[Elecraft] KX3/KX2 voltage display

[E T]

Ok, thanks, that makes sense.  One of my SLA maintenance chargers was only keeping my external battery around 12.7V, so once in a while I’d get the LO SUPPLY indicator when charging the internal batteries.  I just switched over to a different one (Black & Decker) that keeps the SLA closer to 13.8.  Of course when I use my PowerWerx supply I can set that to anything… :-)

  Thanks and 73,
  Erik Tkal  -  W1QED

On Jan 2, 2017, at 12:59 PM, Lyle Johnson <kk7p4dsp at gmail.com> wrote:

Hello Erik!

Yes, it is expected.  There is low-drop diode in series with incoming power to protect the radio circuitry from reversed polarity at the power connector.  The typical voltage drop is about 0.3V at nominal current.  The internal "12V" supply voltage being reported is after the diode's voltage drop.

Both radios share this characteristic.

73,

Lyle KK7P


On 1/2/17 10:46 AM, E T wrote:
> When using the special VFO B display to show the supply voltage, both my KX3 and KX2 disagree with the rest of my equipment.  The radios consistently are 0.2V - 0.4V lower than my inline meters and my Fluke when measured at my RigRunner distribution block and at the end of a cable (e.g. if I disconnect my PX3).  I don’t see any way to calibrate this, is this expected?
> 
>   Thanks and 73,
>   Erik Tkal  -  W1QED

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