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Faraday Bags - RF blocking for home electronics

Posted on 09/18/2023 5:40:51 AM PDT by Scooter100

Some questions about Faraday Bags.


TOPICS: Chit/Chat; Miscellaneous; Science
KEYWORDS: faraday; prepping
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To: dinodino

And if you see a couple of big black vehicles outside...turn the microwave on.


41 posted on 09/18/2023 7:05:08 AM PDT by SpokeshaveReturns (Proud Boys, Angry Dads and curmudgeons.)
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To: Scooter100

A well functioning Faraday cage will sever communications between phone and tower. As long as the device is turned on it will continue to seek an active access point until it either finds one or exhausts its battery.

I shut my devices down before sealing in the cage.


42 posted on 09/18/2023 7:06:31 AM PDT by rockrr ( Everything is different now... )
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To: Blueflag

The old terrestrial MW networks of the telcos were C-band 6/4 Ghz. They used to use passive plano-reflectors for terrain problems. Thus, I can’t see how 5G 6G, at even higher mmW frequencies, will penetrate a sealed, heavy-duty enclosure, let alone a Faraday bag. Its been a long while since my tech days, so I may be out of touch.


43 posted on 09/18/2023 7:07:19 AM PDT by Scooter100
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To: Towed_Jumper

I’ve just been turning it off, but you may have a valid point for additional safety in the Airplane Mode. Tks.


44 posted on 09/18/2023 7:09:11 AM PDT by Scooter100
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To: Scooter100

Turn the phone off first. I have in the past wrapped mine in tinfoil which also works but I turn it off first. Never had a problem.


45 posted on 09/18/2023 7:21:05 AM PDT by Georgia Girl 2 (The only purpose of a pistol is to fight your way back to the rifle you should never have dropped)
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To: Scooter100

“Exactly, I clear background apps, push the off button, and into the bags. Viola!”

WOW - Impressive… you do all that and get a stringed instrument that is slightly larger than a violin with a lower, richer sound???? Absolutely effin’ amazing!!!

BTW - the French word you really wanted was “Voila!” - meaning “there you are.”


46 posted on 09/18/2023 7:22:17 AM PDT by T-Bird45 (It feels like the seventies, and it shouldn't. )
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To: Scooter100

Yep, and that’s why Wi-Fi 6e is “son, you’re on your own.” it’s shared spectrum.

Telco/cellular C-band is still ‘owned’ for military RADAR, and unless you buy an expensive ongoing license, your zippy new C-band CBRS private 5G network can endure a lot of interference from nearby permitted use, even other private 5G networks, and it’s “tough noogies” for you.

Cellular radios and towers are VERY low power compared to most other applications. So yeah, *IF* you put your smart phone into a microwave oven your RSRP/RSSI/RSRQ are so weak/ poor that you’re never gonna connect and you’re likely safe.

The same is true for an old metal Charles Chips can.

All depends on what threat you are protecting yourself and your devices from.


47 posted on 09/18/2023 7:26:05 AM PDT by Blueflag (Res ipsa loquitur: ad ferre non, velit esse sine defensione)
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To: Towed_Jumper

AS long as YOUR airplane mode also turns off Bluetooth and NFC.


48 posted on 09/18/2023 7:27:32 AM PDT by Blueflag (Res ipsa loquitur: ad ferre non, velit esse sine defensione)
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To: SheepWhisperer

Perfect ...


49 posted on 09/18/2023 7:29:04 AM PDT by Blueflag (Res ipsa loquitur: ad ferre non, velit esse sine defensione)
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To: Georgia Girl 2
Interesting RF/EMP tests on various devices like phones and laptops at https://www.youtube.com/watch?v=ZbHK6Uqmzog, including why I picked a certain type of solar inverter.
50 posted on 09/18/2023 7:31:46 AM PDT by Tell It Right (1st Thessalonians 5:21 -- Put everything to the test, hold fast to that which is true.)
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To: Does so

Doesnt work. Dont believe me....put a portable FM radio in it tuned to your favorite station. Then try AM.


51 posted on 09/18/2023 7:32:07 AM PDT by RFEngineer
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To: RFEngineer

I’d appreciate your take on the video I posted in comment # 50 about RF tests on various devices, including over air tests and on cable tests. Is this legit or just a sales gimmick?


52 posted on 09/18/2023 8:14:49 AM PDT by Tell It Right (1st Thessalonians 5:21 -- Put everything to the test, hold fast to that which is true.)
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To: RFEngineer

First I’ve heard, but I don’t argue with an engineer!


53 posted on 09/18/2023 8:46:16 AM PDT by Does so ( 🇺🇦...................."Who is Ray Epps?" should be overstamped on every piece of currency.)
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To: Does so; Blueflag

BF had it 100% correct as well. Just saw that post


54 posted on 09/18/2023 9:06:13 AM PDT by RFEngineer
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To: Tell It Right

I can’t tell exactly what waveforms they used and the intensity, but it is generally reasonable to look at susceptibility in this way (conducted and radiated). It’s better if you do it both at the same time, but this is decent info.

I’m not sure this is what they did, but I suspect that it is - but the bottom line is that placing properly rated Metal-Oxide Varistors (MOV’s) or similar device very close to the device on any conductors can be an effective way to protect the device (and some related grounding). Solar Panels have a blocking diode that needs to be protected and can be protected similarly.

Solar panels themselves have some additional vulnerability on the multiple cells, I don’t think this setup would test that issue fully.


55 posted on 09/18/2023 9:12:54 AM PDT by RFEngineer
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To: Ikeon

Sounds right I don’t believe GPS ever shuts down.

Not sure


56 posted on 09/18/2023 10:48:05 AM PDT by Vaduz (....)
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To: Blueflag

To add to that, many communications devices also will lose their minds if not allowed to communicate for too long, and will require a reboot to reinitialize.


57 posted on 09/18/2023 12:56:00 PM PDT by lepton ("It is useless to attempt to reason a man out of a thing he was never reasoned into"--Jonathan Swift)
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