[Elecraft] KAT100 question

[John Wiener]

I have been using the KAT100 for about a month now.  I very much like  
its operation.  My question:
After the relays  click and the SWR is nearly 1:1, on 7.007 MHz with  
a G5RV, my output is limited to 20 W.
I adjust for any higher level and I get 20 out (on LCD).  It seems at  
ANY freq on ANY band, I get 20 out.

I independently found less than 2:1 SWR on the G5RV at 14.230 MHz.

Why is the KPA limited to 20 watts using a reasonably efficient  
antenna at it's resonant freq (or near to it)?
I also checked on a wattmeter between XCVR and KAT...I get 20W out no  
matter what input I specify.
Did I forget to adjust something?

John
AB8O