I worked as an engineer and in marketing for a major power supply company. I did many design reviews and cost analysis on various MW power supplies.
The designs are straight forward and their derating guidelines were not as robust as the ones I used. One area that they "just met spec" was for conducted EMI. You need a unit that meets level B, with VDE level B most stringent. The products I designed had a minimum of 6 dB margin on conducted EMI. Robust EMI filtering costs money. Ripple current in the electrolytic caps of MW is also pushed hard. In some cases, they use 85 versus 105 degree Centigrade capacitors, again for lower cost. In your application, I suspect you will not be running at 50 deg C ambient, so that in itself will provide derating to the power supply. Artesyn makes a standard product line of power supplies sold through their distribution channel. They are good, very good, and easily meet all their published specs with margin to spare (especially EMI). If you used one in your shack, it will outlive you. I am surprised that people that own one of the best amateur radio transceivers in the world, would put a weak link in the chain of the overall system. But then again, I am out at 4 sigma on the curve and companies typically do not design for my "needs" ;>) Jim W6AIM . -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Peter Pauly Sent: Thursday, October 29, 2015 4:52 AM To: Elecraft Reflector Subject: [Elecraft] Which of these would make the best power supply for the K3(S)? I'm looking at the Meanwell power supplies because they are cheap and seem to be well regarded. I've come up with these two choices, feel free to give more suggestions of other models. I've seen talk on this reflector of supplying more than 13.8V to the K3S so that's why I'm looking at the 15V model. 12V Model: Meanwell NES-350-12 Voltage range 10-13.5V 29A 15V Model: Meanwell NES-350-15 Voltage range 13.5-18V 23.2A The 15 volt model would seem to be the obvious choice, except that it doesn't supply the recommended 25 amps. The K3S manual says 22 amps typical though. Is there another model Meanwell I should be looking at that has better protection or filtering? I've already got an Astron switching power supply, the Meanwell would be a second alternative. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
