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Doug LeBlanc
เข้าร่วมเมื่อ 24 ม.ค. 2012
Science Videos
Antenna Theory Bandwidth
The National Film Board of Canada for the Canadian Air Forces - Great explanation of Bandwidth
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Antenna Theory Directivity
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The National Film Board of Canada for the Canadian Air Forces - Great explanation of Directivity
Antenna Theory Propagation
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The National Film Board of Canada for the Canadian Air Forces - Great explanation of Propagation
Hello sir We need more videos on the antennas📡
Man, the very best explanation, in years. Now I understand. Thank you!!!!
4:37 sytyttää tupakan 4:41 ensimmäinen uloshenkäys
I’m very grateful that you’ve uploaded these. They’ve helped me tremendously with my aviation theory exams.
"the traveling wave is in time phase and space qudrature" What does time phase mean in this context?
I got a john Belushi,"I see the light" moment when I saw how the shape of the antenna radiation comes about. What an eye opener! Each type of antenna has it's own foot print shape.😮
My hat is off to those animators, doing it way before we had easily generated computer graphics.
For this next 1x 40 minute period ...
Nobody needs this crap
Im still learning....it will make sence soon
@ 0:32 Brilliant in its simplicity, haha
Do I need to be licensed to translate to Spanish? I noticed that there is no text in the video, which made me think it would be an excellent pedagogical tool.
Please reach out to library-archives.canada.ca/eng/collection/basics/Pages/who-we-are.aspx
@@Bonkers01 Thank you for the advice!
@ 0:47 A STATIONARY POINT-SOURCE DOES NOT EMIT EM-RADIATON.
3 videos only!??!? With such high quality of education, we want more! ❤❤❤❤
Today's videos are just a pile of no use compared to this gem!
Just a basket of 💎💎💎💎💎💎💎💎
👍
Welp....time to get serious...
Still dont get why first the the E and H field are 90 degrees out of phase but suddenly they are in phase 😢
Yah i am thinking this also that they should be 90 our of phase
1:04 - it should be noted that this visual representation is not a sign wave form but momentary pulses as it does not fade in and out. Indeed, radiating from one point wouldn't have the dynamic of traveling along a radiating element, so that doesn't mean it is necessarily incorrect, just not representative.
1:43 While electrons do move it is not the electrons themselves that are moving this distance but rather their electrical field, similar you could say to how a wave travels across water though the actual specific molecules of water aren't traveling the full length of the wave's propagation.
👍
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Even grade 10 students will be able to understand from this video. Hat off 🙏🏻🙏🏻
What an amazing video. Such types of animated videos are really helpful to understand different concepts. Thank u so much
I was definitely thinking an episode of Tom and Jerry was about to start after that intro..
2:30 can we actually imagine it as squeezing electrons? Aren't they in similar distances all the time?
These type of videos explains the best. ❤
This video turned my life around.
Man, old dudes must use 100% mind power and 100% effort, creating such billiant people.
I am not as impressed by this film as most other viewers seem to be. There are two major shortcomings: First, the question of why the "pulsating" electric and magnetic near-fields around the dipole travel out into space is not addressed. Instead, at 5:10 they weirdly move the "field of view" away from the antenna and just claim that there is indeed propagation with E always being perpendicular to H (which, of course, is true, but for somebody without prior understanding of electrodynamics, is not evident why that should be at all) Second, when they "explain" reflection at surfaces, they simply state that the E-vector is instantaneously reversed, while the H-vector is not (8:06). For someone who is not an expert (and therefore the target audience of this movie) this seems completely arbitrary, and no explanation is given as to why. So yes, the film is good in parts, but unsatisfactory in others...
In this diagram animation BOTH the VOLTAGE and CURRENT (fields) are drawn as strongest in the middle of the antenna. As far as I know one of them should be stronger at the tips of the antenna and the other weak at the tips but strong at the feed points.
I think it depends on the wavelength relation of the antenna and where the feed point is. I recently saw a video that illustrated your exact point, but I'm trying to remember what was said. I found it by accident. I feel like it had to do with an end fed antenna, made at a fractional wavelength and showing why a center fed dipole is so desirable, but an end fed (while more practical in building and mounting) is a compromise electromagnetically. I think it was regarding building a 160m antenna. The guy was explaining the trade offs and difficulties in building such a long antenna for that band.
Bullshit!
O.k
My marriage was on the brink of collapse before this video cured my wife of wokeism. Thank you so much Canada
I love this, I knew this should be this ease unlike the way my lecturer thought us.
now all it needs is more title screens and dramatic music
Beautiful! Isn't it!
Thank you for Sharing!
Wow
Brilliant explanation of the basics - thank you.
I was born in '63. Good vintage.
impressive
another old jem
This is so intuitive I’m CONVINCED my EE degree was a total scam.
good stuff
I like how they say negative energy and it you flip the probes them it will be opposite
Lmao the intro was so grandiose
great explanation
That illustration is misleading at 5:00, the E field and H field are in phase, there’s no capacitance here right it is an ideal conductor
He says the peak happen in phase but the description at 5:00 implies they’re not…it’s as if the E and H aren’t maximized at same time in that illustration- which is wrong