[Elecraft] KX3 is "ON" after AC power outage

[Matt Zilmer]

Hi Ken,

It's possible that the KX3 is getting an outside signal to power on.
If you have a cable attached from ACC2 to a device that behaves as
described below, it could cause the KX3 to power on.  I don't know
what device type to suggest, because I don't know your station's
layout.

From p28 of the Owner's Manual:

Remote Power On/Off

To turn the KX3 on, a remote-control system can
place 8 to 12 volts DC on the mic jack’s PTT line
for 100 ms or longer. (The ACC2 jack’s PTT IN pin
function cannot be used for power-on control. Use
only the MIC PTT line.)

To turn the KX3 off, the controller must send the
KX3 a “PS0;” command via the ACC1 jack (RS232
or USB, depending on the cable used). If the
controller also turns off the KX3’s power supply, it
should first allow 100 ms for the KX3 to shut down.On Thu, 3 Apr 2014
15:50:48 -0600, you wrote:

73,
matt W6NIA

>Have had two AC outages recently and both times my KX3 ... which was "OFF"
>... has turned "ON" with the return of power.  Everything in the shack is
>powered by a large Astron PS that runs 24/7 via RigRunner fused Power Pole
>boxes.
>.
>The KX3 comes on in "receive" mode and set  for CW.  Has anyone else seen
>this "odd" behavior?
>
>73 -  K0PP


Matt Zilmer, W6NIA
www.elecraft.com
831-763-4211  x129
Skype: matt.zilmer