The KX3 has a Schottky diode as protection against connecting an external power source with reverse polarity. The voltage drop is typically about 0.3 V during receive.
wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jun 11, 2019, at 1:34 PM, George Pasek <[email protected]> wrote: > > I have a external TalentCell 12v Li-Ion 12800mAh Battery Pack that I have > been testing on my KX3. At the same connection point as the battery (KX3 > 9-15vdc Power Input) I have my Fluke 177 multi-meter and a EB_M05 that I use > to plot the battery pack voltage discharge. I noticed that the Fluke 177 and > EB_M05 will both read the same battery pack voltage but the KX3 voltage > display shows about 0.2v lower on Receive and about 0.6v lower on Transmit, > as if there was a series diode involved with the display voltmeter. The KX3 > 10w output is rolled back to 5w when the KX3 voltage display drops below > 10.0v. So at this point on transmit where the KX3 is displaying PS 10.0v, > the Fluke and EB_M05 are showing 10.6v. If the KX3 were displaying the same > as the Fluke (10.6v) I would have a additional 0.6v @ 2000ma available to > support the “Use higher power at 10 V only when necessary to complete > critical communications”. > > George > > WD0AKZ > > > > --- > 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]
