http://elecraft.85.s1.nabble.com/KAt100-power-on-question-tp7618014p7618015.html
Made the same mistake. You need both power cables hooked up: one to the KAT100 and one to the K2. You can use a 'Y' cable to power both.
> On May 25, 2016, at 8:47 PM, mjpilgrim <
[hidden email]> wrote:
>
> I recently purchased a used KAT100. Not sure how to interpret a possible
> failing condition at Power UP time. Stupid Question: If I simply connect
> 12VDC to the DC power input jack on the KAT100 (without the K2 physically
> connected), should I see the lights eliminated on the KAT100? Reason I ask
> is because at one time during my initial hookup I seem to recall the lights
> on, but now they are not. Don't know if possibly my interface cable had a
> shorted connection, or what. Nonetheless, before I re-cable and try again,
> I just needed to ask if I might have a problem in which the lights do not
> come on. Upon close inspection of the interface cable I think I located a
> shorted connection at the KAT100 connection. I removed that shorted
> condition but I feel hesitant to plug in a try the operational status of the
> setup. Can anyone please tell me if the KAT100 lights illuminate when the
> 12VDC power is connected, or must the unit be calbed to the K2?
>
> Thanks,
>
>
>
> --
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