Elecraft KX3-4M - Manual (Page 27)

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Connect the antenna coax to the ANT connector (J3) on the KX3-2M or 4M board as shown in
Figure 21.
Figure 21. Attaching the Antenna Coax to the KX3-2M or 4M Board.
Install the KX3-2M or 4M board in the KX3 as follows:
Mount the KX3-2M or 4M board on the KXAT3 Antenna Tuner board or, if no antenna tuner, the
adapter board you installed earlier:
 Orient the board as shown in Figure 22.
 There are two multi-pin connectors that mate with connectors on the KXAT3 (or adapter) board.
Be sure all the pins engage.
 Secure the KX3-2M or 4M board with three screws as shown in Figure 22. Use the stainless steel
5/16” (7.9 mm) pan head screws provided, not the black 3/16” (4.8 mm) pan head screws that were
originally used to hold the KXAT3 board.
CAUTION
Be certain you install the black flat head screw that threads into the transistor heat
sink. Failure to install this screw will cause the KX3-2M or 4M to shut down after a
very short period of operation due to excessive heating of the final transistor.
Tuck the local oscillator coax into the space between the heat sink and the battery holders..