Elecraft PX3 Owner's Manual - Manual (Page 27)

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Setting up the PX3 and KX3 to use the PX3 Internal Calibration Signal
On the PX3, loosen the four knurled thumb screws and remove the bottom cover. Cut a length of insulated hook
wire about 12 inches (30 cm) long. About 20 or 22 gauge will fit nicely. Pass it through the side panel opening
in the PX3 and through opening in J103 as shown in Figure 19. Do not remove the insulation and do not push it
through so far the exposed conductors at the cut end might contact components inside the PX3.
You can leave the bottom cover off while doing the nulling procedure. It will not affect the results.
Figure 19. Calibrator Signal Pickup Wire Installed in the PX3.
Arrange the PX3 and KX3 as shown in Figure 20. Take care not to dislodge the pickup wire you installed in the
PX3.Capacitively couple signal from the pickup wire to the KX3 as shown. Use enough wire to vary the
capacitive coupling to the KX3 as needed by the nulling procedure.
Figure 20. Opposite Sideband Nulling Setup Using Internal Signal Source.