Radio Wave Properties: Electric and Magnetic Dipole Antennae

[@fairnut6418]

I don't know how to express how much I respect these demonstrations of principles which mostly consist of "theory that just works". Great work.

[@spqa2004]

Do what he did: Make a video that shows your thankfulness! Maybe sing a song! :-)

[@r.e.m2676]

If my grade school teachers had demonstrated stuff like this, I would have had much more interest in science.

[@Ebap-dy9zp]

That’s why we’re life long learners in our interests my friend, you can’t expect another human being to have their best interest for solely for you or their surroundings. In my not so brilliant understanding 🤕this short life for humans consists of just time and energy and which way we chose to utilize it, is to each their own

[@Wtfinc]

@@Ebap-dy9zpyeah but when we were kids we expected it because its what we were told. I get what ur saying but it only works once u realize everyone has been full of shit this whole time.

[@billfargo9616]

Your grade school teachers got their science from the textbook.

[@r.e.m2676]

@@billfargo9616 and the Bible. Three conflicting ideologies will always create more problems than solutions

[@Wtfinc]

@@billfargo9616 yup

[@ChrisConner1]

As a Ham operator, that was not just interesting, but hugely informative to help me picture what goes on on an antenna. And just cool science. Thanks very much!

[@VoCodebcv]

Even though one knows the theory, actually seeing the field properties is so informative, real world.

[@TRLTheRandomLab]

This would be a great video to show to prospective ham operators in a Technician license course.

[@OpSic66]

Absolutely. The part at 3:00 where he is effectively speaking about antenna polarization, would be very helpful for newer people into Radio. It's a visible version of what db drop looks like when you're running incorrect polarization.

[@nz0z134]

Yeah, here new hams operate an unlicensed transmitter at 100 watts to play with light bulbs. Whilst you're at it, get a 100 watt amp for your 11 meter rig.

[@ahmetmutlu348]

this had to be shown to anyone in past decades using analog tvs who were tryinh to adjust their tv antennas :P

[@gentlebear21713]

He didn't show his facility. Maybe he is inside a Faraday cage to prevent unwanted transmission. I mean really, 100 Watts? How does he get away with that without having the FCC on his ass?

[@JohnnyClavin]

@@ahmetmutlu348 Some of us still adjust our TV antennas.

[@henrikalr7876]

As a NCO Signaler in the danish army, this will help me out in ways you cant understand, with learning the new signalers about signals.

[@antoineroquentin2297]

Impressive demonstration. Safety distance of 100W 300 MHz into a dipole would be about 4 meters in my country (28 V/m E-field strength limit)

[@woodybollox]

Or about a mile in the UK.

[@uploadJ]

He's wearing a mask, so its "okay". (Obviously this is 'sarc'.)

[@antoniobragancamartins3165]

As an RF specialist i liked too much this video! Very didactic!

[@robpinter5431]

I visited a high power transmit station, the fluorescent light fixtures were fitted in the room but never wired up to mains power, but they had a nice glow just like this demonstration.

[@hideakipage8151]

Even if you know this stuff it's a beautiful demonstration.

[@AxelWerner]

It's one thing to read about it from some book, but something much more digestable and intuitive to experience it in person using such simple tools!! More and even lower grade schools should show stuff like that!!!! So THANK YOU VERY MUCH! 73 !

[@benmcreynolds8581]

It's really facinating how so many properties with-in Nature exist in waves, frequencies, and vibration, which converts into energy. Also differences seem to be a key factor in keeping dynamic systems functioning. High pressure/low pressure, hot/cold temp, different densities, static electric charges/discharges, electromagnetism north/south poles, different velocity/angular momentum, layers between different regions like land, water, air, edge of atmosphere, in space the regions of particle bubbles/cloud regions, nebula's/ Galaxy clusters/to less dense regions of space. All of these things are basic differences but create a way for the dynamic engine with-in Nature to continue flowing and operating to create and convert energy. Like regions of high/low pressure and temperature differences create winds. Transfer that into water or planets core and add density. It creates either ocean currents and flow or planetary convection geothermal activity.

[@das250250]

In fact if you move at speed to that difference the effect disappears. All exchange of energy can only occur between non identical dynamic oscillations.( waves )

[@MR-backup]

@@das250250But who, or what can actually move at those speeds?

[@das250250]

@@MR-backup it is all relative but other particles may be moving quickly like muons .

[@MR-backup]

@@das250250It can't "all be relative" if you follow up by saying there is SOMETHING "moving quickly". Either way, aren't you just confirming the OP?

[@das250250]

@@MR-backup Not sure what you are asking "op" ? My statement says there is only relative motion and possibly values. As per relativity.

[@nooneyouknow9399]

As an AM broadcast engineer, I used to have visitors carry a 4' fluorescent lamp to "help me" and walk them past the tower. A lot of broken lamps in the gravel over the years.

[@fifaham]

Brilliant presentation. This explains theory of Maxwell Equations in practical way.

[@GeyzsonKristoffer]

Isn't it scary that only about 6k people watch this yet prank videos get millions?

[@ابوكيان-م2ض8س]

Exactly this is what I was thinking about. I was only surprised by 6000 viewers in this video. Really, this proves what people reached😔😔

[@squarerootof2]

Now that scientists have become a joke and a laughing stock they'll get more views, I'm sure. The dumb masses just love these cosplaying clowns and the pranks people like Fauci play on them.

[@robertlangley258]

Yes one is interesting and funny and the other is boring and of no use to me. I leave it to the people that want to know about this to enjoy, but don’t judge me butthole.

[@thomasmaughan4798]

"Isn't it scary" Yes, it isn't scary.

[@moegamatnazeer8241]

It's because small things amuse small minds..

[@jalaltabasinejad1404]

I appreciate your experiment. On demonstration of B-field, in fact 2 loops perpendicular to each other exist, the small loop is the connection of the light bulb. The small loop could get the B-field. In near field probe applications, we always use small loop sniffers perpendicular to the wire.

[@RGMadu]

10 years ago I saw a identical video from Harvard, I think was this same lab and transmitter, but there was a water tank and he submersed a smaller antenna that lit a bulb only inside the tank, showing that the magnetic field changes in wavelength when traveling inside different densities, so the bulb did not lit outside the tank because the antenna was so small tho the wavelength of the air.

[@wolfgangrueckner7151]

I think you're referring to this write-up on the experiment (scroll down towards the end); sciencedemonstrations.fas.harvard.edu/presentations/radio-wave-properties

[@RGMadu]

@@wolfgangrueckner7151 Wow! That's it! I read the entire page at that time... so it was not a video! My mind tricked me! Thanks to show me the page!

[@DumbledoreMcCracken]

That loop still blows my mind

[@Greg_Chase]

We experiment with Lorentz force RF antennas. The physical field manifestation is interesting. Here is one setup: 1) 10 layers of store-bought aluminum foil, each layer separated by a dielectric layer (basically a 10-layer lamination). The lamination is horizontally oriented on the workbench 2) very strong vertically-oriented B-field applied to the axis (center) of the lamination 3) roughly 16 Mhz fed to eddy current coils positioned radially, and adjacent to, but not touching, the foil lamination With a vertical B field through the centerpoint, and radial eddy currents flowing horizontally through the metal layers, the Lorentz force sweeps the charged particles in the metal layers back and forth, coherently, at the 16 Mhz rate. Since artificial gravity can be created by immense coherent accelerations present in the bulk of a sample, we use variations of this design to check for such effects.

[@Gerard423653]

No need for 100W. I did the same when I was a eenager experimenting with approx. 8-10W @100 MHz, (with QQE03/12 tube, parts from old tube radios and TV’s and a standard FM radio dipole, Then dimming the light by varying the power. Once light up one could walk pretty far away with the tube. It convinced my parents I could do magic. :-) This brought back the memory of those fun times.

[@NatSciDemos]

Correct, 100W of output would easily burn out the type 47 (1W) incandescent bulb in the receiving dipole at 1 meter distance, which is why we use the minimum amplitude setting on the HP oscillator. Thanks for watching.

[@TheTarrMan]

This was absolutely fascinating. Thank you so much for demonstrating this.

[@chrispteemagician]

I was waiting for him to say “Induction Loop” and “Horizontal Polarisation” , otherwise a very visual representation, thanks.

[@rohitjoshi7811]

wow, never thought antenna would be this simple

[@Strider896]

Very nice demonstration！ THank you sir！It helps a ton to have a better understanding of the electromagnetic filed out of a dipole.

[@1833-j4g]

The near-field effect in the light may have been from the alternating magnetic dipole moments of the charged particles inside the antenna inducing a current in the mercury vapor inside the fluorescent bulb. Some fluorescent lamps, in particular a type of induction lamp, utilize this principle. The fixture typically contains a coil with a high-frequency AC potential powering it, and the bulb is simply glass filled with argon, mercury, and the phosphor coating. No electrodes, so the usual “sputtering” effect of the typical electrodes (that leads to the death of the bulb) is absent. Very interesting!

[@martinamadsen812]

Fascinating experiements! 🙄 Stay safe, regards Niels ❤💕

[@maheshnerlekar9791]

OMG fantastic ......thanks a lot ... if such experiments are shown .....all people including non technical ....will start loving the physics,maths & nature.. .....

[@jayeshrohilla7215]

this is the best video i have seen til today

[@aaabatry]

I feel like that's a bit too close to be around that antenna at that power output...

[@ShopperPlug]

Lets not forget 300 watts of electromagnetic field is being pumped out from that dipole antenna.

[@t00by00zer]

Has no effect on you as 300MHz is a very long wavelength.

[@t00by00zer]

@@ShopperPlug Stand under a transmission line and you have megawatts of 60Hz EM radiation. Neither has any effect on you because the frequency is too low.

[@ShopperPlug]

@@t00by00zer yea it’s somewhat true that strong electromagnetic fields does not have much impact to humans, but I’m not convinced, there is not enough scientific data suggesting strong electromagnetic fields is 100% de-facto safe.

[@t00by00zer]

@@ShopperPlug It's not the field that gets you. It's how fast the field is vibrating that gets you. Standing next to a 10 megawatt, 60 cycle transmission line has no effect on you. Change that to a 100W microwave and your skin cooks. It's all about the frequencies and what they in turn resonate with in your body.

[@Cicuiranu]

As you I use to show this to my students (ESIEE Paris) but with the help of a Baofeng and a log-periodic Yagi. I don't have an 100 W RFPA ! But I believe you don't use it at full power otherwise the bulbs will suffer somewhat. Using an horizontal reflector below RX and Tx dipoles you can also show the Fresnel zones. All students like to see that :D

[@NatSciDemos]

Yes the amplitude of the oscillator that feeds the power amp is turned almost all the way down, so the total output of the transmitter is less than 20 W/m^2, otherwise we could burn out the tiny bulbs on the receiver antennae :)

[@ovalwingnut]

WOW. Spelled W.O.W. GR8T demo. This explained a lot.

[@Mark300win]

Thank you so much for taking the time to create such valuable video

[@Avalon888]

That was brilliant. I bloody love the Internet.

[@jakelemay7913]

This is forcing me to think and improve my antenna - and hang a few more. Thank you.

[@ericsu4667]

How is the receiving antenna at 3:20 time stamp constructed? Is the light bulb attached to a single rod? Or the light bulb connected to two half rods?

[@NatSciDemos]

Yes the receiving antenna is divided into two segments of copper, with the lightbulb connected between them.

[@ericsu4667]

@@NatSciDemos In this case, light bulb and two segment of copper form an open circuit. There is no electric current in any open circuit.

[@serpentine1983]

Superb Demonstration! Thank you!

[@grnagaraja]

Thank you very much for this educative video and visualise the antenna field surrounding it. Tnx for sharing VU2GNR

[@otilainen]

Amazing presentation, thank you!!!!

[@othoapproto9603]

It would be fun to build an array of lights and coils along the dipole emission field in 90° orientations to see this effect. thanks for sharing

[@geckoproductions4128]

OUTSTANDINNG! Very well done. Thank you

[@iankidd6654]

One of the best videos I have seen KZbin

[@namehidden8854]

Great way to demonstrate this. Thank you!

[@NatSciDemos]

Glad you enjoyed it!

[@ehvway]

I hope all those people who say 5G isn't harmful are watching this video. They should read Silent Weapons For Silent Wars. Great video sir

[@schmetterling4477]

Nobody forces you to use a cell phone. Wait... what did you watch this video on? A computer? With WIFI, right? :-)

[@All7Miles]

Most excellent presentation! Seeing the relationship between linear dipole and magnetic loop orientation for maximum current flow is critically important; I’m trying to design an antenna with the inductive sensitivity of a magnetic loop yet able to reflect and direct the electric field aspects of radio signals the way the capacitive character of the linear dipole is able to accomplish. However I’m not able to “see around” the fact that the magnetic field is 90 degree perpendicular to the electric field which is oriented in the direction of wave propagation...an essential fact for electric wave reflection.

[@uploadJ]

Do a search for 9A4ZZ bipole antenna. It is not short dipole, it is instead an E-field two-pole radiating structure ... especially look at radiation pattern. Minimums off the broadside whereas dipole HAS max off broadside.

[@mosiotv]

Great visual demo and explanation , very helpful 👍

[@anthonyhitchings1051]

so much better than only a text book

[@Arshar]

Resources online today.. omg.. double thumbs up !

[@oneministries4878]

How far away can the receiving antenna “receive” and what can be done to amplify the signal? Didn’t Tesla try building a large antenna to produce “free” electricity with similar technology?

[@danieljust295]

And what’s more what is the impact of high frequency signal on human body and also why is the efficiency of wireless power transfer.

[@enricodececco_LRods_technology]

Very interesting demonstration, I believe that it is the same emission that leads to close the dipoles of the L-rods with an electric field and variations of the unified field :-)

[@belaji]

This is a very cool demonstration! Can you come up with an experiment that reveals the phase relationship of the electric field to the magnetic field close to the transmitting antenna? I'm interested in an experiment, not in a variety of equations. Thanks.

[@andyeverett1957]

If you had an oscilloscope I think it could be done? It is an interesting idea as the fields at far distance, electric and magnetic, are in phase while near the antenna there are parts of the fields that are 90 degrees out of phase. You would need tiny examples of the test probes used in this experiment, a small dipole receiver and a small magnetic dipole receiver connected via coax and connected to the oscilloscope with equal length leads you could then see the phase relationships? Please make a video as I don't have an oscilloscope. Thanks.

[@uploadJ]

@@andyeverett1957 I have wanted to make this kind of measurement for awhile. Have never gotten around to it ... maybe I should revisit this test having acquired several vector voltmeters as well as several dual-trace scopes ... I also contend that the traditional; dipole antenna works on the principle of the magnetics (magnetic field) to create the 'radiation' and not the magnetic ... not even the combo of the E and H ()or B) fields - JUST the H field.

[@adarshverma2586]

What a demonstration sr👏👏👏

[@maheshkumarkshirasagar3563]

Absolutely mind blowing learning from this video

[@elmultimediaschoolofartscu3924]

Thanks , more videos on this please, 🙏🥺 wireless aluminum wall, wireless energy using water 😊😊😊😊😊

[@luimackjohnson302]

Good demonstration. That's what Nikola Tesla wanted to achieve, to be able to transmit power thru radio waves and light up the world! I believe he was way ahead of his time!

[@Laienhaftes]

And nobody wanted to finance his idea, because everyone with an antenna could receive the energy and you had no way to charge money for it.

[@mrtechleg2706]

Not wanted to achieve, he did achieve it. It's the world that stays stupid

[@josephhacker6508]

@@Laienhaftes well no, since you'd need special equipment to get the power and turn it into something besides sound. So the hardware would cost money.

[@Laienhaftes]

@@josephhacker6508as soon as you have the equipment to receive the power (and that's very easy and cheap to achieve) you can consume power and the transmitter can't tell how much you are consuming.

[@lajoswinkler]

@@Laienhaftes Totally wrong. Transmitter detects a load. Tesla's idea was flawed in many ways and that's the reason why it never lived in the way he imagined it. Not because of some conspiracy.

[@dxx998]

Really vivid presentation！ I'm just curious why the lightbulb doesn't need a rectifier?

[@NatSciDemos]

Which lightbulb?

[@brushfuse]

I get the feeling Nikola Tesla would have enjoyed seeing this.

[@mailamaila5918]

Absolutely correct

[@ronniepirtlejr2606]

I have a feeling that he has seen this, way before this professor was even thought of!👍

[@dabig_guy2204]

Actually, Tesla is the Father of all this science, on paper.

[@ronniepirtlejr2606]

@@dabig_guy2204 yes, I thought so!👍🇺🇸

[@charlesdickens6706]

Tesla never seemed to have gained the insight for effective physics for transmission. I'm thinking that's where Marconi stepped in and received credit for invention of radio communication.

[@tusharanand1789]

Why flourescent bulb is more brighter at top than it is at bottom?

[@fredfrancium]

Because the top is at higher field Exposure, the amplitude is drop by distance

[@Flumphinator]

Higher flux closer to transmitting antenna.

[@fbach2100]

Outstanding explanation 👍 thanks for sharing.

[@ThierryC2373]

Awesome demonstration!!

[@slateisa]

What if the antenna is round, like a dome? Maybe it transmit power 360 degrees.

[@wancable9702]

try qfh antenna

[@fredfrancium]

The radiation pattern should be omnidirectional

[@Dc_tech386]

Yes

[@MasterMindmars]

Very good. You demonstrate perfectly that there is a stationary wave surrounding the transmitter antenna. And there is more power at the borders of the dipole. Well done. I think this experiment could be a little bit dangerous for a human due to the high power.

[@Lukasz.Skowron]

What is the purpose of the capacitor in the loop?

[@NatSciDemos]

The capacitor allows the current in the loop to resonate at the frequency of the transmitted signal.

[@TheRealDanNguyen]

Thank you for this great video!

[@MLFranklin]

This is really cool. Consider how you might make a similar demonstration of concepts with household or hardware store items.

[@drkenmorris]

So to me the next step would be to capture any electricity and store it. Can that be done? Or can it only provide a throughput to the load? And if electricity can then be captured from the B-field antennae, can it be scaled up to the point that it produces a significant enough amount of electricity to power electrical devices or even a home.?

[@Adrian-qi9oe]

Great explanation! Thanks.

[@lucasjavierrodriguez8846]

Anytime I'll see one of these videos I feel a little bit stupid and I love it..🦊🧡⚜️⚡

[@Phil-nz9ux]

I love your remarks and, if you brought a circular antenna and take it to a spin, I'd love to see what it does. Because you, it's on a linear point of view. . . J'adore vos remarques et, si vous apportiez une antenne circulaire et que vous l'emmenez à une rotation, j'aimerais voir ce que cela fait. Car vous, c'est sur un point de vue linéaire . . .

[@mariusz17772]

Super film. Dziękuję bardzo

[@domozs4370]

A co na to 6?

[@HowardKlein1958]

I surprised my wife by striking a fluorescent tube in our garden with the long wire antenna overhead running about 60 Watts. I was just holding it like Darth Vader.

[@vahagnmelikyan2906]

So what will happen if I connect both edges of copper pipe to a motor with rectifier would I get a motor running off of antenna?

[@clemkadiddlehopper7705]

That's some cool old school Tesla OG there

[@9874482354]

very interesting. well demonstration

[@marwansallouta2101]

Well attractive explanation, thank you.

[@Jimmyjimjimjim]

Safety first. Glad he is wearing a mask around high voltage.

[@jamesantares8772]

🤣🤣🤣🤣🤣🤣

[@greedskith3020]

I just don't understand it... But it was amazing to watch...

[@mattman8685]

Thank you and more please!

[@MegaG1974]

What happens to the strength of the signal when both receiving antennas are present.

[@gallodeplata]

This gives me bumps, geting back to that tesla photo holding a light bulb

[@unpopuIaropinion]

Hey everyone, so I have just starting learning about electromagnetic radiation. Can someone explain to me, is the light we see in this video produced solely by radio waves? That is amazing and also so strange to me! I was under the impression that radio waves are very weak ! Can someone explain to me how weak radio waves can produce visible light ? And what would be the effect of such strong radio waves to the human body?

[@yakovdavidovich7943]

The video says it's a 100W amplifier; not sure how much output he actually gets, but if it's any significant fraction of 100W, it should be no surprise. RF emissions are not weak per se -- it depends on how much power you put into the antenna. Power transmission is an inverse square law, so power density falls off very quickly. But a few feet from the antenna, there is still a lot of power per unit area. It produces light by producing currents in the resonant rod he's using as a receiver. The EM fields shove free electrons back and forth, creating an alternating current, which dissipates power in the light bulb. It will not work at longer distances, because of the inverse square law. But very high gain antennas at high frequencies (think microwaves) can be used to efficiently transmit power wirelessly in a well engineered system.

[@FIRE_STORMFOX-3692]

@@yakovdavidovich7943 like tesla envisioned??

[@ds-1111]

If you really want to blow your mind, understand that radio waves and light are the same thing. One is just visible, the other invisible, because of their wavelengths. A radio transmitter antenna is just one big lightbulb, but you just can't see the light. Know this: 1: Any time an electron accelerates or decelerates (moves) it will emit light. 2: Any time light hits an electron, it moves the electron. A radio transmitter is just moving electrons in a wire to emit radio wave light. A radio receiver just allows the light to move the electrons in the antenna. When electrons move in an metal, it is called electricity. Now... understand that you are made of electrons. All the light, all the radio waves around you, are vibrating electrons on your skin. Depending on the wavelength (size) some light passes right through you (like x-ray light). Some light just hits your skin and doesn't make it all the way through because its too big. Some light will heat you up too like a microwave. This happens everywhere at all times. Its relatively harmless until you have high frequency light strong enough to break electrons off of atoms which we then call ions. That is called ionizing radiation and can destroy parts of your body and give you cancer. Neat fact... you are emitting light. In fact... since you are made of electrons, if you wave your hand side to side 3 times a second, you are generating 3Hz radio waves. You are now enlightened.

[@wolfgangrueckner7151]

@@yakovdavidovich7943 the incandescent light bulb only needs 1/2 watt of power to light it

[@leonardodorigo8091]

Usual radio waves are super weak in order not to harm... But you could have "strong" ones like those in the video... Is just a matter of intensty (aka "how many" waves)

[@andriinebylovych2989]

Thank you so much ❤

[@vahagnmelikyan2906]

How's that possible when electricity flows evenly in a wire. Why would you have high current in the edges?

[@SDS-1]

I used this effect years ago with my CB radio. Had a 6 foot fluorescent bulb on roof of car that would light with no wires

[@jarmenkell2313]

COOL !! 😀👍🏻 Thanks, Bro

[@banitoflakes]

Amazing sir 🌟🌟

[@FAB1150]

I want a 100W transmitter too, it would be fun to use lol

[@prakharmishra3000]

Yeah you'd be in jail before you can even power it up

[@gato-de-schroringer]

Quando a antena estava em uma posição perpendicular e ele aproximou o dedo, notei um repentino aumento do brilho da lâmpada incandescente. Ou seja , o corpo do rapaz está também servindo de transmissor .

[@rickinmi]

Does that mask filter the radio waves, or just the magnetic waves?

[@fredfrancium]

Do we have this up and down in amplitures far fields?

[@fredfrancium]

@@kirkhamandy then why the phone signal is not goes up and down in distance

[@fredfrancium]

@@kirkhamandy if the power amplitude of signal goes up and down in respect to wavelet, if Fairfield. Then the signal stength 📶 in phone should fluctuated too.

[@thomasmaughan4798]

@@fredfrancium "then why the phone signal is not goes up and down in distance" The signal strength goes down with distance in what is known as "inverse square law" (double the distance, 1/4 the signal strength). your phone is a radio. Essentially all radios have automatic gain control. Anyway, that's also irrelevant since voice is digitally encoded and will sound exactly the same whether the "bits" are strong or weak.

[@rangaiahkaravadi5340]

Excellent demostration. Educative and very useful. However I have one doubt. Why the bulb in the receiving antenna didn't glow brighter when the same is brought in line with the axis of the main antenna?

[@NatSciDemos]

Thanks. If your question has to do with the signal attenuation that happens at around 3:28, it is because the transmitted signal is minimal along the axis of the transmitter. Think of the pattern as shaped like a big donut (toroid), with the holes pointing in the same direction as the axis of the transmitting antenna.

[@_xBrokenxDreamsx_]

cool but how do you change the frequency of radiation/reception and how high are we able to get?

[@teem_news]

Beautiful. Thank you

[@neutronenstern.]

one question: If we had a 600Thz resonator, would this antenna be shining green polarized light, and how would this look like? Would this be the most efficient lightbulb? (i know atoms are such resonators, but what i mean with this, is the same Setup as this, but with 600Thz.

[@BigRed1500LC]

I wonder what his RF exposure numbers are!

[@1833-j4g]

This is an excellent and very concise demonstration! Also, how many volts is coming from the amplifier?

[@321CatboxWA]

Is the receive antenna presenting a load at the transmitting antenna ?

[@NatSciDemos]

No.

[@321CatboxWA]

@@NatSciDemos 100% decoupled then . No chance of multiple receiver antennas driving lamps placed in equidistance over one wavelength away from the transmitter will have an effect on the observed signal strength available to a receiver multiple wavelengths away ( line of sight) leaving no possibility of shunting the transmitters signal so as to diminish the transmitters effective range? . In other words , no such thing as a RF 'sink or trap " ? Thank you very much for your time !

[@alfalfa8168]

great video as always :D

[@jaakkooksa5374]

4:45 Couldn't you just break the loop and connect the bulb in between for the same effect?

[@leonardodorigo8091]

It is part of another experiment i suppose

[@thomasmaughan4798]

"Couldn't you just break the loop and connect the bulb in between for the same effect?" Yes, he couldn't. The loop is resonant and depends upon the presence of both capacitor and inductor (the loop itself). It develops a rather high voltage but low current at the capacitor, and a high current but low voltage opposite the capacitor. You attach the light bulb aross the loop at a point where the voltage and current is suitable for the lamp but not so close to the capacitor that it damps the oscillation.

[@thomasmaughan4798]

@@NRGY " I guess you tune the C to make it achieve Fr." Yes indeed.

[@beethovensg]

Technology created at the beginning of time, inherent potential energy. The Great Pyramid employs these aspects. Nikolai Tesla knew it.

[@tsuzukadesu]

Is it practical to use for free street lighting?