Sure. If I were buying a supply today I'd get a 35A. But the 20A was in hand and so I used it and I was just sharing my experience with it.
73 Ron AC7AC -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Kevin Stover Sent: Sunday, April 17, 2016 5:08 PM To: [email protected] Subject: Re: [Elecraft] KXPA Power Output I see your points. I'm just a little more conservative (paranoid) than others. I like a little headroom. I've got a pair of RS-35M's that are 24 and 20 years old. I can't kill em. On 4/17/2016 6:47 PM, Ron D'Eau Claire 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:[email protected]] On Behalf Of > Kevin Stover > Sent: Sunday, April 17, 2016 4:19 PM > To: [email protected] > 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:[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] > -- R. Kevin Stover AC0H ARRL FISTS #11993 SKCC #215 NAQCC #3441 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ 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]
