The KAT500 needs at least 20 watts for effective tuning. Apparently your antenna system is breaking down at some level below that.
Inspect all insulators and feedline connections.

73,
Don W3FPR

On 10/30/2016 6:50 PM, Bill Wiehe via Elecraft wrote:
Thanks Tom for your feedback. I did conduct the test and down to 2 watts the 
KAT500 still searched for a tune.As I indicated when connected direct the  K3 
ATU finds a reasonable match at the any power level from 2 to 100 
watts.Regardless, it still points to the antenna as the problem.  Will check it 
out further.Thanks,Bill - W0BBI

      From: Bill Wiehe <[email protected]>
 To: Elecraft Reflector <[email protected]>
 Sent: Sunday, October 30, 2016 2:20 PM
 Subject: KAT500 - Tuning Anomoly

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