Here’s your video introduction to Section 8.1, “Digital Protocols and Modes,” in the ARRL Extra Class License Manual for Ham Radio.
When you have finished viewing the video, have studied the section, and are comfortable with the associated questions in the question pool, you can return to the list of videos for Amateur Extra Class by clicking here.
There is an error in the discussion of Frequency Hopping Spread Spectrum. The chart is correct, but the annotation chooses the wrong row of colors for the zero case. The correct row for the case of a one is the top row, and the correct row used in the case of a zero is the second row, not the third. The third row is actually the transmitted sequence. Sorry ’bout that!