Aluminium Foil around Mobile Phone... what will happen ?
Skybuck Flying
I just had an idea how to test the jamming/blocking strength of Aluminium
Foil.
One of these days I will go to my moather and ask her for her mobile phone
and then I will wrap it in aluminium foil.
And then I will tell (command) her (!) to call herself on the mobile phone !
:)
And then I/we will see what happens.
I hope the aluminium doesn't start burning like in a Microwave ?
What do you guys think will happen ?
1. Will the signal be blocked or will it still penetrate ?
2. Will something weird happen ?
(If it does work I will wrap my money inside aluminium foil just to prevent
any possibility of detection :PPP ;) :) )
Goodbye,
Skybuck.
Joel Koltner
news:c6ee8$496f8a89$d5337e4d$18...@cache1.tilbu1.nb.home.nl...
> What do you guys think will happen ?
> 1. Will the signal be blocked or will it still penetrate ?
The signal will be blocked.
You don't even need to call the phone to demonstrate the shielding
effectiveness -- just leave it wrapped up for 5 minutes, pull it out, and
you'll see that the phone lost its signal to the base.
> 2. Will something weird happen ?
No.
> (If it does work I will wrap my money inside aluminium foil just to prevent
> any possibility of detection :PPP ;) :) )
Some RF ID systems use low enough freuqencies (~135kHz) that a single layer of
aluminum foil probably won't be completely effective (whereas it certainly is
at the 800MHz/1.8GHz frequencies that cell phones use). I don't know what
money uses, though...
John Larkin
<Blood...@hotmail.com> wrote:
>Hello,
>
>I just had an idea how to test the jamming/blocking strength of Aluminium
>Foil.
>
>One of these days I will go to my moather and ask her for her mobile phone
>and then I will wrap it in aluminium foil.
>
>And then I will tell (command) her (!) to call herself on the mobile phone !
>:)
>
>And then I/we will see what happens.
>
>I hope the aluminium doesn't start burning like in a Microwave ?
>
>What do you guys think will happen ?
>
>1. Will the signal be blocked or will it still penetrate ?
If you wrap the foil tight, blocked.
>
>2. Will something weird happen ?
I think something weird just did happen.
>
>(If it does work I will wrap my money inside aluminium foil just to prevent
>any possibility of detection :PPP ;) :) )
How much allowance does she give you?
John
Dave Platt
In article <c6ee8$496f8a89$d5337e4d$18...@cache1.tilbu1.nb.home.nl>,
Skybuck Flying <Blood...@hotmail.com> wrote:
>One of these days I will go to my moather and ask her for her mobile phone
>and then I will wrap it in aluminium foil.
>
>And then I will tell (command) her (!) to call herself on the mobile phone !
>:)
>
>And then I/we will see what happens.
>
>I hope the aluminium doesn't start burning like in a Microwave ?
A microwave has somewhere around 1000 watts of power. A cellphone
puts out less than a watt at full power. It's nowhere near enough
power to create arcing or burning of the metal.
[Most probably, the "money burning up" you've seen described, when
people put modern bills in a microwave oven, does *not* indicate that
there's an RFID chip in the money. Rather, there's a simple
metal-foil strip, which doesn't have any tracking information in it at
all - it's just enough to allow a real Euro to be distinguished from a
counterfeit that has no foil strip.
There has been some discussion of putting RFID chips in the
highest-value Euro notes, in order to deter counterfeiting. I
haven't seen any *credible* reports that there are such chips in the
smaller-value (e.g. 20 and 50 Euro) bills. The chips aren't cheap
enough to use in this way yet.]
>What do you guys think will happen ?
The cellphone will very probably not "hear" signals from the cellphone
tower, and it'll go into a "zero bars, no service" state.
There is *some* possibility that you will damage your mother's
microwave by doing this. Wrapping the phone in foil will create
something vaguely like a short circuit across the phone's internal
antenna. If the phone doesn't have high-SWR protection in its
transmit circuitry, and if it tries to send out a full-power signal to
query a cellphone tower, the resulting high SWR might overload the
phone's transmitter power amp and damage it.
Chances are, though that the phone will probably be OK.
>1. Will the signal be blocked or will it still penetrate ?
Assuming that the foil is wrapped around the phone and "seamed shut",
it'll serve as a very effective shield against RF at cellphone levels.
The cellphone will go "no service", and any attempt to phone it should
get you a not-in-service announcement.
>(If it does work I will wrap my money inside aluminium foil just to prevent
>any possibility of detection :PPP ;) :) )
"Oh, boy! My detector shows that the guy standing right next to me
actually has money in his pocket! I'll alert the Trilateral
Commission and the Illuminati immediately!"
[If my sarcasm isn't adequately clear - I think you're making a great
deal of fuss over a non-problem, based on your leaping to incorrect
conclusions based on inadequate information and understanding.]
--
Dave Platt <dpl...@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
Paul Hovnanian P.E.
>
If you think wrapping aluminum foil around a cell phone is good for
eliminating noise, you should try wrapping a bunch of it around your
keyboard.
--
Paul Hovnanian mailto:Pa...@Hovnanian.com
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Excuse me for butting in, but I'm interrupt-driven.
ingvald44
(on)wijs man
nothing, everyting works fine aluminium has no matter for that.
But, put your gsm in a tin can (from cookies) and he will not work anymore!
musty847
permanent or if not how long will it last?
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John Tserkezis
> So I see the consequence is the phone's signal being damaged.. Is this
> permanent or if not how long will it last?
It's hard to say, affecting the tuning of an antenna like that is
difficult to gauge at best without actually measuring, and more
difficult to predict if it's going to cause damage. Some transmitters
are better at dealing with high VSWR than others.
Either way, isn't the foil supposed to go around your *head* rather
than the phone?