How do Signal Blockers Work? (Faraday Cages)

Рет қаралды 484,235

6 жыл бұрын

Many retailers now sell signal blockers to thwart digital snoops. How do they work, and are they really necessary?
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Пікірлер: 597

@madness1931 6 жыл бұрын

When I was at school, the entire place was a Faraday Cages, because it was refurbished from an old bomb shelter. Nobody, and I mean nobody could get a signal unless you were outside.

@ExpiredCartonOfEggNogg 6 жыл бұрын

Madness1 useful for stopping kids going on their phones

@valhar2000 5 жыл бұрын

That is an excellent idea for a school!

@gokudoge7588 4 жыл бұрын

Lorenzo Benito It’s actually illegal if you can’t dial Emergency services in a building.

@jprobe 4 жыл бұрын

@@gokudoge7588 That is what land lines are for. Schools have them.

@mastersergant1287 4 жыл бұрын

@@jprobe good ol land lines, still got a rotary phone here

@ivomo_ 6 жыл бұрын

No intro finally!!

@jakesimm5889 6 жыл бұрын

Ivo it'll be back.

@JonatasAdoM 6 жыл бұрын

They might have forgotten it

@livelaughliao 6 жыл бұрын

lol u are right...

@lykourgakhs 6 жыл бұрын

Why finally? There was nothing wrong in the intro!

@ThePsEuDoAnOnYmOuS 6 жыл бұрын

in other words - no instant dislike :D

@user-mg8gb8gm7i 6 жыл бұрын

Is this why my grandma lives in a metal trailer, so I can't be on my phone when I visit? Lol

@Colaglass 5 жыл бұрын

No, that's because the financial situation of the average person in America is fucked.

@avi12 6 жыл бұрын

Now I understand the science behind why "it's not recommended to have a phone conversation inside an elevator" Thanks, Linus!

@Ceielo 4 жыл бұрын

0:36 I absolutely lost it at Festivus Pole. Thank you, whoever wrote this.

@Raress96 6 жыл бұрын

So you got continuous sponsorship from Jibo I see?

@imbadwrench 6 жыл бұрын

I live in a Faraday Cage. there are 2 to 3 layers of foil backed foam insulation over my entire house and the seams and corners are mostly taped also. When my parents built the house we had to take 2 screens off the windows facing the cell towers for cellphones to work inside the house.

@imbadwrench 6 жыл бұрын

we now have new non metal screens

@misuzu8814 6 жыл бұрын

yes the intro is gone

@AndreTKemp 3 жыл бұрын

Great video! Straight to the point and contained all the information I needed to remedy some issues I'm having with a current project! Cheers :)

@catgirlinspace 6 жыл бұрын

5:20 Such a smooth shirt transition...

@Minty_Mentos_ 6 жыл бұрын

Dog2puppy MCPE damn

@2SNesbit 6 жыл бұрын

Back in the (mainframe) days, a data center was built at an air force base in the state where I live. Unfortunately, when they activated it, the (large) disk drives would periodically have voltage spikes and drops causing problems. It was discovered that the ground control radar for the airplanes periodically swept the building in its circular sweep. The initial and temporary solution was to wrap the building in chicken wire which seemed to work until a more permanent solution could be implemented.

@ComixsYT 6 жыл бұрын

How much did Jibo pay for you to wear that shirt the past few videos?

@StormCrusher94 6 жыл бұрын

Don't steal my questions

@udenszirnis1644 6 жыл бұрын

And now we wait for ChannelSuperFun episode on them trying to make a internet-free tent on their own.

@kyle924 6 жыл бұрын

Love your videos, they have inspired me to start building my own pc's

@siriusplayz5871 6 жыл бұрын

Hey Linus, I'm a huge fan. Always watch all your videos regularly. I have a request. Please make a detailed video at this topic. How does the international space station orbit around the Earth. Its movement, mechanism, procedure and route etc. I have heard some crazy things and can't understand them without any visual aid. I love space, I hope my request falls on your (Specifically your) teams ears. Much respect for you and your whole team Lines. Thanks :)

@chrissosexybaby 4 жыл бұрын

You make good content and I appreciate your videos.

@SmoothBob 3 жыл бұрын

thanks linus, this is exactly what i was looking for!

@RHCroeihardcool 6 жыл бұрын

THEY GOT RID OF THE INTRO GUYS YESSS

@conston 6 жыл бұрын

yippeeeee

@dive_whale 6 жыл бұрын

They did??????? Man, I so used to it, I didn't even notice it anymore.

@JonatasAdoM 6 жыл бұрын

+Ken Liu (_Whale_) ME TO!

@livelaughliao 6 жыл бұрын

IT WILL BE BACK!

@dive_whale 6 жыл бұрын

oh shit

@jesse-dg8yx 6 жыл бұрын

I guess my parents are going to try and find a Faraday cage big enough to be my bedroom :(

@alejandrocespedes1544 5 жыл бұрын

Thanks for helping me with my final, Linus! Love your videos

@JodBronson 5 жыл бұрын

I have been sleeping a a Faraday Cage for 2+ years. I can tell you, that when I wake up..... I feel relaxed and get a lot of Energy. I also only sleep 4+ Hours per day. Although I try to get my 8 Hours daily, but somehow I get so much Energy, I only need about 4+ Hours. NOTE: I have a video in my Channel about my Faraday Cage. If you can't find it, you can easily search on KZfaq Search Term: Jordan Bronson Faraday Cage

@h7opolo 6 жыл бұрын

I love the thoroughness of the explanation and examples and the gratuitous animations. great vid, yos.

@unvergebeneid 6 жыл бұрын

h7opolo, yes, it's thorough. It's also completely wrong, but hey.

@h7opolo 6 жыл бұрын

i disagree. please elucidate the shortcomings for me. ty.

@unvergebeneid 6 жыл бұрын

h7opolo, "electric fields push charges away from them." Uhm, depends on the charges and more importantly on the fields. Linus also didn't just misspeak, the animation shows a vertically changing field exerting a static force in the horizontal direction of the wave's propagation. What's that supposed to be, radiation pressure? Also, no word on the fact that EM waves need a minimum frequency for a given Faraday cage to work on them, which is especially important in case the whole explanation was meant to look at a static case.

@h7opolo 6 жыл бұрын

He did state that the electric field was moving in a negative to positive direction which repels positive charges, so your first point is moot. For your second point, would the animation be more correct if the arrows and field lines pointed up and down instead of left and right?

@unvergebeneid 6 жыл бұрын

h7opolo, maybe you should watch the video again. He not only doesn't say what you're saying there, he also said that electrons are drawn towards the signal source. That's total BS. And even if he'd said what you're saying, it _still_ be wrong by 90 degrees. Sorry, but I can really find nothing redeeming about this explanation. The animation seems to mimick the one from Wikipedia, only that that one's not wrong. So go to Wikipedia everyone instead of watching this video.

@ScrollDownPlease 6 жыл бұрын

Is Linus having a secret love affaire with Jibo?

@honza-qj5op 6 жыл бұрын

I think he was just on a filming binge :)

@WhyGodby 6 жыл бұрын

yes lets make that cannon

@JonatasAdoM 6 жыл бұрын

+honza0022 Hmm, I didn't think about it.

@hologram94 6 жыл бұрын

Scroll Down Please its a cool shirt

@theenzoferrari458 6 жыл бұрын

Maybe he like to jibo the wibo. Lmao.

@AmanSharma-fr4uu 6 жыл бұрын

Awesome video on an awesome topic..

@mouurusai 6 жыл бұрын

1 Wrap the mobile phone in foil 2 Call this phone 3 You hear a ringtone What am I doing wrong?

@sergiowolfpac 6 жыл бұрын

If you want an escape from your phone, rather than buying the KFC Faraday Tent, smash your Iphone X to pieces, and buy a new one later. Repeat up to 4x and it'll still be cheaper than what KFC is selling. (assuming you sell your broken iphone for parts)

@dive_whale 6 жыл бұрын

Or... if you have a cheaper phone, you can buy more than 4 times (maybe.)

@user-xb1ql9xz2t 3 ай бұрын

No wonder why I highly honor Michael Faraday .

@opm-sriram2070 4 жыл бұрын

love Techquickie!!!

@danbrayton7031 6 жыл бұрын

Lol the Jibo shirt

@ri8c 6 жыл бұрын

Thanks for removing the loud intro. My ears appreciate it. A lot.

@tamascoleman 6 жыл бұрын

How long have you been wearing that Jibo shirt

@TheElectroclassic 6 жыл бұрын

2 monhts? lmfao

@vojislavS8652 4 жыл бұрын

Thank you Linus!

@KeithAinsley 6 жыл бұрын

Reminds me of my pager repair days. Used the cage to block all signals to adjust sensitivity.

@westharpe2692 6 жыл бұрын

Hey, I've often considered having "faraday material" built into home walls to prevent the 100+ wifi signals in my neighborhood from confusing my router...lol, but seriously!

@SouravTechLabs 6 жыл бұрын

4:44 I use Linux Mint OS on laptop, and desktop, and Raspbian on raspberry pi , and I love synergy! It's so awesome...

@fakjbf3129 6 жыл бұрын

Should I be worried about KFC somehow turning into an electronics retailer?

@chingguskhan8774 4 жыл бұрын

Yes lol

@VeVe_AR_Guy 6 жыл бұрын

Happy festivus for the rest of us!

@willharris8632 6 жыл бұрын

I guess Linus did a mass of videos before ces in one day?

@DG-zu4iy 2 жыл бұрын

your so funny! thanks for that explanation with a dash of laughter!

@stupid_tree7158 6 жыл бұрын

My physics teacher shows us her wifi blocker she made from scratch. She never used it, but she did threaten my class with it. She said it would only block the wifi in her room too. 😅

@Redrumm 6 жыл бұрын

The KFC bit at the end LOL 😂 thx man needed that laugh

@ayumuchan3541 6 жыл бұрын

Speaking of block signals why not block your IP address from the eyes of the internet with *TunnelBear!* The free VPN app that allows you to browse then web privately and secure with its 256 bit encryption. You can tunnel your IP address to any country around the world and start bear-owsing as if you were *in that country.* Check out the link in the description.

@texasdeeslinglead2401 6 жыл бұрын

You and that dang jibo magic eightball shirt.

@majdbag7203 6 жыл бұрын

Time for the airing of the grievances! Thumbs up for a festivus for the rest of us!

@SilkroadAllDay 6 жыл бұрын

i think he's in love with jibo now..

@333dae 6 жыл бұрын

>nature's unintentional faraday cage >the elevator

@flameshana9 6 жыл бұрын

>Nature's

@mmesuena 6 жыл бұрын

how many of these did you guys shoot while he still had the jibo shirt on?

@RandomNoob 6 жыл бұрын

It was probably part of the pay deal that was struck after the unfavourable review that he wears it for x amount of video's

@Henchman1977 6 жыл бұрын

I do believe those were ink security tags not rfid.

@marcusanthony1034 3 жыл бұрын

linus is still right

@hobbes3206 6 жыл бұрын

Can we all appreciate the festivus joke around 0:40

@davidnorell 6 жыл бұрын

interesting information. I wondered why in Walgreens Stores why When i got past the front door i had no bars. there we go!

@Hirvee5 6 жыл бұрын

That was interesting. Thanks

@vgamesx1 6 жыл бұрын

I gave this one a like and a comment just for not having that outro at the beginning.

@yourick1953 6 жыл бұрын

funny how im watching this on my new router which can reach the whole house now

@bushmonster9899 6 жыл бұрын

Linus, the best conductor is the best obstruct (elements with low magnetic permeability).

@olajideparis 6 жыл бұрын

I love that you are rocking the Jibo shirt.

@brianegendorf2023 Жыл бұрын

I have a question. I get that the Farady keeps electricty from getting to the inside or to the outside of the cage depending on where it originates from. But does the em field change shape to the extent that something powerful enough might not send electricity outside of the cage, but it still might bend space? And vice versa?

@kidnamedfinger6323 6 жыл бұрын

Wow, Linus really likes his Jibo shirt!

@jackpietro3475 Жыл бұрын

I worked in a nuclear facility for 10 years. AT&T is the only provider in which a cell signal can penetrate 2 feet of concrete. Not sure why they don’t market it that way.

@grebandcunha866 6 жыл бұрын

Did they forget the intro on this one, or got rid of it?

@johanleksell8044 6 жыл бұрын

Greban Dcunha hope so its annoying

@benoitcloutier6228 6 жыл бұрын

Hi Linus, I live in a condominium and I see anywhere form 15 to 20 Wi-Fi signals coming into my home. All of which are competing/searching for open channels. This is happening both on the 2.4 GHz and 5 GHz bands. Needless to say, wifi performance is significantly hindered as soon as I walk away from my SOHO router. Since I live on the top floor, I thought I would tare the flooring and install a wire mesh, like a carpet, before reinstalling the whole thing. What do you think of my idea? Do you think it would work? Ben

@usernamesarestupid 6 жыл бұрын

Nice video ;D

@ab-eu9po 6 жыл бұрын

Do you wash your jobo shirt ?

@AcidRP 6 жыл бұрын

They just send him a new one every other day

@gloid4051 6 жыл бұрын

HAPPY FESTIVUS!

@youtubeaddict-1868 6 жыл бұрын

I think my house is a faraday cage. I'm convinced I have the worst wireless signal on the block.

@vincenttjia 6 жыл бұрын

Nothing demonstrates this idea better than an EMP BOMB.

@aidanmoyer7066 6 жыл бұрын

Nice shirt bro!

@Richard-tf6oq 2 ай бұрын

Festivus pole !!

@trikstari7687 6 жыл бұрын

Okay Linus, you get a thumbs up for the festivus reference.

@uss_04 6 жыл бұрын

But can I build a Faraday cage for a room so when the next CME/ Geomagnetic storm hits, I can protect my gear?

@nyoob8790 6 жыл бұрын

US yes

@D4rK3sTsH4d0W 6 жыл бұрын

A $5,000 tent!?!?!?! It better come with built in wifi.

@jjjoshiii6659 6 жыл бұрын

D4rK3sTsH4d0W i honestly dont know what to say about that

@ChadMojito 6 жыл бұрын

That Seinfeld reference was OFF THE FUCKING CHAIN

@r_gos 6 жыл бұрын

For the sake of accuracy the radiation produced cannot enter the faraday cage but continues across it as in the space inside the cage is isolated

@Dieze 6 жыл бұрын

this should depend on the wavelength in relation to the size of the faraday cage though, no?

@vnyggi621 6 жыл бұрын

The explanation we learned in school was entirely different than in the video: if the metal bar is parallel to the electric part of the wave, the electrons in the metal move up and down along sending a em wave on their own that cancels the original one out by interference

@pdroa6666 6 жыл бұрын

yay good content

@robbieabbott5995 6 жыл бұрын

looks like you need to test out the fareday tent lol

@RAGHAVENDRASINGH17 6 жыл бұрын

Great explanation linus, but i knew it before

@sammyblaze4234 6 жыл бұрын

Natures faraday cage: AN ELEVATOR

@rajdeep.saha_ 3 жыл бұрын

KFC part was hilarious bro😂😂extra gravy lol

@mitchellshultz9327 4 жыл бұрын

So you mentioned that the frequency of the sound wave actually determines whether or not the signal will pass through a hole in the faraday cage. However I do not understand how this works. My forward thought is that the wave will pass through based on the magnitude of the sound wave, not the frequency.

@OldFormat 6 жыл бұрын

Another way to think about this is the cage acting as an antenna. The antenna is driven by the incoming signal and emits a signal 180 deg out of phase into the cage and in phase back at the source reflecting the signal back like a mirror. A lot of lower level physics textbooks actually get this wrong and describe the process as the free electrons in the metal moving and then having their energy dissipated by resistance.

@ChiliPod-zt6ib 10 ай бұрын

Hmm, can any of you give any tips against laser weapons? Nice to know ...👍

@ShadowLinkxMaster 6 жыл бұрын

Linus wearing a Jibo shirt.

@kyle8086999 6 жыл бұрын

nice jibo shirt

@DonaldHendleyBklynvexRecords 6 жыл бұрын

Why Do We Love Linus And Jibo Together? Idk But We Do 💕

@michaelariori8470 6 жыл бұрын

4:30 Notification bling!

@chadanooga 4 жыл бұрын

Omg I thought I was listening to the church lady on SNL!! Haha!! 🤣🤣

@nithssh 6 жыл бұрын

Wow, no sponsor transition that goes "speaking of "

@hunterbowman5150 6 жыл бұрын

I seriously wish I could turn my apartment into a Faraday cage. All of my neighbors use dual band routers. The 5gz channels are all super congested, and the way my apartment is set up, we are close enough that their WiFi signals are strong/close enough to interfere a crap ton with mine....

@Layarion Жыл бұрын

i'm thinking, you could hang metal sheets on the bordering walls...not sure if i understand it enough though.

@mjk6618 3 жыл бұрын

Is THIS why ppl in jail really think a lot better? THEN they're sorry?! Haha - had to throw that in!

@proximitea 6 жыл бұрын

4:33 LOL!

@ehteshamkhan2977 6 жыл бұрын

Is this really a linus' new channel?

@mrbillzy5903 6 жыл бұрын

techquickie x physics class 2018 ultimate anime crossover

@clevoro 6 жыл бұрын

So does that mean that if I just put my phone in the microwave without turning it on, that it shouldn't be able to be called?

@angelzhang_ 6 жыл бұрын

Tyler Lazenby das right, also u wont be able to use wifi or bluetooth

@_Doskii 6 жыл бұрын

I just tried this (you made me curious) and it turns out that when I put my phone (oneplus two) in my microwave the wifi signal was immediately gone and my usually stable and highspeed 4g turned into a very slow 3g connection (my provider doesn't support 2g/gsm/etc). I was still able to use the internet though (I used teamviewer to test the connection). I also tried calling myself from a different phone and it went though without a problem. The position seemed to matter, when I put the phone closer to the door it managed to keep a very weak wifi signal. So either microwaves only block certain waves or my microwave is leaking and slowly turning me into popcorn.

@The1file1 6 жыл бұрын

Doskii it all depends on frequency of the signal. Faraday cage can block up to some frequency. Basic equation is width of gaps in faraday cage is equal to half of the longitude of wave from wich you can get limiting frequency by dividing speed of light with measured longitude. So to conclude ideal faraday cage would have no gaps (like elevator) so it would block EM waves on all frequencies.

@vnyggi621 6 жыл бұрын

Doskii the microwave only blocks microwaves because it wants to keep its microwaves inside to cook your food

@clevoro 6 жыл бұрын

I love that somebody just took a testing approach for this!

@MyCatFooed 5 жыл бұрын

*Shout-0ut to the Festivus Pole!!!*

@AzKat69 6 жыл бұрын

Ah, the anti-theft signs... some shops have them, but they don't have devices to remove them, so it will "beep" while you walk through the anti-theft gate no matter what you do. (yes, I was talking about having the receipt for them, proving that you paid for them). There's a store called "Profi" that does this.

@flameshana9 6 жыл бұрын

JUST LOOK AT ALL THE PEOPLE BEGGING FOR THE INTRO BACK.

@Gameplayery 6 жыл бұрын

We use this in the military, everyguy who carries portable ones is bald, coincidence ? Maybe

@Daehawk 6 жыл бұрын

We have a large hill right behind us that works like this. Until we got cable tv in 1995 we only picked up one tv channel. Same with cell phones here. Only one carrier barely worked..Verizon. The rest no signal at all. And Verizon had only 1 bar. 2 houses down though that could get 2 tv channels :)

@TheManLab7 6 жыл бұрын

For it to work best it needs to be grounded. I’ll be getting a new car shortly and I made sure that I DIDN’T want it to be keyless. I still want to put a key in the ignition to start to car even though they can probably pick up the key to unlock the car and plug into the OBD-II socket then they could start the car that way. I’ll be keeping my keys in an earthed metal box e.g. microwave or anything else that’s completely shielded. There’s a place close to me that do items for fast jets and commercial aircraft and they’ve got a faraday cage that can fit a double decker bus with room to spare!