John,
Jack's comments are spot on - If the KPA100 and/or the KAT100 are housed
in an EC2 enclosure (same size as the basic K2, then it is possible, but
if the KAT100 is mounted on the K2 itself, then the 20 watt KAT2 cannot
be mounted, they would have to occupy the same physical space.
If what you are considering is a 2 box rig, then it is possible, but not
in the single enclosure.
Note that the KPA100 and KAT100 and the EC2 enclosure have been
discontinued while the QRP K2 currently lives on.
73,
Don W3FPR
On 7/22/2026 3:02 PM, Jack Brindle via Elecraft wrote:
When a KPA100 is installed in a K2, there is no space for the ATU. But it also
doesn’t make sense to use that ATU since it will only handle 20 watts and would
be destroyed by the 100 watts of the KPA100.
A number of customers acquired the external cabinet (EC2 was it?) and mounted
the KPA100 and KAT100 in it. In this case the ATU could stay in the K2’s
enclosure for use when it was disconnected from the KPA/KAT.
The K2 enclosure has room for two items - the ATU and a small lead-acid
battery, which recharged when the K2 was plugged in to 12V power.
My K2 has every option we made, although the battery has long ago expired and
been removed. It is a really good little radio, and a lot of fun to build and
holds a prominent place on my desk. Still, I far prefer my K3s for their
performance.
Unfortunately many of the K2 options have been discontinued since components
are no longer available. Still, a fun rig to use, and definitely recommended!
73,
Jack, W6FB
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