That is so cool! I've never seen RF power measured at different positions along a transmission line like that. I guess it's no surprise that it works, but it's always nice to see theory shown with an oscilloscope probe and a steady hand.
@MichaelOlsen-Engineer9 жыл бұрын
Brilliant demo and explanation. Thanks for sharing!
@fdutrey9 жыл бұрын
Applied Science Ben and Alan, you guys should meet up and do a video.
@w2aew9 жыл бұрын
Frédéric Dutrey I would *LOVE* that - too bad we're at opposite sides of the country!
@TheMrTape9 жыл бұрын
***** If only there was a means by which you could collaborate and share data in real time over long distances. I long for the day when that becomes reality.
@w2aew9 жыл бұрын
Yeah, maybe when someone figures out this inter web thingy ;-)
@softwarephil17097 ай бұрын
Outstanding demonstration of standing waves!
@Thesignalpath9 жыл бұрын
Thanks Allen. I remember when we did this experiments when I was an undergrad during one of my courses in the lab, I had a "WOW!" moment which changed my perspective forever. :)
@w2aew9 жыл бұрын
The Signal Path Blog Yes, there's nothing like "seeing" things like this - really makes it "click!" Thanks for the comment!
@EETechs9 жыл бұрын
***** Can you make a video explaining type 1 through 3 op amp compensation networks used for switch mode power supplies? Also, what does the "s" mean in (s+1) term in control theory for compensators and what does the H(s) function stand for?
@w2aew9 жыл бұрын
EETechs H(s) is the transfer function of the loop expressed using LaPlace transforms. This would be a more complicated topic and would likely have to encompass a few videos. I'll put it on the list though.
@bryceroberts5816 жыл бұрын
This video is the absolute gold standard for demonstrating standing waves. A wiki page is one thing, but seeing the RF power minima and maxima being measured on an actual transmission line is quite another. Fantastic work W2AEW! 73 de W6PGS.
@yurikvelo5 жыл бұрын
one more animated visualization from me (made in HFSS) for coax line ypylypenko.livejournal.com/42947.html
@MichaelLloyd9 жыл бұрын
You are very good at explaining somewhat hard to understand "things" in a way that makes them understandable. Thank you.
@bain58729 жыл бұрын
Michael Lloyd I agree. I've never saw anyone else do it as good as he does.
@ernieschatz37835 жыл бұрын
Your organized thought, visual aids and practical application is spot-on to me. So many You Tubers want to race through a subject without coming up for air. Also, you don't seem to have the tendency of diving down rabbit holes to the point where I feel I've been through a spin cycle! I rarely have to pause your videos either. I revisited this vid because memory is always the first thing to go!
@Parirash1234 жыл бұрын
Wow, I never thought that I'll ever witness RF Standing wave so practically.
@jmartin98652 жыл бұрын
This was fascinating. As a newish ham I never really got SWR until watching this. Thanks!!
@rameshbabu27043 жыл бұрын
Greetings from India, Alan you are my greatest RF guru
@hineko_7 жыл бұрын
I'm starting to think that utube is much better form of education than the universities. They never explained it this good at my U. In my case it was like here take this bunch of formulas, plug in numbers, calculate, congrats here's your bachelor's.
@w2aew7 жыл бұрын
You just have to find youtube instructors that explain things in a way that works for YOU! I'm glad that my videos do that for you.
@schwinn4345 жыл бұрын
Unfortunately, I wasn't a very good student (and that's my fault), but I do think Alan's videos are much more educational than any lectures I received in my EE baccalaureate degree program; my lab classes didn't even use real oscilloscope probes (and, I had no knowledge what additional influences a home-made probe would have introduced , when high frequencies were used in a circuit- besides, we didn't have the equipment to generate anything over 200 megahertz, anyway, if my memory serves me well). We just used coaxial cables, stripped to the conductor on one end, with a BNC connector on the other end. It's embarrassing for me to admit, how much basic electronic science I've learned from Alan's videos - that I should have already know from my formal education as a EE student. I sure hope my university does a better job today educating future engineers - but, I doubt they do, since I can't imagine the lab classes having expensive modern electronic test equipment in them (too expensive). It blows my mind to think of the money wasted in education, when they could just buy some decent test equipment, and pay the correct people to demonstrate how to properly use the test gear - and what the equipment is measuring, and why; And I do believe in the idea of public education, and consider myself to be very much a liberal. However, just today I was reading, in our local paper, about our local convention center receiving an education award for educating children middle school and high school children- not sure of the exact grades; this convention center puts on these very silly plays, which are supposed to be comical (I guess), for which they bus in thousands of kids to watch, during the school day, and call this science education. I started watching one of the plays concerning science, and it was a joke (truly a joke), IMHO.
@patrickbouldinkm5l1434 жыл бұрын
@@WECB640 I think Walter did a great job with the pendulum explanation.
@MichaelShaw_vk2hms2 жыл бұрын
This an excellent demonstration of VSWR. Thank you!
@grantgiesbrecht22366 жыл бұрын
Wow, I've never been able to see the effects of impedance matching as directly as you measured it here. It's very cool that you were able to measure the nodes and antinodes. Time to break out some PCBs and give it a try!
@paulp1204 Жыл бұрын
That was a terrific visualisation of an effect I understand, but had never witnessed so clearly. I've watched many of your fabulous videos, Alan, but this one has somehow eluded me. Glad to see it today. Thank you.
@jspencerg Жыл бұрын
Excellent practical demonstration of SW. I used to have students experience wave additions in the floor with 'super' slinkies. Similar wave behavior in different wave mediums makes understanding wave behavior so interesting.
@makerspace5334 ай бұрын
Nice demo. I have a large slotted line and an HP 415E I use to demonstrate SWR. If the crowd is very large, I hook a small amp and speaker to the amp output of the 415E so the 1000Hz tone can be heard around the room. I usually get some comments about the archaic equipment. Then I like to point out that this is the type of network analyzer that was used to design the equipment that brought back TV signals from the moon walks.
@wa9kzy3265 жыл бұрын
Fantastic presentation. Back in the day, we saw similar demos using "Letcher" wires. Nothing can be more informative than actually seeing the reality of the electric waves in their natural habitat, so to speak. Well done. In all of your videos, you have proven yourself to be a great teacher.
@daic72742 жыл бұрын
Best demonstration of standing waves so far, and a useful function of persistence on a digital scope. Thank you.
@SnowyTurtleXD Жыл бұрын
Great video! Really helped me in understanding transmission lines for a project I'm completing for my PhD. Much appreciated!
@DonzLockz2 жыл бұрын
Amazing to actually see it in action! TY
@octavmandru92194 жыл бұрын
You are a teacher that can do magic. Thank you for the effort you put in these teachings. Have you considered a teaching career?
@w2aew4 жыл бұрын
Maybe I'll teach after I retire...
@DenysSene7 жыл бұрын
really great way to explain SWR.
@RedlabsTV Жыл бұрын
Wow, your visualization methods help a lot to understand. Thank you!
@Impedancenetwork7 жыл бұрын
Ohhh man! That was awesome to see. I am literally learning about standing waves in my electromagnetics class right now. My brain started hurting so I stopped to watch some youtube. I just happen to type in standing waves and got this video. So nice to see what they are talking about in my EM book. All the equations and derivations just make you blind. This really helps me understand what is going on.
@RocketRoberts Жыл бұрын
So great to see someone who knows the material explaining it well!
@Avionics19589 жыл бұрын
I dont think any body can explain this any better and any clearer than you have Alain. You've nailed it.
@mattkarlgaard13109 жыл бұрын
Thanks for sharing! I watched this video with my 9 year old and it got him excited to break out his littlebits.
@rylanbrowne56583 жыл бұрын
You make it so much easier to understand transmission line theory. It's pretty hard to visualise it just by reading about it.
@borayurt667 жыл бұрын
Great video! SWR explained without getting drowned in formulas and theory etc. Loved every moment of it. Thanks!
@erikchen8897Ай бұрын
amazing, really helped me understand standing waves
@UberAlphaSirus9 жыл бұрын
I don't know how you do it. I could read for a week on all this voodoo magic, and you Sir, sum it all up in 10 minutes. Your channel is one of the best I have have subbed.
@moustaphamuhammad70136 жыл бұрын
Yes, yes exactly!
@insightfool2 жыл бұрын
This is such a great intuitive explanation of things. Thanks so much!
@cyberphox1 Жыл бұрын
That is an excellent video on standing waves.
@VintageLabSilvioPinheiro9 жыл бұрын
Genius again. The best video i saw about stand waves. Clear, direct and simple. Sorry about my rusty english. Huge 59 S9+40 73 DE pu2srz
@BMRStudio9 жыл бұрын
Best RF teacher on the planet!
@williamwalker8107 Жыл бұрын
I like this practical literal demonstration of SWR stuff.
@stpaulji9 жыл бұрын
Thumbs up! Great video to visualize standing waves on TML. The first time that I have seen such a kind of visualization.
@PapasDino9 жыл бұрын
As usual you make a complex topic so much easier to visualize in real life! 73 - Dino KL0S
@jmex469 жыл бұрын
Thank you for taking the time to demonstrate standing waves. Great work!
@KB9DKA3 жыл бұрын
Amazing demo on Standing waves. Actuall measurement of the standing wave pattern on the live transmission line is absolutely unique. Much appreciated W2AEW !
@martinhodge9215 жыл бұрын
In 10 minutes you've completely demystified standing waves for me. Thank you!
@damny0utoobe6 ай бұрын
Definitely booking marking this
@pentachronic5 жыл бұрын
Brilliant!! Never really understood this. Now I do !! You definitely have a gift for breaking apart the complex and showing us what is really going on.
@fjs11112 жыл бұрын
Awesome visualization of standing waves as well as a description of constructive/destructive wave interference.
@_egghead7 жыл бұрын
Thanks man. This does not only made me understand standing wave, but i now visualize the concept of transmission
@Aemilindore5 жыл бұрын
Thanks for letting me see this phenomena. Although yuur previous video spoke of it, it was tough to believe it. This video gives the edge. Thank you so much.
@acestudioscouk-Ace-G0ACE2 жыл бұрын
To be able to "see" practically what the text books teach, is just amazing. It really helps to take the information on board. Thanks. You have so much content, I'm working my way through. Watch one, think and absorb, watch another... I could be half educated by the end of this! LOL
@RohanSingh-py5cv6 жыл бұрын
So awesome!! I'm studying about Transmission Lines right now and it's so cool to actually see all the theory presented in the books!
@SteveTjiang3 жыл бұрын
Awesome video. The visualization really helped me understand SWR
@alucardt3hvampireguy5 жыл бұрын
I've had great trouble in the Electromagnetics course because while using Smith charts, we never went over what the transmission and reflection coefficients, nor the VSWR actually represented visually. Thanks so much for clearing this up.
@moustaphamuhammad70136 жыл бұрын
I can't stop watching that video over and over again. you are the master of desk experiment.
@RatedA4Aliens4 жыл бұрын
Simply the best, this should be the supplementary video material for any transmission / Power related EE course
@davidcasement12963 жыл бұрын
Nice Video. I clicked like and shared with some coworkers who are learning about this for FM Broadcast (Low power).
@yaghiyahbrenner89029 жыл бұрын
Fantastic video. so much knowledge compressed in only 10 mins.
@dank89812 жыл бұрын
This is really awesome. Really appreciate the demo.
@forestfolks6 жыл бұрын
Incredible! I've been struggling to understand SWR and this helped me a lot!
@ve6kk5 жыл бұрын
Thanks so much again Alan. I wish I had your vids and ideas for test fixtures when I was teaching Engg. Techs. Standing waves are one of the hardest ideas to grasp so I sent this link to my basic ham class. And so happy that the classic Similarities of Wave Behavior is on KZbin too. Cheers
@gerrysweeney6 жыл бұрын
Thanks Alan, every time I watch one of your vids I know more about RF theory, I really like your practical illustrations of this sort of thing.
@w2aew6 жыл бұрын
Thank you Gerry!
@TheStoneWhisperer2 жыл бұрын
Well I feel like an infant listening to their first words! OMG! Some cool stuff here! I understood about 50% of it, but I took what I could from your words of wisdom! Thanks!
@naftilos764 жыл бұрын
That is the coolest thing i have ever seen. Illustrating standing waves with this trick was just amazing. Great thinking! Bravo!
@LarsBerntzon9 жыл бұрын
Very nice and clear to see how it behaves
@nlo1146 жыл бұрын
Excellent demonstration. This would have been good at my tech-college. It took me ages to understand this straight off a blackboard, in a class of semi-interested students.
@sherwintiongson81974 жыл бұрын
This is a fantastic video.
@07kandarp7 жыл бұрын
Amazing video as always, I was having a discussion with a friend of mine as to why the normalized impedance would repeat itself on a transmission line every half wavelength. This proves it. Also that is true for any termination except matched termination aka 50 ohms in most cases. Sits really well with the smith chart also. Alan you are true genius.
@hubercats2 жыл бұрын
Another awesome demonstration, Alan. - Thank you! - Jim
@PeterWalkerHP16c4 жыл бұрын
In the '70s I saw a professor run a light bulb between two conductors energised with a WWII 10 cm radar unit and watched the bulb get brighter and dimmer as he traversed the length. Now I've seen the effect twice!! Cool!!
@WilliamLaakkonen9 жыл бұрын
Well done indeed- reminds me of the old HP slotted lines we used at Solitron Microwave. 73
@DucatiMTS12004 жыл бұрын
Magic explanation and demo!
@ekobbl20115 жыл бұрын
Best explanation and practical demonstration ever! 4 thumbs up.....
@jonka16 жыл бұрын
Beautifully and perfectly illustrated.
@gurgen_a7 жыл бұрын
Really good demonstration!
@radiofun2324 жыл бұрын
Perfect demo, 5 stars (cannot be explained better).
@davidausterman59153 жыл бұрын
Brilliant video
@dannybeckett012 жыл бұрын
Extremely good demo
@dd03565 жыл бұрын
I wish we had videos like these when they taught waves & antennas in college. All the test equipment were costly, we did not have time, and the teacher wasn't really interested because we could not visualize it! but it looks so cool :)
@hdmalpas9 жыл бұрын
Clever way to show VSWR, many thanks, from M3KQW. 73s
@CoversTavo2 жыл бұрын
Wow dude... Excellent explanation! :)
@EigenA4 жыл бұрын
Great job on bringing my Emag class to life. Thank you.
@ae68505 жыл бұрын
I've been following whenever; your way and material of explaining things is it. Thank you Sir. ae.
@CalebDiT7 жыл бұрын
Great video! It's so nice to see things come together in reality after studying this stuff on paper.
@lupojacobo98922 жыл бұрын
Thanks for sharing your knowledge
@wuftymerguftyguff2 ай бұрын
Thanks Allen, very useful
@JustSomeGuy19679 жыл бұрын
Your videos are always great. I'll be waiting for the next one !
@OscarJimenez-qo8go3 жыл бұрын
Fantastic video. Please continue making these informative videos on RF!
@alperenalperen24589 жыл бұрын
A very clever demonstration
@TheBdd45 жыл бұрын
Just saw saw this excellent video. I hope you are compensated in some way for all of your vauable videos! I have learned so much from you.
@larrywiniarski17462 жыл бұрын
Very very very very nice video. Thank you so much.
@sergiogarza89333 жыл бұрын
Phenomenal video, thank you so much.
@robertcalkjr.83259 жыл бұрын
Thanks Alan. Another great lesson.
@eddyane676 жыл бұрын
It was a shame I discovered this video today. I would have save a lot of questions. It´s great. Thanks
@EVERY.CIRCUIT10 ай бұрын
I like your video, thank you so much for this video😊
@psp100049 жыл бұрын
RF black magic, utterly fascinating.
@RafaelSouza-xq6vw9 жыл бұрын
One more great video, Alan. I did not read all comments, but perhaps the answer to your "sliding waveforms" question is: use a trigger source that is independent of any of the two channels shown (ext trigger, for example) and is only slightly different in frequency when compared to the other two waveforms. Also, the frequencies between the two channels are also slightly different but not perceptible. I think this would be enough to create the "travelling wave" effect in both directions, wouldn't it? Well, perhaps there is a simpler approach to it.
@w2aew9 жыл бұрын
Rafael Souza Yep - brownie points to you too. I made one slightly higher than the trigger frequency, and one slightly lower (by the same amount). Thus, when you summed them up, the result was stationary with respect to the trigger source.
@annacersongor85533 жыл бұрын
So beautiful ! Thanks sir, thanks a lot.
@RoboGenesHimanshuVerma2 жыл бұрын
So enjoyable and clean
@saarike4 жыл бұрын
Absolutely great!
@Resonant879 жыл бұрын
thank you so much for these videos you make understanding electricity sooo much easier.. you're doing amazing work
@DAVET389 жыл бұрын
Another very interesting video Alan. Thank you.
@isaacalejandroperezvazquez714310 ай бұрын
Excelente video, gracias por tu conocimiento
@rkdehury9 жыл бұрын
excellent . great way of explanation.
@bain58729 жыл бұрын
Very innovative way of showing this Alan. This is where you shine. You had once, awhile back, linked me to an older film produced by bell labs, I think. That film did a great job at flipping my light switch on this subject. You did an excellent job here as well however, your vid was not available then. The only down side of your videos is, I sometimes begin to think I know what I'm doing with RF.....that tends to be dangerous....LOL!
@w2aew9 жыл бұрын
bain5872 Yes, this is the video you were speaking about - totally brilliant! kzbin.info/www/bejne/eqDZpqGFrdGMZ80
@bain58729 жыл бұрын
***** Yes, that's the one. Both of you show the exact same concept but in different ways and I agree, both are brilliant, indeed! I think persons tend to see electrical waves as a mysterious electrical process that clouds their judgement. The thing that really put my feet on the ground is seeing, in both the AT&T film and your probing the open line with the detector, that it is a physical process taking place inside the conductor. I think this distinction is what was needed to grasp the subject, at least for me it was. Again, great job as always.