Elecraft K3EXREF - Manual (Page 8)

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Route the cable under the RF board and toward the front of the K3 as shown in Figure 4. Keep the cable
near the edge of the board as shown.
Figure 4. Routing the SMA Cable Under the RF Board.
Route the cable through the notch near the front of the RF board and up between the front panel shield and
the front panel board assembly. Bring the end of the cable up above the front panel shield behind the KREF3
board as shown in Figure 5.
Figure 5. Routing the SMA Cable Behind the Front Panel.