[Elecraft] KX3 ATU not working

[Howard Saxion]

The only time I have seen this SWR on my KX3 is when the internal batteries (eneloop) were partially discharged and the voltage was 8.5 vdc (tuning caused the voltage to drop to 8.2 vdc).  I noticed this when testing beta firmware for Elecraft to assess ATU behavior using different voltages  Have you tried connecting your KX3 to an external power supply that delivers 13.4 vdc and at least 2a? If this does not address the issue contact Elecraft support. 

73 Howard WX7HS 


> On Aug 13, 2019, at 15:44, Aaron <k5atg.aaron at gmail.com> wrote:
> 
> For some reason, I could not reply to the mail list.
> 
> The ATU on my KX3 is not tuning. When I hit the tune button I hear the
> relays and the display shows an SWR of 25.4-1
> Here is what I have done so far.
> Under the menu, the ATU MD is set to Auto
> I hooked the KX3 to a dummy load with a good piece of coax and it still
> showed SWR of 25.4-1.
> I opened the KX3 up, removed the batteries, removed the 2-meter
> transverter, and removed the ATU. The cable from J1 to the BNC was well
> connected at both ends.  Upon inspection, I could find no loose cables or
> parts in the rest of the KX3.
> I reassembled everything and I am still getting an SWR of 25.4-1 with the
> dummy load.
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