[Elecraft] KX3 Battery Questions

[Wayne Burdick]

On Aug 16, 2012, at 6:00 PM, Pete Meier wrote:

> If you have batteries installed and then plug in an external power  
> supply to the KX3, which source is actually powering the KX3?

Whichever has the higher voltage.


>
> I noticed that, in the above situation, batteries installed and  
> external power source connected, that if I lowered the external  
> power source voltage, the KH3 remained at the battery voltage level.  
> So it appears that the batteries took over.

Correct.


>
> This makes me wonder if that external power source voltage is  
> "touching" the batteries.

No. Each has a diode in series, so they are fully independent of each  
other. The external supply cannot charge the batteries unless you have  
a KXBC3 installed, which provides additional circuitry.


> Can someone tell if I need to remove the batteries when I plug in  
> the external power source?

No need to do this.

73,
Wayne
N6KR




> I  don't want to apply that external power supply voltage to my  
> battery pack!
>
> Pete WK8S
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