Elecraft KXB3080 User Manual
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Part III: Assemble and Install Low-Pass Filter LPF1
The LPF1 Low-Pass filter replaces L1 and L2 on the KX1 PCB. The completed and installed LPF1 is
shown in Figure 8. Follow the assembly procedure closely to ensure that the finished LPF1 fits as shown.
C1
K1
L1
L2
Ground Wire
Inductor Common Wire
White Wire from
KXB3080 Module
C9
Figure 8. LPF1 Installed.
Locate the LPF1 PCB and the 0.1 µF (104) capacitor C1.
Position C1’s leads through the holes in the LPF1 PCB as shown in Figure 9. The capacitor body
must be on the side of the PCB with the circular outlines for the toroids. Use your needle-nose pliers to
straighten the leads as needed so the capacitor sits as close to the PCB as the epoxy coating allows (see
Figure 8). The top of the capacitor must sit no more than 3/16” (5mm) above the PCB.
Inductor Common Wire
(Bare) Connects Here
Capacitor C1 Mounts in
Round Pads
L2
L1
4
4
2
2
3
3
C1
Capacitor and inductor common
wire are mounted on this side of
the PCB.
Toroid side of PCB
Figure 9. C1 and Inductor Common Wire Connections to LPF1.
Trim C1’s leads flush with the relay side of the PCB. They must not stick out of the pads.