Re: GSM Devices Hidden Inside Household Items
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Subject: Re: GSM Devices Hidden Inside Household Items
Date: Sat, 10 Mar 2007 18:14:36 -0800
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James said...
> To help push the GSM
> device into revealing itself you can (where it it
> legal to do so) jam the GSM bands to make the
> phone think that it has lost connection, and thus
> reveal itself when it tries to check in again with the base.
No...it doesnt work like that !
The GSM-phone will NOT SEND out anything at all after
it has lost connection ! or when it was jammed (wich is the same)
All it will do when it does not find a valid network..is
scan all the channels until it does find a good channel
belonging to a valid network.
I have tried what you said..already 3 years ago
and it is confirmed by the GSM-standard
and it does not work.
It would be the easyest trick but sad enough its a nope.
I tell you something...even after it finds a network again
it will still not send out anything at all if the service area
is still the same (service-area can be sized 1/5 th of a city)
The only time a GSM cellphone sends out a signal
(apart from a real call ofcourse)
1)
Is when it sees a new service-area with higher-better
signals levels (other then the last one it was locked to)
2)
When the periodic update timer has reached itīs point
for example if that timer was 2 hours...and there has not
been a call for the last 2 hours (wich would have reset the timer)
then it will send a single-shot burst to let the network know
that itīs still alive.
--------------------------------------------------------------------------
Jamming or loss of network.
does NOT cause any reaction from any GSM-phone.
--------------------------------------------------------------------------
The whole idea of periodic update signals is exactly for that
...to notify the network of the where abouts of the phone
and it is done every time the periodic-update-timer
wich is inside the mobile phone has reached its maximum
If a phone would not move...and make or receive no calls
...then the network would not know where the phone is
and it would be lost and it would be unreachable.
so it sends out a periodic update signal every so much time
so the network will have a fresh idea of the location of that phone.
Such timer could be 2 hours..so every 2 hours it would
send a burst...the timer is reset by a call or by changing
service-areas ..meaning that after such event it again takes
the full 2 hours before it sends a burst.
A trick that WILL work is the following
>From above you can conclude that it will send out something
when it sees a new and better service-area (with higher levels)
So you could present it such a signal !
You could do that by using a fake basestation/IMSI-catcher
and have such unit present itself as a new and strong service-area
the GSM-phone will then attempt to handdshake that basestation
and will send out signals.
I have described that trick already 2 years ago...you could purchase
a GSM-tester..do some modifications to it so that it will work off-the
air
(instead of direct cabling) increasae the power-output and reception
sensitivity of that GSM-tester (using a GSM range-extender)
then bring it into the area/room ...make shure that every inch
of that room gets filled with a higher level then the local(real)
signal
and voila...the unknown GSM-bug will lock to your fake basestation
the GSM-tester will tell you the number of the phone and other details
Cost of such a installation estimated at 20000 U$.
> Another option is to use an NLJD that uses
> multiple illumination frequencies so that you are
> targeting the filters on the cell phone.
> (hint: over 18 GHz). You then illuminate the
> target in the frequency bands in which the phone
> operates, and then at multiples of the bandpass
> of the device. ..............
Why so complicated ? .
...just use the NLJD
and find anything that contains Non-Linear-Junctions
cellphones are loaded with them..there housing is
transparent enough...loads of plastics and holes
no need to bother about filters and multiple freqīs...etc
Maybe you get some effects when hitting filter-frequencies
but that seems unneccesary...by the way they are all
SAW-filters...with 10īs of Mhz bandwidts..there are
no coils so resonating is difficult...but unneccesary anyway.
The unit that i have thought of (designed) is nothing
more then a Widebanddetector with GSM/CDMA filters
a piece of software plots the signalstrengths
against time on a laptop.
After you come back you simply look for repeating
periodic update signals...thats all.
contranl
Received on Sat Mar 02 2024 - 00:57:20 CST
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