[Elecraft] K3 voltage under load

[Guy Olinger, K2AV]

It only takes about ** a tenth of an ohm ** between K3 and power supply to 
drop 1.7 volts at 18 amps.  Size of wire, bad crimp in a connector, tiny bit 
of corrosion, etc., etc.

AND, the tenth of an ohm may be spread out in different places.

I have three feet of #10 to the K3, and I drop from 14.2 to 13.8 at 100 
watts using an Astron RS 35A I adjusted up just a teeny.

73, Guy.

----- Original Message ----- 
From: "S Sacco" <nn4x.steve at gmail.com>
> Harris -
>
> This is likely due to "I squared * R" losses in your DC cable; the voltage
> is being reduced by the resistance of the cable.   I had the same problem.
>
> How long is it?  What gauge is it?  Are there any fuses or other items
> in-line with it?
>
> 73,
> Steve
> NN4X
>
>
>
> On Tue, Jun 2, 2009 at 2:07 AM, Harris Leck <vk6av at yahoo.com> 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
>