I have a K3 that behaves similarly to what Mike described. I switched from an Astron 25 amp (15 years or more old) power supply to a switching power supply. Problem solved. One would think the problem was my Astron power supply, but I don’t see any such power drop when I use my Astron with other 100 watt rigs. Very strange.
Jimmy Walker, WA4ILO Macon, GA > On Feb 25, 2019, at 1:58 PM, donov...@starpower.net wrote: > > > Hi Mike, > > What are your voltage readings at the power supply end of your > six foot power cords? > > > None of my K3s do behave the way you describe. > > > 73 > Frank > W3LPL > > > ----- Original Message ----- > > From: "mjpilgrim" <mpilg...@bellsouth.net> > To: elecraft@mailman.qth.net > Sent: Monday, February 25, 2019 6:55:01 PM > Subject: [Elecraft] K3/100 Voltage Drop when transmitting > > At first i suspected my Solar power system which was installed a year ago, > but now I plugged my K3 S/N 7317 directly into my 25A switching DC power > supply, and when key down, 100W in CW, on the internal K3 Power Meter i see > a voltage drop from 13.6 to 12.0VDC. My power cord is a 6', 10ga stranded > copper wire pair with Andersen Power Pole connectors. I have tried three > separate power cords, all 10ga with power pole connectors, but with no > change in the voltage drop scenario. If anyone has suggestions of where the > problem lies, I am all ears. Obviously, when operating SSB the drop is > present but not as severe. What am i dealing with? Better yet, how do i > fix it? Thanks in advance. > Cheers, > Mike, K5MP > > > > -- > Sent from: http://elecraft.365791.n2.nabble.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 > > ______________________________________________________________ > 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
