I lost a PC power supply, ordered a pair of replacements from Tiger Direct. They were neither half-KW monsters nor their cheapest supply. It had VDE/UL/FCC stickers, ALL of the agency certifications.
Suspecting a line surge had killed the original supply I decided to stuff some MOV at the input connector of the new supplies before I even installed them. I opened the cases and found The PCB silkscreen showed RFI filter components, but none were installed: the board had direct wire jumpers from power in to the switching circuits. I connected it to the motherboard and found switcher EMI over the HF spectrum. For the record, my shop is in the garage, powered from seperate breakers, shop strips have 30A/230V encapsulated line filters and their own MOV. The radio gear was in a bedroom with coax feedlines goubg directly outside, buried for 250 feet to a yagi 50 feet in the air. No open wire feeders, no longwires direct to the shack. It seemed pretty clear the supplies had passed agency approvals with the filter components in place, but once they had the sticker they stopped putting those parts on the board. Bill - W7AAZ ______________________________________________________________ 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
