Elecraft KX3-4M - Manual (Page 25)

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Installing the KX3-2M or 4M Board
Since attaching the coaxial connectors takes significant force, be careful not to damage the KX3-2M or 4M
board or any of the components on it when attaching the cables to it. The connectors for the antenna and
local oscillator coaxial cables are on the side of the board that faces downward toward the KX3 RF board
when it is installed, so the coaxial cables must be attached first. The locations of the coaxial connectors on
the KX3-2M or 4M board are shown in Figure 19. Note that the KX3-2M or 4M board has no components
directly behind the coaxial connectors. That allows you to place a solid object behind the PC board to
support it while pressing the coaxial cable connectors in place as described below.
CAUTION
Do not try to attach the coaxial cables without supporting the board to avoid stressing
the board or the components. The connectors will require as much force as you used
on the L.O. connector earlier. Failure to provide good support may destroy the KX3-
2M or 4M board.
Figure 19. KX3-2M or 4M Board Coaxial Connector Locations.