AMMO CAN FARADAY …. you’re doing it wrong
Vložit
- čas přidán 19. 12. 2022
- WARNING!!!!! If you stow radios in these cans take the antennas OFF!!!!
At about 7 minutes meant to say that aluminum foil
“GASKETS “ do not work……only press fit.
Super Easy and Fast, bullet proof seal (pun intended)
Will work on any size can as long as you have wide enough
heavy duty aluminum foil.
Even a mortar can…imagine the items you can protect .
The conductive layer can be very thin because of something known as the skin effect. That term describes the tendency of current to flow primarily on the skin of a conductor.
As long as the conducting layer is greater than the skin depth, it will provide excellent shielding because the absorption loss will be large. The skin depth is a function of the frequency of the wave and the conductor material.
As an example, consider that for a frequency of 200 MHz, the skin depth of aluminum is only about 21 microns. EMP pulses can have frequency content that ranges up to 1,000 MHz.
Therefore, wrapping a box in a couple of layers of heavy duty aluminum foil (typically about 24 microns thick) provides the necessary conductor thickness to protect against high-frequency radiated fields. Credit Dr. Arthur Bradley.
Last continuity check a bit bogus…just to give idea..
If someone else has posted the same method, my apologies.
Not going to chase comments as I'm too old to bother with that.
"I'm so old I remember when the Dead Sea was just sick" 🤣🤣🤣 that's gold mate! 😉👌
Dear lord, I think this is the smartest thing Ive ever seen.
You keep the rubber gasket in place, AND increase the quality and integrity of the EM seal.
This is absolute genius and so simple.
There is a truism about great inventions and scientific theories .... when someone comes up with something amazing everyone stands around saying "thats so simple, why didnt I come up with that!"
Dude you nailed it.
The whole prepper community is doing it wrong by removing the rubber gasket and mashing foil into the gap.
You minimized the amount of work
You keep the rubber seal and waterproof quality of the ammo can
You increase the EM protection.
Sir, I salute you.
Not only has he created a faraday cage he has made it possible to be used as an underground cache as well mainting the waterproof quality
RF engineer here. For the sake of accuracy, you don't need it to be watertight to be EMP proof. Case in point: The mesh in the front of your microwave that you can see thru. That's not watertight but the gap is small enough the microwave energy won't pass thru (not much anyways) it and your eyeballs don't melt when watching bacon cook. :) I think the rule of thumb is about a 1/10th of the wavelength of the highest frequency for a gap. Of course, less is better. I haven't looked into what that distance that would be (and personally I'd shoot for 100% coverage).
But regarding your video - interesting idea. One thing I wonder about is the ramification of dissimilar metals touching and long term shielding? What's an ammo can made out of? Aluminum window screen comes to mind too as an alternate material. Likely a little bit more sturdy than aluminum foil, but then there's the gap and maybe the chance the 'mesh' isn't touching adjacent strands (i.e. making a bigger 'gap'). Perhaps a layer of foil and a layer of screen? Don't know if aluminum window screen is plated or not.
Someone mentioned a metal paint can - probably the easiest solution (verify there's no plating that would be detrimental).
Yeah, I was going to comment the same regarding gap size vs wavelength.
My understanding was that a proper Faraday cage is also supposed to be grounded to an earth rod - do you have any comment on that?
I'm also curious about the effects of items placed in say, ziplock bags, and whether the layering of metal & plastic could inadvertently create a capacitor?
@@boydw1 I have more experience on the EMI side (Electromagnetic interference) than EMP due to my designs going thru EMI testing. And I definitely would defer to the EMPDoctor (sp?) for the correct answer, but I think he mentioned 'ungrounded'. Double check tho.
Ground is more theoretical than ideal. Implication being what if the ground was poor (i.e. there's a path for EMP to get thru: water pipe, wire, is the ground wet or dry, dirt, clay, sand?)...you just might have made the situation worse by giving the EMP a direct line to the Faraday cage. The other thing to consider with grounding (ground rod to wire to Faraday cage)...the wire will have an electrical length. If the wire is a 1/4 wavelength long (short on one end is an open on the other at some frequencies) at a critical EMP frequency, it won't do any good.
Interesting comment about creating a capacitor. So I think the issue would be electrostatic rather than electromagnetic and an ESD bag would solve that. I haven't looked into the construction of a ESD bag recently and maybe the 'place the device in a bag, wrap in foil, place in another bag' is the same thing. I tend to have leftover ESD bags around anyways, so I'd just use those. :)
EMI testing is better defined...the testing facility sets up a standard bench, they run the test, here's the result. You don't have that during an EMP. I think at some point, we tend to overthink things and go down a rabbit hole. There's the theoretical side and a practical side. I tend to turn this problem into " How many dB of attenuation vs. frequencies do I need?" EMI (or EMP) is always an interesting topic, and more than once there's that 'sneak path' I didn't think about in my designs and I'd have to play detective to figure it out! I'm just inclined to buy a metal paint can, grab an ESD bag and put it on a shelf!
Thanks for the reply!
So what if u are an engineer
@@BlackMamba-lt8oe So what if you are a troll?
I think connecting a wire to the lid and can is good enough to make them unified for EMP resistance, and the gap created by the rubber seal seems to be too small for any issues.
Seriously, don't damage the (steel) can or seal if you want to protect things inside, just wrap them in foil and put them in the can.
I've been doing ammo cans this way for years. I'm pleased someone else discovered the technique.
I tried using a 30 gallon steel garbage can and wasn't getting the results I had hoped for. Added four sheets of aluminum foil over the top before sealing it shut and nothing gets through now. Cell signals, wifi, Bluetooth etc. Thank you very much for this video.
Bro how to check
@@BlackMamba-lt8oe get in the garbage can and make a call? 🤣
now you're in upper part of RF, try low one (shortwave radio should be good enough to check if it shields HF too, not just VHF+) too.
Thank you for this. I was also having problems. Guess I need to add more layers.
Another idea, use RF shielding fabric instead of foil. It will cost a little more, but will be less likely to tear when opening and closing. Line the inside with a thin rubberized material in addition to cardboard to help insulate the sides better. I have started using nesting principles, put a small item inside a larger item. For instance, with this example you can buy a large metal ammo can and place a smaller plastic ammo can inside it. Great video, thanks for sharing.
Ham Radio Crash Course used an RF gasket material on his so that he could open and close it repeatedly without having to replace the gasketing material. Just another thought.
@@Sagart999 I got the idea from his channel and from DoctorEMP channel
After my first comment, I found a series of YT posts by empdoctor. He compared several gaskets, and sells the winner on his web site.
@@PreparedOverlander bro can i use wooden box
@@BlackMamba-lt8oe EMPDoctor has a great video using a large wooden box. He uses RF material to shield the box and contents. I am planning to use a metal trashcan with a RF gasket going around the top, then put a slightly smaller plastic can inside, spray foam in the open space to keep the plastic can from moving around. All the items I put inside will be in a separate bag. I have gone to the idea of nesting items in multiple layers.
I've been doing this method for ammo cans for several years. I wondered why people were takin gthe gaskets out and all that stuff. Glad you made a video to tell the world.
Plain unlined paint can. Good metal to metal seal. Just make sure its the kind with no interior costing on the can or lid.
Just did this after fighting getting a good EMP proof ammo can - tried several other methods and trials... going to this simple setup works. THANK YOU!
im an electrical engineer by degree and professionally licensed in several states. the frequency is important to consider. For example, DC power is at 0 hertz. if you wanted to block that then I suppose seal all around, however it does not transmit in the air, so it is a "mute" point. other frequencies can go through the air, but you no longer need a seal to block it. the separation can be shown by the equation γ=f/c where f = frequency in Hz, c is light velocity, and γ represents wavelength in meters. You want your faraday cage gaps to be no larger than 1/10 of the wavelength. yes, that's right, holes are ok. does not need to be air tight. so that being said, what are we trying to protect from? a worst case emp, right? so that would a high atmosphere, nuke detonated, emp. that would produce static voltage across all frequencies. so you would prefer to have small holes for the static range, but yes, holes nonetheless are fine. the higher the frequency, the smaller the wavelength. cell phones for example will require very small holes at max. you can also always easily test, instead of using water, toss in your working cell phone and call it. does it pick up or does it not respond?... if the faraday cage setup is working, it wont respond.
Thank you, someone else gets it. Question, would it be helpful if you bound and ground said void for additional protection. Asking for a friend 🤔
I actually LOL'd with that Dead Sea joke.
I used conductive copper tape on the lid, just as you say be sure to sand off the paint on the can, the lid gets tapped many layers, close the lid, open and check for rips, if you see one add more conductive copper tape, the music guys know what im talking about as they use copper conductive tape on the electronic pickups on their instrument to prevent feed back and outside interference, your way is the cheapest and just as effective, thanks for sharing great video.
Thank you sir, the information is much appreciated. I've been looking for an easy way to make one of these and now I know.
Thank you for the information. I almost went the other route. This method makes perfect sense and you get to retain the rubber seal.
I did go the other route and was disappointed when it didn't work. Can't wait to try this when I get home.
If you put a cell phone into a Faraday cage and an EMP attack actually happens, unless you know someone else doing the same who are you going to call? Probably nobody because the grid and satellite will be down as well
unless its a "dumb" phone, all smart phones are basically mobile computers ;) . i use mine for APRS, as doomsday chat device (paired with local LoRA works amazing) and store of nearly all of my survival PDF's.
@@ApocGuy - I'll be that everything on your handheld computer run from apps in The Cloud, which will be gone. So you will have your calculator, your files you stored on the phone, pictures you downloaded to your phone, and your music that you downloaded to the phone.
@@tommissouri4871 i try to steer clear from anything that remotely looks like cloud based ;). call me old school, but local storage is still THE best way :D .
After reading the comments, people think too hard and yes microwaves are faraday boxes. Take any type box 📦 and line it with brass fabric, and ground it like you would a house, you have to have a way of route the energy away from what you’re trying to protect. Let’s say I have rooms to protect some projects that I’m currently working on and don’t want to be disturbed by cellular service or a nasty EMP or meeting I wish to remain private. Just make sure that you cover all walls, ceiling and floors. I’m just someone who’s been there and done that. Oh and one more thing, don’t buy all of your materials from the same place or time 🫥🤫
" I GUESS IT'S RECORDING" 😬
I'm guessing,.. it's not the only thing you're Guessing At.
Thanks a lot for your help with trying to help people get through this hell that our government is trying to put us through. I understand completely what you are trying to do for people.
This Bud, much appreciated.
Outstanding TROOP KEEP UP THE GOOD FIGHT NEVER SURRENDER
I put one together using an ammo can before work today. I followed another video that said to remove the seal and, lo and behold... it didn't work. I guess I'll put the seal back in it when I get home and do this! Thanks for the video.
To properly guard against strong EMPs, the box needs to have thick ferrous (Iron) skins. Making the box just "conductive" blocks the Electric Field but does very little to stop the Magnetic field.
My family business used to build EMI shielded rooms for the military, and I was the "Test Guy" that tested the shields before delivery.
Now I am a Spacecraft Engineer and I perform EMI/EMC testing on whole spacecraft.
In fact, the WSF-M spacecraft for the Air Force is in Radiated Susceptibility testing for the next couple of weeks inside a very large faraday cage at work.
It is an honor to have a chance to “subscribe” to people like you.I know you can’t just share ever you know but I am subscribed and absolutely interested in hearing your ideas and advice. Me I am just trying to protect my backups of backups, maybe a few radios and such.
How about a cast iron dutch oven?
Good idea@@mesapysch
Great idea, thanks for the video.
Awesome video man. Thanks!
Thank you so much! This is something I can do!
Ty I really appreciate learning this.
Right on, thanks for taking the time to make this vid and share a joke I've not heard before, haha, is a great one! Cbeers!
Thank you sir. Excellent, and good luck.
Sand under rubber gasket and wrap the gasket in HVAC aluminum tape and put it back, creates a good seal. If a tear occurs patch with more tape. Great video I'm going to add a sheet or two of foil as well!
From what I have read, you should have conductive adhesive on the aluminum tape. Regular adhesive would be like a thin gasket. No bueno.
Am I wrong it is doing it the way he did in the video make the lid basically useless other than keeping it shut and waterproof? Because there's no metal to metal contact from the lid to the base meaning it'll just go through the aluminum foil if it's a strong enough emp. Having it metal to metal with the lid would create a thicker layer.
I tested with radio and a few other items. Works. Thanks
Thanks for your video. Sometimes simple is better.
When you test for a seal to the can, you need to scrape a bit of paint from the can and then do a continuity test from the foil to the can.
I do like this idea! For those who have deep pockets you can buy special rubber gaskets that can replace the lid gasket. They have fine wires woven in to contact the can and the lid. The adhesive is also conductive but you will have to take the paint off of the lid where the gasket sticks to the metal. Then you have a great electrical seal.
Without a good ground that is not a Faraday Cage. It is a microwave to all solid state electronics. Just like that supposed automobile devise that shunts the EMT pulse. To where. Most if not all autos have rubber tires. So they are insulated from ground. A simple dragging chain is not good enough. When it fails, try to contact the manufacture. There will be NO communication. Over a half century ago I worked on large government Farady Buildings. They won't work either because they use solid state devices to shunt the pulse, but thats the first thing that fails. Even if it works the first time, the next wave from the same bomb will destory all remaining solid state electronics. Old relays will survive but they are to slow be work. Even technicians must be grounded to work on solid state electronics because static electricty will destroy those devices. Sorry to disapoint! Buy a horse or mule if they are still alive. The government is the last place to provide real help. It's like their help at Palistine, Ohio.
A Faraday cage does not need a ground - that’s what Faraday proved mathematically. Properly made, an EM wave cannot get in - the vector sums to zero.
I just wrote something similar before I saw your comment, bldgs are too complicated, small rooms like garage or something like is the way to go. Thank you for your suggestions and service sir.🤔🫡
Well, I used to design and manufacture, cases and containers for the military that were shielded for hemp, which is high altitude electromagnetic pulse
the steel shell probably has enough overlap to shield, most frequencies
as noted before, if you look at the perforated mesh on a microwave oven you can have holes in your container, they just have to be the right size For the frequency not to pass through
In place of aluminum foil, you could also look at silver nickel coated cloth
Aluminum doesn’t shield shield all the frequencies you want
Copper tape is your friend
'the steel shell probably has enough overlap to shield, most frequencies', blocks my phone, stock ammo box latched, nothing more.
This is great! And remember Friends... We only have one (1) chance to get it right! Be Safe
The way he checks continuity!! 😂😂😂😂
Is it only the top of a ammobox that is made of steel? Is the box biodegradable or plain plastic? 🤣🤣
@@h1ern1no sir, it's a big steel box. Gotta be careful though, some older cans have little vent holes on the side.
Great job!!!!
I F-Day Proofed My Mil-Spec Can By:
1) Cutting Preferably Two Pieces Of Cardboard: First Piece From Inside Bottom To Inside Front And The Second Piece Horse Shoe Fashioned From The Left Side To Back To Right Side!
2) I Secured The Two Cardboard Pieces Inside Cuts Via Beads Of Glue Or Silicone Sealant Then, Duct/Gorilla Taped Seams And Cut Edges!
3) I Removed Newly Created Card Board Box/Insert To Completely Seal Outer Seams And Top Edge's With Aluminium Duct Work Tape!
4) I Finally Make The Cardboard Lid/Top Only Half And Edge's Covered With The Same Aluminium Duct Work Tape Along With A H.D Multilayered Right Hand Hinge Between Newly Created Cardboard Box While Retaining Plain Cardboard Innards For Insulation Protection Of Electronics/E.S.D Sensitive Components, Etc! 😎
I just bought one used. I've washed it, removed lid, and gasket. Will repaint now, add aluminum gasket, and line with cardboard.
"I'm so old, I remember when the Dead Sea was just sick". Lol.
Next time my dad says something about remembering the dinosaurs, I'll ask him if he remembers when the Dead Sea was sick! Lol.
Brilliant!
I use calibrated wide band transmitters, antennas, and spectrum analyzers to test my Faraday boxes. You can get conductive rubber for the gaskets but that is expensive and does not a have a fine pitch between the conductive particles. Fine mesh steel (filled with cotton as a shape maintainer) used in place of the rubber shield is far superior than using aluminum as a seal like you did. It doesn't have to be water tight but fine enough (smaller) than the highest frequency (shortest wavelength) components of an EMP. The reason a Fraday box works is because it is made of a ferrous metal like steel (the magnetic field is blocked while the electric field becomes eddy currents in the steel box). Try holding a magnet up to aluminum... it won't attract. So what you are making is a 3 mil (0.003 inch) aluminum cover/gasket for the box. That 3 mils around the whole edge of the box is plenty wide for a > 50GHz magnetic field to get through the aluminum edge wise, blocking only most of the electric field. Yes, it is water tight, but not wide band EMP proof. I have gotten up to 60 dB attenuation with 1 Watt 50 GHz at 10 meters. With your idea, it "looks" good from a DC perspective but not for EHF. You may get 45 to 50 dB attenuation at only 100MHz which is marginal since EMPs have some extremely high frequency components to them. Also, you need at least 1 inch of cardboard around all six internal sides of the box. Now, if you could get ferrous steel foil that would work, but stay away from non ferrous metal like aluminum or copper/gold for EMP Faraday boxes. You have to think very high power very high frequency EM energy, and you need access to equipment that ranges at least $250,000 to test it, common lab equipment will give you false results as they are not suited to measure these frequencies. Keep a few desiccant packs in the the Farady box and store in a water tight tupperwear type container within a vacuum sealed bag for long term storage.
Curious what is the cardboard for (you also said 6mm ESD foam as an alternate in your video)
@@jakegarrett8109 The cardboard keeps your electronics insulated from the metal case as the eddy currents could induce voltages if too close, the case may even arc over to the electronics if the EMP is directly overhead - so 1 inch or more is better. The ESD foam just prevents static electricity from building up (which is in the 1000's of Volts but at micro amps).
@@paulromsky9527 Suppose you set that trash can on a basement concrete floor?
@@crazysquirrel9425 Setting your trash can on a concrete is fine, but if the concrete has rebar in it, those steel bars might develop an EM field around them as the EMP occurs. This could focus the energy, but as long as your can is sealed with fine mesh steel (not copper or aluminum) those effects will be minimal. Rember, copper, aluminum, or non ferrous metals are not good seal for weapon based EMP events, they are electrical but lack magnetic properties for proper shielding. EMPs have extremely high frequency components to them, they can get through thin areas of nonferrous metals. Steel is the best for the container and all seals. Don't forget to line the can with at least 1 inch or more of corregated cardboard inside: top, bottom, and sides. Yours truly has a slide show video on this.
@@paulromsky9527 I tested the setup I have with a cell phone and an FM radio.
So long as I taped the lid to the can, I got no sound other than static.
I was also thinking of getting one of those silicone buckets from the dollar store, place stuff inside, and place that inside the cardboard lined can.
I know of no ferrous tape I can use for the can.
Also, I did take a jumper wire from the can lid to the side of the can to ground the lid to the can.
Bad idea or no?
1" of cardboard is a lot of cardboard and doesn't leave much room in the can.
What about items in plastic containers or cardboard boxes inside the cardboard lined can?
My can sits on a concrete floor. It is an old house too so not sure if there is rebar or anything in it.
What if you put a strong magnet stuck to the inside bottom of the lid?
Any effect with that?
Thanks for this great suggestion! I may have a suggestion for improvement. Instead of using aluminum foil, buy a very thin flat aluminum baking sheet - those that are the weight of a pie tin. Then cut the sheet close to the size of the ammo box, but a little bigger on both sides and one end. Take the lid off the can and mold the baking sheet to fit the inside of the lid after snugging one end under the hinge part. If you are careful, you can get it to cover the entire lid over the rubber gasket. It will work just like your foil, but the baking sheet is tougher and doesn't tear nearly so easily. Your idea and thinking, the baking sheet is just tougher than the foil! Thanks again!
Outstanding
Thank you!
Thanks!!
Thanks 🙏
Use Tempest / EMI / RFI gaskets. Probable the conductive polymer / elastomer type, around the top. Do a search on Tempest shielding, you'll see what I mean.
And I love the thought that went into this video.
Looks like a b2b product. Not something consumers have access to.
@@arconreef Electronic supply.
Good idea
Instead several sheets of Reynolds’s Warp/aluminum foil, I suggest you get some inexpensive but thicker aluminum foil from a dollar store, like a Turkey pan, and cut to size and shape. Easier than multiple layers.
I do have a question for your channel? Would it not help the ground the ammo can?
@ 6:31 how could it possibly NOT have continuity. Still a well done video.
LOL
Lead foil; you need to use lead foil, it works 100x better than aluminum foil, and you can line the interior of your electronics cases with it in certain instances.
Thank you sir
a faraday cage doesnt require a water-proof seal. Thats not how the physics works!!!
A faraday cage is called a cage for a reason it could be made out of chain-link it doesn’t have to be sealed it just needs to conduct electricity
You guys are obviously from the Government trying to sabotage these preppers efforts! 😁
His point is that the rubber gasket need not be removed, saving a step.
Me thinky he try to convey water get out then emp pulse stuff get in. Not sure cause eye ham we Todd did.
@@barrykelly2722 I think perhaps you may not be as Todd did as you think you are. It does seem as though he is saying that any tiny pinhole will allow EME in destroying what is trying to be protected inside. I guess the only way to know (if it works) is to test it @styropyro #styropyro
Why are you people suggesting to pay more for another gasket? The idea here is to use aluminum foil, which is already in your pantry. There is no added cost involved. Good lord.
The main reason would be that aluminium foil tears so easily.
Using something like a 400 mesh would give you the protection needed through very wide frequency range and would not tear!
Just put Bounce Sheet in it they absorb all electric statics and plus they smell good.
LOL
Great. And the rubber thing is a gasket
Duel purpose is nice. Water proof and EMP proof case is a good idea. So I like what you got going on. Will this box serve that duel role?
Dual role as i add desiccant for the electronics.
Thanks old man. Best idea I’ve seen yet. Kiss method every time.
Sorry for being late to see this but I understand exactly what you’re saying
get two hand held radios and put one inside and try to communicate with it and see if you can hear it. Wranglestar did something similar but just wrapped the radio in two sheets of foil in a can and that seemed to stop transmission. Would be interesting to see if this configuration would do the same!
CZcams Engineers beg to differ 😂
Yep. Haha I kept my rubber! ...thank you.
Reading comments and yeah.. the hinge pins are all that needs to be making the continuity take place. Additionally.. cell phone? Why? I have sets of walkies, hamms, batteries, walkies with base chargers... AND??? YES, alligator clipped charger for a car battery.
A better solution would be to sand down a ring along the top of the inside of the ammo can, instead of the lip. Then, glue magnets to the aluminum foil to keep it in contact with the metal. That way you don't need to insert aluminum foil between the lid gasket and the container, which will ruin the foil over time as you open and close the lid. The uneven surface of the foil might also compromise the seal.
Excellent. Still water resistant too. Thanks.
Why u need water resistant
@@BlackMamba-lt8oe I know we’re talking about EMC. Water proof is just an additional bonus.
Any suggestions for large items such as my portable generator?
It is what we did in the service to make Emer containers! ( what you said @ first).
While a seal may or may not be better for emp it will 100% help prevent extra humidity and corrosion. I would never ever get rid of the gasket. Maybe get silica packets as well to keep everything inside dry. Also would a plastic liner / containers be as effective as cardboard as an insulator, too thin?
thanks
So what protects the sides and bottom? An emp can go through steel and cardboard.
Gotta love all the prepper armchair EE's on CZcams whose entire EMP knowledge comes from other prepper armchair EE's on CZcams. They probably all have "EMP Shields", too. LOL.
The hinge pins and the latch should be all the continuity needed.
A microwave oven is a Faraday cage...
True. A microwave oven is a Faraday cage that traps RF transmissions internally in order to cook food .
Yes and no (I hate those problems!) . Issue being it's tailored to ~2.4GHz range (not sure of the exact freq).
Put a phone in your microwave and call it. Still comes in. A microwave is NOT a proper faraday cage
@@LoneHawk make a call from within the microwave oven. 😁
Unless it's a cheap one. I remember at hp they were tested once a year and some of them failed and got tossed. 😜
I just looked up if you have a gun safe it can act as a faraday cage and that's where I have my radios
Yes if you seal the door properly
All you really need to do is sand down the paint on the hinge pins and the inside of the hinge in the lid. There you have your continuity and the metal makes the faraday cage.
Unplug your microwave it's a faraday cage. To test call your cell phone in microwave if it doesn't work faraday cage is working
His point was I think that it could be waterproof also
Just use EMC Foam.. Job done...
Where should i attach the grounding wire?
@BC
Thank you . This is just what I needed.
Could you just store your electronics in an old microwave?
Thank you. Your method make more sense to me than removing the seal.
Why not run copper tape around the lid seam instead? That should close off any leaks.
After the EMP you can retrieve your items from your Faraday cage and wait for the 2nd and 3rd strike. GOTCHA!
Always put them right back in.
Whats it for?
You can make a Faraday cage out of 1/4 inch screen.
Good video. A few points of discussion.
1. Since you're sending down to bare metal, you've got to watch out for rust.
2. Don't measure continuity from foil to foil. Measure it from foil to can.
3. How are you going to test to see if this actually works, instead of just guessing that it will work?
4. What would you suggest storing in a can this size?
Plenty of important things fit in a can of this size. Shall I list examples ?
4. Battery banks, torches, phones, small radios, speakers, other small electronics, multi meter, Geiger counter etc
3. one simple way is that you can put your phone inside of it and then try to call it with another phone (with cellular and Wi-Fi calling through an app). If you hear your phone ring inside, it doesn't work. Or put a Bluetooth speaker inside and see if the music continues to play from your phone. O
Be sure to use raw foil not grill foil that has a Teflon coating on one side. It will not conduct properly.
Why not use lead?
What are we trying to protect here?
I too foundthe aluminum foil idea was stupid...I kept my rubber gasket and wrapped it in EMF tape, I bent the retaining lip out so I could put the wrapped gasket back in the groove and then bent the retaining lip back in.
Rather than using aluminum foil. Wouldn't it be better to use aluminum duct work tape. Because each layer of the aluminum tape stick together. Then make connection
simply tape the outer edges with conductive tape and you're done ;). not bad idea though.
Or you could go to the $ store and get some aluminum baking bags. Put your stuff in there, roll and crimp the top and then put in the ammo box.
OK I agree that pulling the rubber seal is not conducive to a can that seals, that is not what makes a Faraday cage function. EMP waves are similar to radio waves as in they are a size or shape. That shape can not go through any gap like water, think square peg in a round hole. This is why many Faraday cages are made from conductive wire mesh. The aluminum foil is a simple cheap solution, you can also order foil that is essentially 8-10 layers thick in one sheet and it's way tougher and reusable more so than the common household heavy stuff. Just to clarify, the continuity test performed in this video really did not show or prove anything more than aluminum foil conducts electricity and so does the bare steel can. To actually check continuity you would need one lead on the can (bare steel)and one on the foil, but again this proves nothing as far as effectiveness as a Faraday cage.
Or, through your cell phone in your cage and call it. If you hear it ring, your cage needs work.
@@shanhutchison7332 The 'gotcha' there is you're only testing at a single frequency whereas an EMP (from what I understand) is very broadband.
But to you point, a heck of a lot better than using an ohm meter for higher frequencies! :)
@@Mark-hb5zf I have read the freq range depends on the source.
@@shanhutchison7332 Shan, I think the take-away here is probably a person should shoot for a 100% RF seal to cover all the bases. As they say...'DC to daylight'. That would be my goal, anyways. Almost easier to go for a simple 100% seal (i.e. the paint can lid) than a piecemeal approach.
@@Mark-hb5zf I'm in agreement on that.
Ok, so where's the part where I'm "doing it wrong"?
You should test for continuity between lid and base, foil and base, and lastly foil and lid. You need continuity across all three.
Waiting for the invasion? Lol
Someone school me. What's are you putting in there? Yes, I have a cell phone, but I carry it with me. Am I going to have time to put it in there before an EMP? It seems whatever you put in there needs to be in there before any EMP, so whatever it is isn't in daily use.
And if I put my phone in there, who am I going to call after the EMP?