Elecraft KBPF3 - Manual (Page 15)

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Hold the top cover above the K3, route the speaker wire under the stiffener bar and plug it into P25 on the
KIO3 board at the left rear of the K3 as shown in Figure 14.
Figure 14. Connecting Speaker Cable.
Position the top cover on the K3. Note that the tab on the back center goes under the rear lip of the K3 rear
panel. Secure the top cover with the nine 4-40 3/16” (4.8 mm) black flat head screws you removed earlier.
Enable the KBPF3 Module
Enable the KBPF3 for either the main or subreceiver using the CONF IG menu as described in the Owner’s
Manual. The KBPF3 will not operate until this is done!
This completes the installation of the KBPF3 module(s) in your K3 transceiver.