John, that's more evidence that it's the forward and reverse power detection 
diodes in the KPA100 that failed since when you remove it the power detection 
function is handled by a separate diode detector in the base K2.

The base K2 doesn't have a full forward/reverse power detection circuit to 
calculate SWR. It uses a simpler diode detector to only measure the output 
power at the antenna connector and reports the power assuming a 50 ohm 
non-reactive load. The detector output tells the K2 when it is producing the 
power requested by the POWER control. 

Ron AC7AC

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of John Cooper
Sent: Thursday, July 07, 2011 4:10 PM
To: [email protected]; elecraft
Subject: Re: [Elecraft] k2 clicking

k2 by itself transmit fine, when hooked just to kat100 without kpa 100 it 
goes hi current during transmit no matter 2 watts or 15 watts.

-----Original Message----- 

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