As alway...way cool. Lee K0WA
On Sun, Jun 9, 2019, 6:16 PM Jim Brown <j...@audiosystemsgroup.com> wrote: > On 6/9/2019 7:52 AM, Peter Dougherty wrote: > > Any suggestions? Within reason, cost isn't a > > major issue. > > Sure. Another linear Astron, maybe bigger, higher power rated. I don't > know how common the buzzing problem is. As Lee suggested, tighten screws > and bolts on the one you have if you still have it. > > Another important thing with Astrons is to fix their bonding problem, as > described in this link. > http://k9yc.com/PowerSupplyBondingAndAudioDistortion.pdf > > BTW -- I still do the big float-charged battery thing, but it's now a > 100Ah Bioenne Power LiFePO4, and the charger is a spare power supply for > one of my Thinkpads, using a Genasun solar charge controller. That's > not an inexpensive solution, but it IS a very good UPS for the radios, > AND the supply voltage stays above 13.2V under load as measured within > the K3, there's less IMD on TX. The Genasun controller is RF quiet, and > allows the Thinkpad PSU to charge the battery at about 7.5A. Make sure > that you buy the 14.2V version for LiFePO4 chemistry. > > > https://www.amazon.com/Genasun-GV-10-Li-14-2V-Controller-Lithium-Batteries/dp/B01N6AXQZH/ref=asc_df_B01N6AXQZH/?tag=hyprod-20&linkCode=df0&hvadid=198068984819&hvpos=1o4&hvnetw=g&hvrand=17014603795544971507&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032155&hvtargid=pla-354296381972&psc=1 > > I use a separate sealed lead-acid battery to run the other 12V stuff, > which includes antenna switching relays, LED lighting, three LCD > monitors, and several accessories. It's charged by another Thinkpad PSU > with a lead-acid version of the same Genasun controller. I do, of > course, have multi-turn ferrite chokes on the chargers and on the LCD > monitor power and video lines. > > For about half of my contesting, my K3s run at about 50W driving an 87A > or 25W driving a KPA500, and this DC power arrangement has no trouble > keeping up. > > 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 > Message delivered to lee.bul...@gmail.com ______________________________________________________________ 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
