The recommended 13.8V minimum is for the external supply, and does take into account the diode drop.

73,
Rich  AC7MA


On 01/27/2013 03:42 PM, Ron D'Eau Claire wrote:
Mine charges just fine from a 13.8 VDC supply.

73 Ron AC7AC

-----Original Message-----
Hi,
I believe your PS reading is too low. The PS reading on the KX3 should be at
least 13.8 volts. There is a polarity diode so your ext power supply should
be 14+ volts.
At least this what my KX3 needs to charge.
73
Jim H  K7SSS

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