[Elecraft] Strange Voltage check for Extended Power Supply Leads to Elecraft K3s

[Hal Massey]

Your power supply isn’t regulating very well. Could be the power supply is having an issue. Or it is too small for the task. In tbe USA it is not uncommon for ham supplies to be somewhat overrated. For example many Astron 35A supplies are really the equivalent of a commercial 25A supply. 

> On Jul 24, 2021, at 8:38 PM, Peder Kittelson <peder.kittelson at gmail.com> wrote:
> 
> Thank you all for your help in reviewing my K3s transceiver in-line fuses,
> the fuse locations (they are near the power supply) and available voltage
> from my power supply for the K3s.
> 
> *I have a strange voltage pattern*.  The K3s manual says the voltage for
> the transceiver should be:  13.8 volts nominal, 11 volts minimum, 15 volts
> maximum.  The manual also says there should be only a voltage drop of .5
> watts.
> 
> My standing, receiving voltage is 13.9 volts.  When I transmit @100 watts, *the
> voltage drops to 13.4 volts* which is right on the recommendation numbers,
> so that seems good.
> 
> When I tune @ 20 watts, *the voltage drops to 12.6 volts*. Is that a
> problem?  Why is that number so much lower?
> 
> In both cases the signal goes through an external Palstar BT1500A tuner for
> my window line going to an extended multiband Zepp antenna.  In both these
> cases the internal k3s tuner is not activated.  There is no difference in
> the tuning, locally or externally by the Palstar tuner.
> 
> So does anyone have a guess at why this should be?  Do I need to make a
> change somewhere?
> 
> 73 and thanks to everyone,
> 
> Peder, W7RPK
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