[Elecraft] KX3 - ATU Disabled Problem

[Larry Lopez]

I wonder if this might be the problem !!!

There is a very interesting post with the title:

"KX3 production firmware update, rev 0.97 -- very important bug fix, better
CW QSK, etc."

KX3 production firmware rev 0.97 (with DSP rev 0.84) is now available.  
It corrects a problem in the power-on/off sequence that could  
inadvertenly modify EEPROM locations (that is, operating parameters).  
It has other significant improvements as well. See recent release  
notes below.

...

* EEPROM DATA INTEGRITY IMPROVED: Previously, in rare cases one or  
more EEPROM locations could be modified during power-on/off cycling.  
Symptoms included “ERR TXC” or “ERR TXS” messages, AGC turned off, etc. 




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