[Elecraft] KX2 Amp Hours

[Don Wilhelm]

Erik,

That "choice" is a simple matter of the two reverse voltage protection 
diodes (one on each supply input).  The higher voltage will prevail, no 
switching or additional sensing is necessary. That same condition exists 
on the KX1, KX3 and KX2.
Much more complicated circuitry would be required to determine which 
supply is providing the voltage.

73,
Don W3FPR

On 12/12/2016 7:34 PM, E T wrote:
> Hi Don,
>
> Actually, I think it does have the capability to determine which 
> supply is in use, since it explicitly chooses the higher voltage for 
> operation.  So in the software it would be possible to not accrue Amp 
> Hours when not using the internal battery.  :-)
>