[Elecraft] K3 External Speakers

[Jim Brown]

On 1/5/2012 9:26 AM, Joe Subich, W4TV wrote:
> The odd thing is that the COMSpkr appears to be the same device as many
> of the generic computer speakers*except*  the bypass/RFI suppression
> parts included on the chip makers reference design are present in the
> West Mountain Radio product but are lacking in the commodity products.

Those working professionally in the field of EMC (that is, RFI 
interference) know that this sort of problem is QUITE widespread. In 
most manufacturing companies, there is an engineer whose job it is to 
try to remove as many parts as possible from every product so that it 
can be made more cheaply and still be sold. RFI suppression components 
almost always the first to go.  Open up a noisy product (if you can) and 
you'll find empty holes on  the board where those parts should be.  The 
only time those holes are every filled is when the prototype is 
submitted for EMC testing.

73, Jim Brown K9YC