TDT03: DC Pulses on Transmission Lines

[@xephyr417]

Dude you're really good! Excellent teaching style, excellent knowledge, excellent pace. 10/10 will recommend to friends.

[@nathanieltalker6532]

Shout out to Bill from Savana.

[@o.t.powell1142]

I'm a engineering student who came from Michigan State University. I now reside in Florida and I am in the electrical engineering (technology) program now. I value your videos greatly! Thank you Greg, you are a talented teacher. Wow you really know how to intro, get the students interested, and then explain things to them in a down to earth manner. Keep the videos coming if you can.

[@paulofarias3912]

Thank you, you deserve a medal professor!

[@robertjohnson4089]

Dear Mr Durgin I have been retired a while now and I like to relearn lean all the things i never understood i did enjoy your Class. I professor of mine once said going to school is like asking for a drink of wather and they turn on a fire hose on you.

[@johanburger6109]

This guy thinks like me, how refreshing. Definitely subscribing. This answered a lot of my questions on the fundamental level

[@hvincent1106]

Holy....now I know how does an excellent lecture sounds like~!

[@MahmoudGamal-io3hl]

That cleared up many of my confusions about the theory. Great video from a great professor! Thanks!

[@alexscarbro796]

A great lecture Greg. A really useful refresher for even seasoned engineers! Please say hello to Lamar G. (if he's still with GTRI). I worked along side him & Mike for a couple of weeks back in 2005 flight testing a C-Band collision avoidance radar . Happy memories!

[@m.arifhakimi2173]

just perfect!

[@ianyappy]

52:00 is there reflection at the interface b/w the voltage source and the transmission line when the voltage gets switched on?

[@yougoog1]

I would ask this same question as the reason I watch this video is I would like to know the detailed transient picture about how charges start to move from the source to rest of the system when the switch gets closed. If the connection wire between the source and the transmission line is very short compared to the distance associated with the frequency bandwidth of the pulse signal, then the reflection is insignificant because before the reflection could ever occur lot of charges would get to the interface from the source and establish the voltage at the interface in such a fast manner that makes the circuit system to the left of the interface exactly behaves like a DC system, so there is no reflection. Of course, there would be some extremely short time period during which the voltage at the interface changes from zero to its final stabilized value, but the transient behavior of the voltage may be too complicated to be described by signal reflection. Luckily, the the time duration is so short, we may just start our life from the time when the the voltage gets stabilized at the interface and pretend no thing ever happened there as long as the transient voltage at the interface did not cause any harm to the system. Engineering is all about approximation and makes life easy.

[@tohopes]

1:04:29 That gritty sound starts, and I can't tell whether there's construction going on, or this lecture has a heavy-metal soundtrack.

[@dinleepound9466]

Great thanks, professor! But, at around 31:20, the special case of GAMMA = -1, i.e. R_L = 0, should it be the case of a short circuit instead of an open circuit?

[@danielindictor4272]

Not the professor, but my textbook says you're right. An open circuit has GAMMA = +1.

[@dinleepound9466]

@@danielindictor4272 Thanks for checking it out!

[@austinmw89]

Great TL videos! Do you have any on rectangular waveguides and TE vs TM modes?

[@nathanieltalker6532]

+Austin Welch hey any answer about TE TM modes

[@nathanieltalker6532]

at 1:00:30 is'nt V- - a V++? because the propogating wave is symbolized with a p;us sign

[@jacobvandijk6525]

Love it!

[@smallmimibigmimi]

If you use the sum of a infinite geometric series to solve the worked example at the end (43:03 onwards), you get 4.091V. bout you show the answer is 4.55V. I am not sure I understand why they are different... V_Total=V_in/(1-reflection_1*reflection_2)= 5 / ( 1 - ( -2/3 * 1/3 ) )= 4.091V.

[@lorenzodavidsartormaurino413]

I worked it out too and I get his answer. Remember that there are two geometric series, one for each side of the transmission line. Also if you think about the result he got it makes total sense, in the long run the transmission line acts like a cable so the voltage on the transmission line should be 5V * (100/110) = 4.54545454 which is what he got.

[@ManojYadav-kc5fp]

Very very thank you sir

[@isjoker22]

10:30 I didn't realize capital was three words, lol. Great videos though, I wish you were teaching 3025 this fall. I watch these before I go to my Emag class so it's not like taking a drink from a fire hose.

[@Shai_1]

thanks alot prof. and btw, do you have any worksheets with solutions?

[@priyanshumishra1569]

Amazing

[@mattdistad]

the camera must be near a trasmission line, cause I hear some 60Hz hum

[@cmuller1441]

At 21:15 it's ... -V-/Z0... In the denominator

[@youcefyahiaoui1465]

Actually, t>T for the reflected parts to turn on.... The instructor was pointing to the incident wave... Just a slight mistake...

[@dusticopier]

Thank goodness there is at least one native English speaking EE teacher out there. Makes me want to transfer to Georgia Tech.

[@rogeronslow1498]

Most of them are probably in industry trying to make money.

[@RandyLott]

When trying to gain a better model, do you have to consider current density?

[@BluntForceTrauma666]

Ironic to hear that strong 60Hz background hum in a video of this type, huh?

[@bigfoottoo2841]

It's been 50 years since I studied this stuff, my brain is much slower now. 😑

[@kwgm8578]

Meetoo! Trying to rebuild old traces in the brain. And we already passed the tests! For instance, when he finally finished the equation for his Tx line and reflection, I realized that I knew we needed 2T to finish the formula. My professor at SFSU so many years ago took 2 minutes to get to a reflection wave and then went on to impedance matching. Now in 1971, we didn't think much of that guy as a teacher. He was the department chair and had been teaching too long. Of course, he was younger than them I am now!

[@8754484388]

awesome (y)

[@TheDavidlloydjones]

This guy is really unusual. He says "Let's get started" at the start. This is very unusual. Doesn't he know the Internet Rule? You're supposed to blather for twenty minutes, then say "Without further ado, let's get started," then blather for another ten. After that you do the introduction. Sheesh, get with the program Durgin.

[@veronicanoordzee6440]

You've been watching the wrong videos.

[@igorbecker6192]

excellent classes, but this video needs to remove the humming

[@robbowman8770]

Mains hum! Transmission line issues? Oops.