Amateur Extra Class Lesson 8.1, Digital Protocols and Modes

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!

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4 Responses to Amateur Extra Class Lesson 8.1, Digital Protocols and Modes

  1. L. Paul Ebert says:

    ms Culver. I did work in the US Navy in crypto so we did have protocols even back then. The use of all the different Protocols used today seem complex and harder to understand; So much for the digital world of today. My e-mail is

  2. dcasler says:

    You can get in touch with me via the Ask Dave page.

  3. Renee Culver says:

    You are the First ham to use the word “protocol”. Please send me ur email address,,,

  4. Leon (Paul) Ebert says:

    D..A..H scratching my head. I did work crypto repair/ crypto encoding/decoding in the USN with B2 tables and TTY’s but never got into the stuff your talking about. INTERESTING …. Thanks for the info. I’ll try to decipher this in my sleep…… HI…..HI 73

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