> I wondered if a similar envelope could protect my phone from being located all the time? And maybe that would also protect the phone from EMPs?
Since phones radiate location on the gigahertz freq, I think there would be no effect by wrapping it with metal etc.
Please do not disclose your Rabdom data
Very good questions. Here’s another.
When making a tinfoil hat, is it shiny side in or shiny side out?
I can dig it up, but the US govt did simulated EMP testing on 19 vehicles. Don't know why 19 instead of 20. When the EMP hit, all of the vehicles stopped running. But, after the EMP, most (17 IIRC) started right back up. Two of them needed electronic parts replaced (engine computer?). It's not as bad on vehicles and computers etc as people think.
Now, the empire's power grids would be TOAST after one good EMP burst 400 miles above Kansas...
Enclosing it in any metal box should prevent the phone from connecting to a tower.
35-year RF design engineer here, with cellular module & antenna design experience.
I wrapped my phone with aluminum foil and then tried to call it. It did not ring.
Turn off the location finder
If you look up ‘Faraday Cage’ you will see that the protection requires a continuous conductive surface that leads to a ground wire for discharging the ‘pulse’. Thus a car fails due to windows and lack of ground. The advice about safety from lightning remains valid as the car’s metal shell (Corvettes need not apply) is acting as a conductor and the strike will do a ‘spark gap’ jump to the ground.
Faraday bags and pouches are a shield for the contents and are limited to protecting more against detection than EMP. They are also limited by practicalities as higher protection (frequency ranges & power) needs bulkier shielding. Also a shield bag sufficient for reduced detection of cell phone will conversely make you unable to use that cell without removing it from said protection.
The rotation of the earth generates power in the north-south power lines. An emp would generate high voltage in these lines.
The effects of an EMP are basically unknown.
Tests have been done, but that was with an X megaton blast Y miles above the target.
What if it was more megatons? Or if the blast was not directly overhead?
Frankly, nobody knows what might happen. It could be like Y2K where there was hysteria and no consequences or it could be like 9/11 where burning fuel weakened a building to the point of collapse.
A car is NOWHERE close to being a faraday cage.
Easy way to protect a phone. Go to some cheap appliance store or Waimart etc and look for a very small ‘microwave’...
Take two phones with you or a friend with a phone.
Put your phone in the small microwave and ask your friend to dial your number.
If the phone rings in the microwave move on to the next one...and repeat.
Here’s one for less than %60 on Amazon:
https://www.amazon.com/s?k=small+microwaves+small+space&i=garden&crid=C1JKQY793ZKV&sprefix=small+microwave%2Cgarden%2C270&ref=nb_sb_ss_ts-doa-p_3_15
Easy way to protect a phone. Go to some cheap appliance store or Waimart etc and look for a very small ‘microwave’...
Take two phones with you or a friend with a phone.
Put your phone in the small microwave and ask your friend to dial your number.
If the phone rings in the microwave move on to the next one...and repeat.
Here’s one for less than $60 on Amazon:
https://www.amazon.com/s?k=small+microwaves+small+space&i=garden&crid=C1JKQY793ZKV&sprefix=small+microwave%2Cgarden%2C270&ref=nb_sb_ss_ts-doa-p_3_15
If the microwave is functioning as a faraday cage the phone inside won’t ring.
For larger things - chicken wire works better than solid metal - that’s the rumor...
To function as a Faraday cage or shield for a given wavelength of electromagnetic radiation, any holes in it need to be smaller than the wavelength of the electromagnetic radiation of interest, and the cage thicker ( skin effect) than the wavelength. That would imply autos would work poorly to shield against EMP from a nuclear device.
“I wondered if a similar envelope could protect my phone from being located all the time? And maybe that would also protect the phone from EMPs? “
Yes, it would protect your phone from being located, but it would also prevent you from receiving any calls or texts while the phone is in the bag.
As for protecting it from EMP, it probably would, but then again, if the cell towers are knocked out by EMP, the phone would be fairly useless. I supposed you would still have your photos though.
Put your phone in an RF bag that you can buy on Amazon. Problem solved.