Glad that a 20 A supply works for you, but the specs say: "12-15 Vdc (13.8 V nominal), at least 24 A peak capacity. About 1 mA parasitic drain current whenever dc power is connected.”
So for the least problems, make sure that your supply can deliver 24 A peak, not 20 A peak. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Apr 17, 2016, at 4:47 PM, Ron D'Eau Claire <r...@cobi.biz> wrote: > > A quality 20A peak supply is fine. For over a decade I've run a K3 and then a > K3S and, when those aren't on a KX3/KXPA100 off of an Astron 20 without an > issue as long as the finals see a decent SWR (current demand skyrockets as > the SWR goes up). At low SWR's none of the rigs exceeds 18 to 19 amps, max. > > The 20 means 20A peak current - ICS rated (5 min on 5 min off). That Astron > is rated at 16A continuous but Amateur stuff is almost never "continuous". > > Consider that 20A at 13.8VDC is 276 watts. As long as the rig is not way > below 40% overall efficiency there will be no problem. > > That's using a quality linear supply. I'm not so casual about a switcher or a > cheaper supply. > > I use the Elecraft supplied power cables on everything. > > 73, Ron AC7AC > > -----Original Message----- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Kevin > Stover > Sent: Sunday, April 17, 2016 4:19 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KXPA Power Output > > WRU nailed it. I missed it in the original posting. > You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad as it > gets. > Why didn't you use the power cable supplied with the amp? I believe it's #12. > What kind of power supply is running the amp? It has to be 25 amps peak > *minimum*, I'd say continuous. What else is being run on the same power > supply? > > ______________________________________________________________ > 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 > Message delivered to wun...@wunderwood.org ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
