Elecraft KX3 Assembly Manual - Manual (Page 31)

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If you have the KXAT3 ATU option to install at this time, mount the KXAT3 board as shown in Figure 43.
Be especially careful to ensure that all the pins on both connectors engage with their opposites on the RF Board.
It is normal for part of the length of the pins on P2 to be visible when the connectors are properly mated.
Figure 43. Installing the KXAT3 ATU.
If you did not install the KXAT3 in the previous step, plug the wire from the antenna connector into J7 on
the RF board as shown in Figure 44. Be sure the connector is oriented so that both pins engage J7 on the side
marked ANT.
Figure 44. Connecting the Antenna Cable to the RF Board.