[RFI] FW: Sweden imposes higher levy on electricity bills for EMC | Southgate Amateur Radio News

[Jim Brown]

On 12/30/2021 12:00 AM, Joe wrote:
> Decent filtering devices cost a lot less money!

Filtering devices are rarely a necessary solution if equipment is 
designed and built not to radiate or conduct noise! It's simply a matter 
of good engineering practice with that as a design objective. That 
includes good circuit design, good construction techniques, proper 
wiring, and in the case of systems like solar systems, proper installation.

A VERY common cause of RFI both to and from equipment is improper 
termination of cable shields, which SHOULD go to the shielding enclosure 
but go through it instead to the circuit board. A similar error is 
commonly made with termination of the green wire in mains power wiring 
to equipment, and the omission a few inexpensive components to prevent 
conduction of noise to mains power wiring.

As long ago as 1964, when I first worked in manufacturing as an 
engineer, there existed a department whose job it was to remove 
components to reduce cost until the product no longer worked. If you 
open up almost any product connected to the power line, it's VERY likely 
that you'll find empty spots on the circuit board where parts were there 
for EMC certification, but not there when products went into production. 
And these parts cost pennies.

73, Jim K9YC