Elecraft KPA3 Manual - Manual (Page 12)

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Place a black 4-40 3/8” (9.5 mm) flat head screw through the hole in the back panel and the tab at the top
edge of the shield as shown in Figure 8. Secure it with a #4 inside tooth lock washer and 4-40 nut.
Figure 8. Rear Shield Installed.
Tighten the three screws holding the bottom of the shield and the screw at the top on the back panel. Do not
over-tighten but be sure all four screws are tight. Don’t overlook one! Good contact is essential for the shield
to perform correctly.
Installing the KPAIO3 Interface Module
K3 KIT BUILDERS: Resume the installation with the following step.
Locate PA Jumper block mounted on RF board connectors P67A and P67B just inside the opening for the
fans. Unplug the Jumper Block. Put the Jumper Block in a safe place. You’ll need it if you want to operate the
K3 without the KPA3 module installed.
Figure 9. Removing PA Jumper Block.