Тёмный

#208 

w2aew
Подписаться 206 тыс.
Просмотров 126 тыс.
50% 1

This video illustrates how RF (radio frequency) standing waves are created in transmission lines - through the addition of the forward (transmitted) wave and the reflected wave that results from improperly terminating the line or matching the load or antenna to the transmission line impedance. I have done several videos that relate to transmission lines, terminations and reflections - all of which tell a piece of the story. This video is another piece, and I hope it helps you to understand how standing waves are formed and what the "look" like. This wikipedia link has some great graphics (shown in my video):
en.wikipedia.org/wiki/Standin...
Here's my video on transmission lines and terminations:
• #143: Transmission Lin...
Measuring the length and impedance of coax:
• #37: Use a scope to me...
How a directional coupler works:
• #196: How a Directiona...
Measure velocity factor of coax:
• #162: How to measure c...
RF Detector Probe used in this video:
• #161: Circuit Fun: a s...
Brilliant mechanical explanation and demonstration of wave propagation and reflections, courtesy of Bell Labs:
• AT&T Archives: Similia...
...and if you read this far, here's a challenge...
Brownie points to you if you can tell me how I created the "sliding" waveforms and displayed the static standing wave in the first half of the video.
Update: This video got posted on Hackaday!
hackaday.com/2015/08/06/visual...

Наука

Опубликовано:

 

1 июл 2024

Поделиться:

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист
Посмотреть позже
Комментарии : 368   
@AppliedScience
@AppliedScience 9 лет назад
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-Engineer
@MichaelOlsen-Engineer 9 лет назад
Brilliant demo and explanation. Thanks for sharing!
@fdutrey
@fdutrey 9 лет назад
Applied Science Ben and Alan, you guys should meet up and do a video.
@w2aew
@w2aew 9 лет назад
Frédéric Dutrey I would *LOVE* that - too bad we're at opposite sides of the country!
@TheMrTape
@TheMrTape 9 лет назад
***** 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.
@w2aew
@w2aew 9 лет назад
Yeah, maybe when someone figures out this inter web thingy ;-)
@softwarephil1709
@softwarephil1709 5 месяцев назад
Outstanding demonstration of standing waves!
@Thesignalpath
@Thesignalpath 9 лет назад
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. :)
@w2aew
@w2aew 9 лет назад
The Signal Path Blog Yes, there's nothing like "seeing" things like this - really makes it "click!" Thanks for the comment!
@EETechs
@EETechs 9 лет назад
***** 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?
@w2aew
@w2aew 9 лет назад
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.
@williamwalker8107
@williamwalker8107 Год назад
I like this practical literal demonstration of SWR stuff.
@rameshbabu2704
@rameshbabu2704 3 года назад
Greetings from India, Alan you are my greatest RF guru
@Parirash123
@Parirash123 4 года назад
Wow, I never thought that I'll ever witness RF Standing wave so practically.
@bryceroberts581
@bryceroberts581 6 лет назад
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.
@yurikvelo
@yurikvelo 5 лет назад
one more animated visualization from me (made in HFSS) for coax line ypylypenko.livejournal.com/42947.html
@makerspace533
@makerspace533 2 месяца назад
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.
@MichaelLloyd
@MichaelLloyd 9 лет назад
You are very good at explaining somewhat hard to understand "things" in a way that makes them understandable. Thank you.
@bain5872
@bain5872 9 лет назад
Michael Lloyd I agree. I've never saw anyone else do it as good as he does.
@ernieschatz3783
@ernieschatz3783 5 лет назад
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!
@jmartin9865
@jmartin9865 2 года назад
This was fascinating. As a newish ham I never really got SWR until watching this. Thanks!!
@hineko_
@hineko_ 7 лет назад
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.
@w2aew
@w2aew 7 лет назад
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.
@schwinn434
@schwinn434 5 лет назад
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.
@patrickbouldinkm5l143
@patrickbouldinkm5l143 4 года назад
@@WECB640 I think Walter did a great job with the pendulum explanation.
@octavmandru9219
@octavmandru9219 4 года назад
You are a teacher that can do magic. Thank you for the effort you put in these teachings. Have you considered a teaching career?
@w2aew
@w2aew 4 года назад
Maybe I'll teach after I retire...
@jonka1
@jonka1 6 лет назад
Beautifully and perfectly illustrated.
@JustSomeGuy1967
@JustSomeGuy1967 9 лет назад
Your videos are always great. I'll be waiting for the next one !
@jmex46
@jmex46 9 лет назад
Thank you for taking the time to demonstrate standing waves. Great work!
@hubercats
@hubercats 2 года назад
Another awesome demonstration, Alan. - Thank you! - Jim
@paulp1204
@paulp1204 Год назад
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.
@insightfool
@insightfool 2 года назад
This is such a great intuitive explanation of things. Thanks so much!
@dank8981
@dank8981 2 года назад
This is really awesome. Really appreciate the demo.
@yaghiyahbrenner8902
@yaghiyahbrenner8902 9 лет назад
Fantastic video. so much knowledge compressed in only 10 mins.
@jspencerg
@jspencerg Год назад
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.
@RedlabsTV
@RedlabsTV Год назад
Wow, your visualization methods help a lot to understand. Thank you!
@Aemilindore
@Aemilindore 5 лет назад
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.
@bundangstluca
@bundangstluca 9 лет назад
Thumbs up! Great video to visualize standing waves on TML. The first time that I have seen such a kind of visualization.
@OscarJimenez-qo8go
@OscarJimenez-qo8go 3 года назад
Fantastic video. Please continue making these informative videos on RF!
@MichaelShaw_vk2hms
@MichaelShaw_vk2hms 2 года назад
This an excellent demonstration of VSWR. Thank you!
@grantgiesbrecht2236
@grantgiesbrecht2236 6 лет назад
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!
@CalebDiT
@CalebDiT 7 лет назад
Great video! It's so nice to see things come together in reality after studying this stuff on paper.
@fjs1111
@fjs1111 2 года назад
Awesome visualization of standing waves as well as a description of constructive/destructive wave interference.
@ve6kk
@ve6kk 5 лет назад
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 RU-vid too. Cheers
@forestfolks
@forestfolks 6 лет назад
Incredible! I've been struggling to understand SWR and this helped me a lot!
@ekobbl2011
@ekobbl2011 5 лет назад
Best explanation and practical demonstration ever! 4 thumbs up.....
@naftilos76
@naftilos76 3 года назад
That is the coolest thing i have ever seen. Illustrating standing waves with this trick was just amazing. Great thinking! Bravo!
@borayurt66
@borayurt66 7 лет назад
Great video! SWR explained without getting drowned in formulas and theory etc. Loved every moment of it. Thanks!
@_egghead
@_egghead 6 лет назад
Thanks man. This does not only made me understand standing wave, but i now visualize the concept of transmission
@RatedA4Aliens
@RatedA4Aliens 4 года назад
Simply the best, this should be the supplementary video material for any transmission / Power related EE course
@DonzLockz
@DonzLockz Год назад
Amazing to actually see it in action! TY
@martinhodge921
@martinhodge921 4 года назад
In 10 minutes you've completely demystified standing waves for me. Thank you!
@daic7274
@daic7274 2 года назад
Best demonstration of standing waves so far, and a useful function of persistence on a digital scope. Thank you.
@KB9DKA
@KB9DKA 3 года назад
Amazing demo on Standing waves. Actuall measurement of the standing wave pattern on the live transmission line is absolutely unique. Much appreciated W2AEW !
@wa9kzy326
@wa9kzy326 5 лет назад
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.
@RohanSingh-py5cv
@RohanSingh-py5cv 6 лет назад
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!
@PapasDino
@PapasDino 9 лет назад
As usual you make a complex topic so much easier to visualize in real life! 73 - Dino KL0S
@RocketRoberts
@RocketRoberts 9 месяцев назад
So great to see someone who knows the material explaining it well!
@pentachronic
@pentachronic 5 лет назад
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.
@TheBdd4
@TheBdd4 5 лет назад
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.
@BMRStudio
@BMRStudio 9 лет назад
Best RF teacher on the planet!
@SteveTjiang
@SteveTjiang 3 года назад
Awesome video. The visualization really helped me understand SWR
@SnowyTurtleXD
@SnowyTurtleXD Год назад
Great video! Really helped me in understanding transmission lines for a project I'm completing for my PhD. Much appreciated!
@Avionics1958
@Avionics1958 9 лет назад
I dont think any body can explain this any better and any clearer than you have Alain. You've nailed it.
@cyberphox1
@cyberphox1 11 месяцев назад
That is an excellent video on standing waves.
@gerrysweeney
@gerrysweeney 6 лет назад
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.
@w2aew
@w2aew 6 лет назад
Thank you Gerry!
@DAVET38
@DAVET38 9 лет назад
Another very interesting video Alan. Thank you.
@mattkarlgaard1310
@mattkarlgaard1310 9 лет назад
Thanks for sharing! I watched this video with my 9 year old and it got him excited to break out his littlebits.
@DucatiMTS1200
@DucatiMTS1200 4 года назад
Magic explanation and demo!
@rylanbrowne5658
@rylanbrowne5658 3 года назад
You make it so much easier to understand transmission line theory. It's pretty hard to visualise it just by reading about it.
@alperenalperen2458
@alperenalperen2458 8 лет назад
A very clever demonstration
@ae6850
@ae6850 5 лет назад
I've been following whenever; your way and material of explaining things is it. Thank you Sir. ae.
@gurgen_a
@gurgen_a 6 лет назад
Really good demonstration!
@robertcalkjr.8325
@robertcalkjr.8325 9 лет назад
Thanks Alan. Another great lesson.
@07kandarp
@07kandarp 6 лет назад
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.
@EigenA
@EigenA 4 года назад
Great job on bringing my Emag class to life. Thank you.
@karlfell3768
@karlfell3768 9 лет назад
Another fantastic and informative video. Keep them coming. Karl
@Resonant87
@Resonant87 8 лет назад
thank you so much for these videos you make understanding electricity sooo much easier.. you're doing amazing work
@sherwintiongson8197
@sherwintiongson8197 4 года назад
This is a fantastic video.
@acestudioscouk-Ace-G0ACE
@acestudioscouk-Ace-G0ACE 2 года назад
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
@davidgmos
@davidgmos 8 лет назад
Great demostration!
@UberAlphaSirus
@UberAlphaSirus 9 лет назад
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.
@moustaphamuhammad7013
@moustaphamuhammad7013 5 лет назад
Yes, yes exactly!
@Impedancenetwork
@Impedancenetwork 7 лет назад
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.
@TheStoneWhisperer
@TheStoneWhisperer 2 года назад
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!
@LarsBerntzon
@LarsBerntzon 9 лет назад
Very nice and clear to see how it behaves
@dannybeckett01
@dannybeckett01 2 года назад
Extremely good demo
@DenysSene
@DenysSene 7 лет назад
really great way to explain SWR.
@alucardt3hvampireguy
@alucardt3hvampireguy 5 лет назад
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.
@andrewlamoureux2251
@andrewlamoureux2251 7 лет назад
Great demonstration!
@davidcasement1296
@davidcasement1296 3 года назад
Nice Video. I clicked like and shared with some coworkers who are learning about this for FM Broadcast (Low power).
@sergiogarza8933
@sergiogarza8933 3 года назад
Phenomenal video, thank you so much.
@RoboGenesHimanshuVerma
@RoboGenesHimanshuVerma 2 года назад
So enjoyable and clean
@VintageLabSilvioPinheiro
@VintageLabSilvioPinheiro 9 лет назад
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
@tank618
@tank618 7 лет назад
Excellently done!
@davidausterman5915
@davidausterman5915 3 года назад
Brilliant video
@CoversTavo
@CoversTavo 2 года назад
Wow dude... Excellent explanation! :)
@radiofun232
@radiofun232 4 года назад
Perfect demo, 5 stars (cannot be explained better).
@yoramstein
@yoramstein 8 лет назад
Another great video .
@larrywiniarski1746
@larrywiniarski1746 2 года назад
Very very very very nice video. Thank you so much.
@saarike
@saarike 4 года назад
Absolutely great!
@annacersongor8553
@annacersongor8553 3 года назад
So beautiful ! Thanks sir, thanks a lot.
@lupojacobo9892
@lupojacobo9892 2 года назад
Thanks for sharing your knowledge
@bgroisma
@bgroisma 3 года назад
very clear and didactic video, congrats !
@kevinobrien8803
@kevinobrien8803 9 лет назад
Fantastic video
@rkdehury
@rkdehury 9 лет назад
excellent . great way of explanation.
@WilliamLaakkonen
@WilliamLaakkonen 9 лет назад
Well done indeed- reminds me of the old HP slotted lines we used at Solitron Microwave. 73
@damny0utoobe
@damny0utoobe 4 месяца назад
Definitely booking marking this
@FuZhixiang
@FuZhixiang 7 лет назад
Interesting and intuitive!
@kieranj67
@kieranj67 5 лет назад
Thank you for this excellent video
@wuftymerguftyguff
@wuftymerguftyguff 12 дней назад
Thanks Allen, very useful
@nlo114
@nlo114 6 лет назад
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.
@dougpeterson1925
@dougpeterson1925 9 лет назад
Great video.
@robv3872
@robv3872 3 года назад
amazing channel!
Далее
Tektronix - Transmission Lines
22:51
Просмотров 85 тыс.
Understanding VSWR and Return Loss
10:10
Просмотров 250 тыс.
Standing Wave Demo: Slinky
3:39
Просмотров 1,3 млн
Magnetic Loop Antenna Current and Voltage Distribution
6:05
Radio Direction Finding: AKA How "They" Can Find You
34:32
Самый СТРАННЫЙ смартфон!
0:57
Просмотров 36 тыс.
Gizli Apple Watch Özelliği😱
0:14
Просмотров 4,9 млн
Best mobile of all time💥🗿 [Troll Face]
0:24
Просмотров 1,5 млн