Owner s manual is available on Elecraft s website.
There page 64 says:
The KAT3 provides a wide-range, switchable C-in/C-out L-network for matching
a variety of antennas with SWR as high as 10:1 (100 W) or 20:1 (10 W).
There are 8 inductors and 8 capacitors
in the L-network, each switched with a DPDT relay for high reliability.
The KAT3 also includes a second
antenna jack and associated switching relay. There’s an additional jack
on the board for routing the unused (nontransmit)
antenna to the KRX3 sub receiver module.
Highly recommended.
Benny OH9NB K3 #119
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