[Elecraft] KX1 ATU is resetting from TUN to CAL by itself

[David Pratt]

Hello Mike -
I had a similar problem a while ago and Wayne suggested fitting some 
bypass capacitors in various places around the processor on the ATU 
board. Unfortunately I am unable to get to either the information or the 
rig at the moment as the contents of the shack are in storage due to 
building repairs.

In my case, during an over while I was transmitting, the KX1 started 
retuning the antenna and ended up with a very low power and a high SWR. 
Fitting the capacitors as Wayne suggested totally cured the problem.

73

David G4DMP

In a recent message, Michael Madden <n9ohw at yahoo.com> wrote ...
>I took the KX1 out yesterday for more field testing.
>This time, I wrapped with a torroid the 6" unshielded
>lead from the external battery holder.  The idea here
>was that RF was getting into the 6" battery lead and
>somehow the dirty DC was tripping the ATU controller.
>
>Well, at first, it seemed like the problem was solved.
> But after about 1 hr of having the KX1 on, I started
>getting the problem again.  (The problem with the ATU
>switching from TUN to CAL by itself when I start
>transmitting.)  This time, I only saw it on 30M.  But
>it was intermittent:  when it started happening, I
>shut the rig off, turned it back on, switched bands,
>and then I wouldn't get it for a while.