# Amateur Extra Class Lesson 4.1: Radio Mathematics

Here’s your video introduction to Section 4.1 of the ARRL Extra Class License Manual for Ham Radio, which covers Radio Mathematics. This is our first deep dive into the technical material. I’ve tried to provide extra explanations to help. Please post a comment if you have questions or concerns.

After you have viewed this video, studied the material in the text, and ensured you understand all the answers to the appropriate questions in the question pool, you may return to the list of Amateur Extra videos by clicking here

I added some background music. Let me know what you think.

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### 8 Responses to Amateur Extra Class Lesson 4.1: Radio Mathematics

1. Dave says:

Hi Bob, your opinion of the background music seems universal. It was an experiment for that one video. I haven’t done it since!

2. Bob Vawter says:

Your videos are a wonderful aid to my study. I’ve seen them all since Tech. The background music is distracting to me. sorry….

3. Jon says:

Thanks for this great video. Even though I have a EE degree and studied these concepts many solar cycles ago, I found the ARRL book to be just QRM. Your simple and concise explanation of the relationship between complex coordinates and polar coordinates helped clear everything up.

Your style is somewhat similar to that used by Kahn Academy – https://www.khanacademy.org. Their videos provide excellent training in the majority of math skills needed for the HAM tests. My wife and I went from 1st to 8th grade math last year, taking all the tests, to understand what our grandchildren were being taught in schools today.

73 – KM4MNX

4. K1MGY says:

As usual, a well done offering. The efforts involved are clearly substantial and with a great intention. Thank you!

I find the background music somewhat distracting. I think it’s best at the intro and conclusion.

The material in this section came rather fast and furious. Had to pause the video to take it in. I think when offering principles it’s helpful to build upon examples in real practice.

Saying that we need to understand these topics because they are questions on the exam may be cause to pass this over and simply memorize the answers. However, I really want to better understand how these bits relate and therefore be more effective and useful in other areas of interest. I suggest that this topic could easily be the subject of at least two videos of the same length, with lots of practice examples from the test questions. Neither the ARRL manual nor this video brings me to a working understanding. But, I will keep plugging!

5. Bill Jones - AE7OX says:

Came across your site via Southgate’s site. Several of us are putting together a workshop to help people get prepared to take their Extra. I hope you don’t mind if we plagiarize some of your teaching techniques. You do an excellent job with all of your topics and I intend to point our participants to your material for subject matter reinforcement. Your videos are excellent! A can tell you’ve put a lot of work into them.

On a different note, I envy where you live and ride. I did the Durango to Ouray ride several years ago and it compares to anything I’ve ridden in the Alps. Beautiful country!

Yes, the music background adds to the viewing experience.

73

6. Guy Stevens says:

Nice way to get polar coordinates into peoples minds! That was a good set of examples.

7. pete clough says:

Still lost. Me and math just do not work. I guess I will have to attempt memorization. Or just miss these altogether.
WD 4 GPO

8. Tom Kolodz says:

Great presentation. I finally, at 73 years, understand sine, cosine and tangent. Keep them coming.

KC9MDN

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