Mike,
I don't have a KX3, but the first thing I would do in this case is measure the voltage from the batteries when transmitting. Maybe the voltage is dropping severely enough to cause a problem.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 20 May 2016 21:15, Mike Weir wrote:
I took my KX3 out on the trail today and for the first time ever I
got ERR TXG and D=114? I looked things up on my Iphone and seemed it
needed a TX gain calibration. It never has done this in the past but
I figured maybe because I loaded on the new firmware that gives me
more Transmit power. I took the rig home hooked it up to a dummy
load, plugged it into my power supply and ran the TX gain calibration
from the KX3 utility. All went well and it passed, I then removed it
from the power supply and on battery power I put the rig into
transmit (holding the XMIT button in CW mode) and I received the same
message. On the home power supply no problem but on the internal
batteries I get the error message. VE3WDM Mike
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