[Elecraft] K3 voltage under load

[Ed K1EP]

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
>
>
>
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