KXAT3 Memory

[John Maass]

​My KXAT3 internal antenna tuner clicks and finds a match for my KX3. It
has been an intelligent and flawless work horse for using my doublet on all
HF bands, 450-ohm line, 4:1 balun, and short coax, good reports, fine DX.
However, it now appears to be failing to remember settings. It began by
needing resetting upon band changes. Then it began needing resetting
within band. Then needing resetting upon even small changes in VFO
frequency. Now it has taken to not holding a setting at all. Upon
transmitting, antenna SWR will go high. Tapping ATU TUNE again will begin a
new matching process. And, again, SWR goes high upon transmitting. Have any
of you experienced this? Have any of you a known remedy? I have begun tests
with an imperfect dummy load (a 15-watt light bulb). The KXAT3 will bring
the light bulb's SWR of 3.3:1 down to 1.5:1. When transmitting, SWR reverts
to 3.3:1.

John, K7JKZ
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[Don Wilhelm-4]

John,

Check the ATU menu setting - it should be set to AUTO.
As another thought, are you connected to the computer running software
that could possibly issuing a [CLR] command?  That will reset the ATU
memory for whichever band you are operating on.
Think about anything you might have added/changed since it performed
properly in the past.

73,
Don W3FPR

On 12/5/2015 8:27 PM, John Maass wrote:

> ​My KXAT3 internal antenna tuner clicks and finds a match for my KX3. It
> has been an intelligent and flawless work horse for using my doublet on all
> HF bands, 450-ohm line, 4:1 balun, and short coax, good reports, fine DX.
> However, it now appears to be failing to remember settings. It began by
> needing resetting upon band changes. Then it began needing resetting
> within band. Then needing resetting upon even small changes in VFO
> frequency. Now it has taken to not holding a setting at all. Upon
> transmitting, antenna SWR will go high. Tapping ATU TUNE again will begin a
> new matching process. And, again, SWR goes high upon transmitting. Have any
> of you experienced this? Have any of you a known remedy? I have begun tests
> with an imperfect dummy load (a 15-watt light bulb). The KXAT3 will bring
> the light bulb's SWR of 3.3:1 down to 1.5:1. When transmitting, SWR reverts
> to 3.3:1.
>
> John, K7JKZ
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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