Thanks for this. I've never really understood, why termination resisters were required.  You've explained in a way that is both objective and easy to process.

I have never understood reflections either in college or technician explaining to me and now I know what it is because your class were clear, objective and easy to me understand. CONGRATULATIONS, Thank you.

"That's one of the greatest videos I've ever seen. Anyone who wants to deep dive into High-Speed PCB design should watch this video and the one about measuring light speed. I truly admire the video creator's efforts to expand our knowledge."

I only ever work with 50ohm coax, but this explained everything to me that years of hearing it and working to make sure the impedance matched make sense. I’m going to watch a lot more of your videos. You should be a professor if you aren’t.

I am a retired EE.  I really like the way you explained the reflection polarity at the end of the line.  I never thought about it that way. Smith charts don't give you an intuitive understanding of what is going on. Thanks!

I've used 75 Ohm BNC cables for networking and then digital audio cumulatively for 40 years and never got an explanation of it. Thanks for the clear and well thought out video! I do feel its better to say that 'cable capacitence rounds off the square wave signal' rather than saying it 'messes things up'. Square wave is every harmonic of a sine wave so it makes sense that the tiny capacitence will filter the upper harmonics away. Great video though - thanks! :D

Excellent video! Been in the field for 40+ years and that is the BEST explanation I've seen for a neophyte.

Absolutely awesome demonstration on the importance of impedance matching! Not what I was expecting when I clicked on this video but I'm glad I did. Thank you and subbed :)

thank you, after decades of messing around with electronics, I finally get it.

This is the best explanation of characteristic impedance I've ever heard. Well done!

Very neat, now I understand the importance of terminating open ends of unused outputs with 75 Ohm terminal resistors!

That is brilliant: I now understand what I was doing for all those years cabling up the college where I worked with thinnet (50 ohm) coax cables! Thank you!

Finally, now i understand reflection in even other types of cable like RS485 networks. But also the whole 75 Ohm cable spec was unclear before. Thanks, this was a clear and complete explanation! Edit: Just fixed the Afri-English 😆

Good to see that no one understands or can explain 75 ohm cable rating. Not just me.

Thank you. Similarly to other ppl - I wished this was part of the explanation and demonstration I was given in my classes.

Excellent video in explaining the signal reflections. Thanks for the efforts taken for explicating it in such profound detail. You've just got another subscriber for your channel.

I have never, ever seen such a professional and at the same time easy explanation of something that seems complicated. After watching you draw and explain how it works, I subscribed immediately. I'm sure that when people were creating the Internet as a mass communication medium, this type of knowledge spread was their intent. Just wow, I have no words.

I was just measuring the resistance of controlNet cable and couldn't find the 75 Ohm  there! I thought I am measuring not correctly, so searched for how to properly measure resistance! And Your video came up! Thanks! You saved my day!

Such a good demonstration of transmission line theory and conservation of energy. They should use this example in EE undergrad courses!

I must say, after the (incredibly excellent) explanation of the reflections when open and shorted, and after the WONDERFUL direct practical demonstration of "Look, if we put a resistor at the other end that 'matches the rated impedance', the reflection disappears..."
When you then brought back the longer pulse and explained "The first bit is before the reflection, so we first only see the characteristic impedance as if the line were infinitely long"... I thought to myself, "This video is genius!"

Really love the super practical aspect of it! I've learned about the theory of transmission lines before, but it's amazing to see it so concretely demonstrated with real, simple, physical electric equipment like this.

Great work! Thank you for your clear explanations! ❤