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<[email protected]> 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:[email protected] >>> >>> 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:[email protected] >> >> 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:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
