[Elecraft] KX3 VFO B Alternate Display ?

[Rich Heineck]

Phil,

That is correct.  The battery '+' and external supply '+' are connected 
together.  The voltage at the battery's negative terminal is measured 
and subtracted from the voltage at the '+' side.  So with no batteries 
installed, 0V would be read at the batt '-' side. And when no external 
supply is connected, BT and PS will also read the same.  This is all 
related to how the battery and external supply are isolated from each 
other through the diode 'OR-ing' circuit that allows the higher voltage 
of the two to power the radio.

73,
Rich  AC7MA


On 07/15/2013 09:33 PM, Phil Hystad wrote:
> On the KX3 VFO B Alternate Display you read Time, Power Supply Voltage, Battery Voltage, and so forth.
>
> So, my question is regarding the BT (Battery Voltage) display.  I assume that this reads the same as the external power supply voltage level (PS) if there are NO batteries in the battery holder.
>
> I never paid too much attention to this before and I have had batteries installed almost from the time I put the KX3 together so I have not noticed this before.
>
> So, can someone confirm that if no batteries are used that BT shows the same reading as PS?  I can understand how this might make some sense but I think I would prefer that BT show zero volts (or, N/A) or something if no batteries are installed.
>
> Thanks
>
> 73, phil, K7PEH
>
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