[Elecraft] Interesting Occurence last night

[Bob N3MNT]

While sending traffic on a net last night had the following strange
occurrence.
Setup KX3, KXPA100 Running 30W, PX3, OCD with standalone SWR 1.6 on 80M.
tuned SWR 1.1

After about  10 mins sending CW, QSK went silent SWR went off charts and amp
went into protection mode with Ant Fault warning.  

Shut down.   checked SWR of stand alone ant  1.6 ( at input to amp)
reconnected and turned radio back on,  went into protect mode with Ant
Fault.
Checked display and noticed amp had switched to Ant2.  I had Ant 2 disabled
via utility, but apparently that was reset when I did an firmware update.
Disabled Ant 2 again and switched to Ant 1   
All is well. 
Not sure how ant switched as nothing was touched in KX3 or amp.   




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