[Elecraft] K3 KPA100 not putting out in high power

[Michael Carter]

Hi Jim,

Since the bypass relay actuates, can you check the
KPA3 (or KPA3A, depending on which generation
of K3 you have) input side of the relay to verify
that the relay is doing its job, i.e. that RF is making
it onto the KPA3 input?  A scope is best,
but a simple RF probe and DMM would also suffice.
The principal difficulty is accessing the KPAIO3
board on which the bypass relay is mounted.

If the relay is switching the TX drive into the KPA3,
but you're not seeing any output power from the
KPA3, there are several places where the KPA3
module can fail and produce that effect.  Keith,
WE6R, the Elecraft K3/K4 tech par excellence,
may advise how best to test the KPA3 module
since the component side is not accessible when
it's mounted in the K3.

73,
Mike, K8CN