I don't think that this is normal. It depends upon the voltage drop on cable between the radio and power supply, as well as any voltage drop inside of the radio. I actually was measuring this yesterday. My supply reads between 13.7 and 13.8 on the K3 meter under receive. With 100W keydown, it was reading 13.2. This was a quick measurement and I didn't verify that the supply maintained constant voltage (it should have as it is a 25A supply). I have about 12" of 10AWG cable from the supply to the radio. I think that this drop is typical or maybe even slightly high. Your drop of 1.7V is way too high. I would inspect your DC cabling to the radio, correct installation of your powerpoles on that cable, and the connector pins on the KPA3 and KPAIO3.
At 6/2/2009 02:07 AM, Harris Leck wrote: >I am running my K3 off an Astron RS-35M. No load voltage at the rig >is 14.0V (per the K3 display). Running approximately 100W this >reading drops to 12.3V. Is this the norm? BTW current reads just >under 18 amps. The amp meter reading on the Astron is way off.73 Harris K9RJ > > > >______________________________________________________________ >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 ______________________________________________________________ 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
