How do Signal Blockers Work? (Faraday Cages)
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- Опубліковано 26 вер 2024
- Many retailers now sell signal blockers to thwart digital snoops. How do they work, and are they really necessary?
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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.
Madness1 useful for stopping kids going on their phones
That is an excellent idea for a school!
Lorenzo Benito It’s actually illegal if you can’t dial Emergency services in a building.
@@gokudoge7588 That is what land lines are for. Schools have them.
@@jprobe good ol land lines, still got a rotary phone here
No intro finally!!
Ivo it'll be back.
They might have forgotten it
lol u are right...
Why finally?
There was nothing wrong in the intro!
in other words - no instant dislike :D
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.
we now have new non metal screens
So you got continuous sponsorship from Jibo I see?
5:20 Such a smooth shirt transition...
Dog2puppy MCPE damn
Now I understand the science behind why "it's not recommended to have a phone conversation inside an elevator"
Thanks, Linus!
Is this why my grandma lives in a metal trailer, so I can't be on my phone when I visit? Lol
No, that's because the financial situation of the average person in America is fucked.
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.
How much did Jibo pay for you to wear that shirt the past few videos?
Don't steal my questions
0:36 I absolutely lost it at Festivus Pole. Thank you, whoever wrote this.
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)
Or... if you have a cheaper phone, you can buy more than 4 times (maybe.)
No wonder why I highly honor Michael Faraday .
yes the intro is gone
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!
I love the thoroughness of the explanation and examples and the gratuitous animations. great vid, yos.
h7opolo, yes, it's thorough. It's also completely wrong, but hey.
i disagree. please elucidate the shortcomings for me. ty.
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.
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?
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.
1 Wrap the mobile phone in foil
2 Call this phone
3 You hear a ringtone
What am I doing wrong?
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. 😅
Love your videos, they have inspired me to start building my own pc's
Thanks for removing the loud intro. My ears appreciate it. A lot.
I guess my parents are going to try and find a Faraday cage big enough to be my bedroom :(
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.
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 :)
And now we wait for ChannelSuperFun episode on them trying to make a internet-free tent on their own.
Did they forget the intro on this one, or got rid of it?
Greban Dcunha hope so its annoying
How long have you been wearing that Jibo shirt
2 monhts? lmfao
i think he's in love with jibo now..
I do believe those were ink security tags not rfid.
linus is still right
Lol the Jibo shirt
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 :)
Time for the airing of the grievances! Thumbs up for a festivus for the rest of us!
I gave this one a like and a comment just for not having that outro at the beginning.
4:44 I use Linux Mint OS on laptop, and desktop, and Raspbian on raspberry pi , and I love synergy! It's so awesome...
Should I be worried about KFC somehow turning into an electronics retailer?
Yes lol
You and that dang jibo magic eightball shirt.
I guess Linus did a mass of videos before ces in one day?
>nature's unintentional faraday cage
>the elevator
>Nature's
Is Linus having a secret love affaire with Jibo?
I think he was just on a filming binge :)
yes lets make that cannon
+honza0022 Hmm, I didn't think about it.
Scroll Down Please its a cool shirt
Maybe he like to jibo the wibo. Lmao.
Can we all appreciate the festivus joke around 0:40
That Seinfeld reference was OFF THE FUCKING CHAIN
I love that you are rocking the Jibo shirt.
But can I build a Faraday cage for a room so when the next CME/ Geomagnetic storm hits, I can protect my gear?
US yes
THEY GOT RID OF THE INTRO GUYS YESSS
yippeeeee
They did??????? Man, I so used to it, I didn't even notice it anymore.
+Ken Liu (_Whale_) ME TO!
IT WILL BE BACK!
oh shit
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
this should depend on the wavelength in relation to the size of the faraday cage though, no?
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
The KFC bit at the end LOL 😂 thx man needed that laugh
Linus, the best conductor is the best obstruct (elements with low magnetic permeability).
Nothing demonstrates this idea better than an EMP BOMB.
Reminds me of my pager repair days. Used the cage to block all signals to adjust sensitivity.
Okay Linus, you get a thumbs up for the festivus reference.
funny how im watching this on my new router which can reach the whole house now
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.
Hmm, can any of you give any tips against laser weapons? Nice to know ...👍
A $5,000 tent!?!?!?! It better come with built in wifi.
D4rK3sTsH4d0W i honestly dont know what to say about that
Happy festivus for the rest of us!
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....
i'm thinking, you could hang metal sheets on the bordering walls...not sure if i understand it enough though.
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?
Tyler Lazenby das right, also u wont be able to use wifi or bluetooth
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.
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.
Doskii the microwave only blocks microwaves because it wants to keep its microwaves inside to cook your food
I love that somebody just took a testing approach for this!
That is not how a Faraday cage works.
Radio signals are not just electric fields (though if they were, your explanation would be corrected). They are electromagnetic waves. The Faraday cage cancels out the electric part of the wave, by moving electrons through it's conductive material, and without the electric part of the wave, the wave stops. You were pretty close I suppose.
Natures faraday cage: AN ELEVATOR
techquickie x physics class 2018 ultimate anime crossover
Do you wash your jobo shirt ?
They just send him a new one every other day
i know linus as a tech youtuber. So i dont know if i can trust him for physics.
Thanks for helping me with my final, Linus! Love your videos
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 UA-cam Search Term: Jordan Bronson Faraday Cage
your so funny! thanks for that explanation with a dash of laughter!
interesting information. I wondered why in Walgreens Stores why When i got past the front door i had no bars. there we go!
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.
You make good content and I appreciate your videos.
Worth noting not all metals act or in this case blocks equally.
A faraday cage must be grounded to work, also it doesn't block electromagnetic radiation, it lets the EM pass through with it being canceled INSIDE the cage
We use this in the military, everyguy who carries portable ones is bald, coincidence ? Maybe
Linus wearing a Jibo shirt.
Theory: Jibo was mad that he dissed their robot and forced him to wear their shirt in every upcoming video and make an updated video at CES
0:45 that explanation is wrong, that explains how they work in electrostatics regime. What actually happens is that the electric field oscilates (due to the nature of the electromagnetic radiation itself), generating oscillating currents inside the conductor, witch dissipates energy by Joule effect.
read the article referenced why you don't need rfid protection in your wallet. while it may be true that you need a pin in Canada, in the US and other countries, you don't need a pin to use the card, meaning that hackers could steal your card's info from afar and use it in fraudulent purchases
Festivus pole !!
Copper mesh inside the walls, does the job, to block signals? Cheap and effective for those with electromagnetic hypersensitivity ?
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
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?
4:30 Notification bling!
nice jibo shirt
It should be noted that Faraday cages need to be grounded in order to function properly.
You are 100% correct! 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 UA-cam Search Term: Jordan Bronson Faraday Cage
Awesome video on an awesome topic..
Great explanation linus, but i knew it before
Is THIS why ppl in jail really think a lot better?
THEN they're sorry?!
Haha - had to throw that in!
Why Do We Love Linus And Jibo Together? Idk But We Do 💕
After spending 900 dollars on Jibo... He's really making that shirt count eh? 😂😂
why linus have jibo shirt again
He films 10 episodes in a few hours across all channels and then wanks it off for the rest of the month.
well that makes alot of sense
So cage made of net with spaces smaller than wave length, which means about 1foot (30cm) for blocking cellular network, right?
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 UA-cam Search Term: Jordan Bronson Faraday Cage
The biggest problem with contactless cards at least here isn't the threat of identity theft but that they can be charged without entering a pin, this allows people to steal money by charging cards in peoples pocket.
love Techquickie!!!
*Shout-0ut to the Festivus Pole!!!*
Thank you Linus!
JUST LOOK AT ALL THE PEOPLE BEGGING FOR THE INTRO BACK.
SCP-055 is contained with a Faraday cage, so that's why I'm here.
A faraday cage that is not grounded is a antenna! And all tinfoilheads do not shield, they amplify! *mindblown*
I feel like they found the KFC tent and made a video for the punchline. Almost like a bad Saturday night live skit... I guess bad is implied when I said Saturday night live.
looks like you need to test out the fareday tent lol
If you enter a store with a metal lined steal bag the owner gets a vibrating signal on his pager.
So he knows if there is a thieving guild in his store.
MsUltrafox what if his phone is wearing one to?
*puts microwave door into sub* NOW I'M INVISIBLE MUHAHAHAHAAH
HAPPY FESTIVUS!
Lol.... the thing arround the cable is for grounding as well.... or how you call it.... to kill electricity when electricity gets to it..... im dutch lol
yes, however Linus didn't mention this not beeing the case.
It's for grounding and the cage
I have a friend that keeps duplicates of all his electronics in faraday cages. Two laptops, two smartphones, two tv's, etc. Kinda shitbat crazy if you ask me.
It's too protect against EMPs (electro magnetic pulse) which can come from a nuke or the son and considering nassa has said we are over due for the next one while I will say is is a little over prepared in a sense he isn't that crazy
Yeah, a Faraday cage isn't going to protect against an EMP. You basically need a lead box to do that.
no you don't, a Faraday cage will work.
En oK It really depends on the kind of EMP, if a nuke goes out near you then even a good Faraday Cage won't do it because there will be also X-rays and gamma radiation that can easily get through it unless it's veery thick
why?
"you know as much as i love tech" wears a friggin jibo shirt..