[Elecraft] KX3 ATU goes off/on during send?

[NZ9E]

Gernot,

Your KX3 might be behaving correctly.

E.g., when tuning across a band edge, the KXAT3 is designed to automatically
change to the last tuning of the new band.  This is a feature, to save the
battery (don't need to retune just to change bands, if you've already auto
tuned on the new band), and to not clutter the spectrum with auto tuner QRM.

If you know that's not the explanation, say because you get the intermittent
clicks while staying within some band and don't tune outside that band, you
could try a diagnostic, by running the following macro in the "Elecraft KX3
Utility" app on your computer:

BN;FA;AK;

Run the macro once and note the output in the "Command Tester/KX3 Macros"
output pane.  Here's some example output:

BN;FA;AK;BN01;FA00003581500;AK002601;

This example output reports the VFO A freq (~3.58 MHz) and KXAT3 L, C, &
config settings.  I.e., "AK002601" says there are currently no L's in the
L-net ("00"); C13, C9, & C8 are in-circuit for a total of approx. 454 pF
("26"); and some standard L-net configuration ("01") that I don't know
because the KX3 schematics aren't yet published.

OK, now use your KX3 until you hear the next intermittent click.  Then run
the above macro again, and compare the new macro output with the old.  If
the "AK" command output doesn't change (and you stayed in the same band),
then I don't know what is causing your clicking, but I'm thinking it's not a
problem with the KXAT3.  If the macro output does change, I would contact
Elecraft Support for help.  There are other diagnostics that can be run.

73,
Bob NZ9E



DF5RF wrote
> During ARRL-DX - running 5 watts -  I noticed a faint click in the KX3, 
> occassionally. I tried to reproduce but couldn't. Later I noticed the 
> ATU-sign was blinking briefly after the click.
> I checked SWR, but KX3 says 1:1, and a quick ATU- tune confirms the 1:1.
> I'm a alarmed now - I don't want to see my ATU in smoke. But I don't 
> have a fix or workaround yet.
> Anybody else experienced this problem?
> tnx es 73
> Gernot
> DF5RF





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