FT8 - Description, Myths, and Operation

Very good and clear explanation on why more power does not
necessarily mean better signals, also how the correct use of RF gain and AGC
can improve your decodes. Great video.

QNC operations by Willem van Heerden ZS2WP

Operating QNC by Jess Clark ZS6JES

QNC Effectivenes ZS6KED

Impedance Matching 101