[Elecraft] KX-1 Voltage Display

[Mike Morrow]

David wrote:

>display registers 12.2/3 volts; my DMM  across the
>battery terminals registers 12.60 volts.   

The KX1 MPU doesn't sense battery or power supply output voltage until it has passed through reverse polarity protection diode D2 or D3 (1N5817).  At the current that your KX1 is drawing, there will be about a 0.3 to 0.4 voltage drop across the 1N5817.  Your KX1 voltage display should be lower by that amount than the actual voltage being fed into the KX1 power connector.  It looks like your display is right on the money.

Mike / KK5F