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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
