Elecraft KX3-4M - Manual (Page 28)

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Figure 22. Mounting the KX3-2M or 4M Board in the KX3
If you have the KXAT3 installed, route the antenna coax to the KX3-2M or 4M board around the end
as shown in Figure 23. Be sure the coaxial cable does not pass over either of the nearby toroidal
inductors.
Figure 23. Routing the Antenna Coax Between the KXAT3 Inductors
Locate the notch on one side of the shield (see Figure 24). The notch is required to clear solder pads
on the KX3-2M or 4M board.