have a perfect RF transmitter.
| >
| >If you have to have windows and such, then you need to
have
| >a grounded screen (like in the door of a microwave oven)
to
| >contain the RFI.
| >
| >Google for "fcc class b" and you see all the info, here
is a
| >good link from nearly a million hits..
| >...
http://www.emclab.umr.edu/emcproc.html
| >UMR EMC LAB: EMC Regulations
| > ... The FCC Rules and Regulations, Title 47, Part
15,
| >Subpart B regulates ... Class B devices are those that
are
| >marketed for use in the home. ...
| >
www.emclab.umr.edu/emcproc.html - 7k - Cached -
| >Similar pages
| >
| > --
| > The people think the Constitution protects their
| >rights;
| > But government sees it as an obstacle to be
overcome.
| >
| >
| >
| >
| >| >| That filter inside the Belkin exists. And then we
apply
| >| numbers to that filter. A numbers so small that the
| >filter
| >| really does not exist. Many protector manufacturers
make
| >| claims without numbers - so that you will believe
myths.
| >That
| >| Belkin also claims ineffective surge suppression AND
can
| >even
| >| contribute to damage of the adjacent hardware. But
again,
| >| notice the missing numbers.
| >|
| >| Any filter that is going to work on a power cord is
| >already
| >| inside the power supply. Filtering all but required by
| >FCC
| >| and by so many other nation's regulations. Some power
| >| supplies are being marketed to technically naive
computer
| >| assemblers who hype how much cheaper their computers
cost.
| >The
| >| AM radio should identify some such products.
| >|
| >| Some computer assemblers buy only on watts and price.
To
| >| sell a power supply at less than $60 retail, that
filter
| >is
| >| but another essential function routinely forgotten in
| >cheaper
| >| power supplies. Same filter that the Belkin also does
not
| >| (for all practical purposes) provide. Belkin 'power
| >| protection' products also may deceive by forgetting to
| >provide
| >| numbers and other significant facts. But then if that
| >Belkin
| >| filter exists, how many dBs of filtering for each
| >frequency?
| >| Why did they not provide those spec numbers? Because
they
| >| don't provide any useful filtering.
| >|
| >| S, Pamfree wrote:
| >| > Hi Tom,
| >| > Thank you very much for great response.
| >| > The Belkin is a small plug in surge surpressor with
| >filters. Of course
| >| > it didn't work.
| >| > I will have to find out if there are any computers on
| >the market, free
| >| > of this problem.
| >| > Thanks again
| >| > Manfred
| >| >
| >| > On Wed, 27 Apr 2005 18:55:16 -0400, w_tom
| >| >> What Belkin filter? Did you speculate that a
Belkin
| >| >> protector is a filter?
| >| >>
| >| >> Now from desktop systems is often due to clones
built
| >on
| >| >> price - therefore missing essential functions such
as
| >the
| >| >> required RFI filters in power supply and on
| >motherboard.
| >| >> There is no plug-in solution to your problem. Your
| >problem is
| >| >> solved at its source. For example, what is that
power
| >| >> supply. Does it even specifically claim to meet FCC
| >| >> requirements? If not, start asking yourself what
other
| >| >> essential functions are also missing inside that
| >computer.
| >| >>
| >| >> AM radio is one good diagnostic tool it identify
| >computers
| >| >> that are missing essential functions. A symptom
that
| >should
| >| >> only have you asking more embarrassing questions.
| >
|
