I've heard similar things about APC UPS's. However I now have 5 of them sprinkled throughout the house and the modern versions (c last 3 yrs) are clean. I also have a cyberpower UPS that claims sine wave output that is clean. I needed the latter for one computer that would not accept the pseudo sine wave output of the APCs. All clean whether on commercial power or supplying power. YMMV of course.
But if all he wishes to do is not yank the power out from under the K3 so it can be shut down cleanly, I agree with K2AV. Plug it into your computer's UPS as stated. That's exactly what I do with mine. And my UPS is hefty enough to run the K3 barefoot for 10-15 minutes. Most power outages are far shorter than that here in rural upstate NY. 73/Gary W2CS >-----Original Message----- >From: elecraft-boun...@mailman.qth.net [mailto:elecraft- >boun...@mailman.qth.net] On Behalf Of Van W1WCG >Sent: Thursday, August 18, 2011 7:38 PM >To: elecraft@mailman.qth.net >Subject: Re: [Elecraft] K3-Front panel shut down question. > >Not necessarily true -- I had an APC UPS that created continuous >60Hz-flavored hash on all ham bands (at least up to 21 MHz), S6-S7 >level, whether commercial power was present or not. I wrote to APC and >they said their equipment met FCC regulations with regard to spurious >emissions, and very kindly sent me a deluxe noise-and-surge suppression >outlet strip. It made no impression whatsoever on the noise, nor did >one clamp-on ferrite bead (all I had that would fit the cord at the >time) on the AC supply cord next to the unit make any difference. >Perhaps if I had had enough beads to put a couple on every cord plugged >into the UPS as well, it would have helped. I just got a Tripp Lite UPS >of the same size and had no further trouble. > >Van, W1WCG > >On 8/18/2011 2:42 PM, Don Wilhelm wrote: >> Someone also mentioned that the UPS might generate some hash - BUT >that >> would only be true if the AC is removed from the UPS. Under normal >> conditions with AC present, the inverter is not active. >> >> It was not the initial question, but -- if you want to keep >transmitting >> after an outage, you will have to implement the large battery >solutions >> that have been mentioned. >> >> 73, >> Don W3FPR >> >> On 8/18/2011 2:22 PM, Guy Olinger K2AV wrote: >>> I'll repeat W2CS suggestion, get a UPS, then plug the K3's power >supply into >>> the UPS. Since you are trying only to allow yourself to shut down >cleanly, >>> you can get the smallest capacity, and therefore the cheapest >version. It >>> will handle the K3's RX current for quite a while, even with a small >UPS. >>> >>> Some of the commentary seems to be about creating a full run floating >>> battery alternate supply. If you want that, it's one approach, but >if all >>> you want is orderly shut down, you hardly need go that far. >>> >>> If you already have a UPS for your PC, plug the K3's power supply >into that >>> UPS. When you are operating with AC the extra drain makes no >difference to >>> the UPS. When the power goes down, cease transmitting quickly and >you will >>> be fine. The K3 in RX only adds about 20 watts to the load on the >AC. >>> >>> 73, Guy. >>> >>> On Thu, Aug 18, 2011 at 10:36 AM, Ron D'Eau Claire<r...@cobi.biz> >wrote: >>> >>>> The danger with the K3 seems to be if power is removed while it's >actively >>>> writing new data to memory. Early in the K3 program several people >who >>>> switched power off at the supply quickly reported finding the >firmware >>>> "corrupted" in various ways upon restoring power because of that. >>>> >>>> Certainly no physical damage was done, but it is rather inconvenient >to >>>> reload all the firmware. >>>> >>>> 73, >>>> >>>> Ron AC7AC >>>> >>>> ______________________________________________________________ >>>> 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 >>>> >>> ______________________________________________________________ >>> 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 >>> >> ______________________________________________________________ >> 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 >> >______________________________________________________________ >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 ______________________________________________________________ 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
