Elecraft KX3-4M - Manual (Page 24)

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Replace the KXAT3 board as shown in Figure 17 or, if your KX3 is not equipped with the KXAT3
Antenna Tuner option, install the adapter board furnished in its place. Do not disturb the location of the
antenna coax you just positioned.
 There are two multi-pin connectors on the KXAT3 or on the adapter board. Be sure they are
properly mated with the corresponding connector(s) on the RF board below as shown in the figure.
 Reconnect the HF antenna cable. The two pins are tied together electrically so the connector may
be inserted with the pins oriented either way.
 Secure the KXAT3 or adapter board using the two M-F standoffs and lock-washers. Place the lock
washers under the standoffs as shown in Figure 18.
CAUTION
Tighten the M-F standoffs only enough to compress the lock washers. The standoffs
are aluminum and you can easily twist the threaded shaft off of the rest of the
standoff.
Figure 17. Replacing the KXAT3 ATU.
Figure 18. KXAT3 or Adapter Mounting Hardware.