Elecraft KX3-4M - Manual (Page 26)

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Attach the coaxial cables to the KX3-2M or 4M board as follows:
Connect the local oscillator coaxial cable to the L.O. connector (J4) on the KX3-2M or 4M board
using a solid object to support the board from behind while you press the connector in place with a tool
such as a plastic pen just as you did before at L.O connector J4. Figure 20 shows a common pencil used to
support the board but any solid support that rests directly against the printed circuit board and not the
components on the board is suitable.
Figure 20. Attaching the Local Oscillator Cable to the KX3-2M or 4M Board.