[Elecraft] KX3 ATU not working

Don Wilhelm donwilh at embarqmail.com
Tue Aug 13 20:13:31 EDT 2019


Aaron,

Your tests leave a couple questions - I could assume, but I would rather 
not - unsaid things often reveal problems.

Are you powering the KX3 from an external supply having at least a 13.8 
volt output?

After you connected the dummy load, did you do an ATU TUNE?

Is there any chance you could have had a static surge on the antenna 
coax that could have zapped the wattmeter diodes?

Email support at elecraft.com to see if they can give you some points to 
measure.

73,
Don W3FPR

On 8/13/2019 6:42 PM, Aaron 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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