Elecraft KX3 Assembly Manual - Manual (Page 32)

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If you have the KXFL3 filter option, install it as shown in Figure 45. The connector is at the opposite end of
the RF board from the antenna connector near the shield you installed on the RF board earlier. Be sure the board
is oriented as shown and that pin 1 of the KXFL3 board is in the connector hole closest to the end of the KX3.
Note that two holes in the female connector are not used. The KXFL3 board has only ten pins. The new, longer
screw through the bottom cover and heat sink does not make electrical contact with the hole in the KXFL3
board. It is there to ensure the board cannot be dislodged by rough handling of the KX3. If the screw strikes the
board instead of entering the hole, you have the KXFL3 plugged in incorrectly.
Figure 45. Installing the KXFL3.