A solid 15v (adjustable to 15v) supply is best, capable of 30 amp with good regulation. Good quality switch mode recommended.
A cable upgrade into the K3 is recommended too. The original K3 factory cable has too much volt drop, my replacement is 4 x the size of original csa. 15v in with cable upgrade to provide ~0.4v volt drop provides; Significant TX IM3 performance Elimination of high current warmings and bucks especially on 6m Instant full power as set on turn on & first TX, no "K3 power creep up to full level after a while" issue. No problem to run a P3 with svga adaptor direct from K3 as is without the 0.6 amp resettable fuse tripping. No mods required, and P3 turns on with the K3. Mine runs at 15.2v no-load and 14.8v loaded, and has never performed better. Adrian ... vk4tux -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Tuesday, 27 March 2012 3:19 AM To: elecraft@mailman.qth.net Subject: [Elecraft] K3 Power Supply On 3/25/2012 10:46 AM, Bill Miller wrote: > What is recommended for a K-3 power supply? (New owner) Any decent supply that regulates to about 13VDC will work well provided that it is not electrically noisy. I've used Astron linear supplies, and a compact PowerWerx unit rated for 20A. The latter is switcher, but I haven't found any electrical noise. For many years, all of the 12V rigs I've owned, and all of the 12V accessories on my operating desk, have been powered by a big Costco deep cycle battery that is float-charged by an el-cheapo regulated 10A switching supply that I bought for $10 at a hamfest about ten years ago. That switcher was REAL noisy, but I was able to tame it with a few capacitors and chokes on both AC and DC wiring. 10A is plenty to keep up with even the most serious contesting. 73, Jim K9YC ______________________________________________________________ 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
