This video shows how to install the Elecraft KXFL3 Roofing Filter in the KX3 transceiver. It shows the physical installation along with the software alignment / sideband nulling process.
Elecraft KX3:
https://elecraft.com/products/kx3-all-mode-160-6-m-transceiver
Roofing Filter kit:
https://elecraft.com/products/kxfl3-dual-roofing-filter-for-the-kx3?variant=50783314699
/>Definition of a roofing filter:
https://en.wikipedia.org/wiki/Roofing_filter
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