Elecraft KXV3A - Manual (Page 12)

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Mount the KXV3A rear panel over the BNC connectors using two 4-40 1/2” (13mm) black pan head screws
through the corner holes with #4 inside tooth lock washers and 4-40 nuts on the inside as shown in Figure 10.
Do not fully tighten the nuts yet.
Figure 10. Mounting Hardware.
Adjust the depth the KXV3A board connector mates J66 on the RF board so the KXV3A connector panel
is parallel with the back panel. The pins on the KXV3A board connector do not go all the way into J66 as shown
in Figure 11.
Figure 11. Typical Connector Fit.
Tighten the screws and nuts holding the KXV3A to the back panel that you installed earlier (See Figure 10)