They also do a sweet job detecting key stroke loggers.
-jma
ber..._at_netaxs.com wrote:
> Do all digital audio recorders use a crystal oscillator at 32.768 KHz?
> Why wouldn't a spy simply change the oscillator frequency to evade
> detection?
>
> Will the detection method described below work for all the small USB
> flash drive audio recorders flooding the market (see below URL) from
> China? I've tested couple of these and they work surprisingly well
> given their cost and size, however I've not measured their emissions.
>
> http://www.google.com/products?hl=en&expIds=17259,22713,26637,26992,27143,27150,27157&sugexp=ldymls&xhr=t&q=usb+flash+drive+audio+recorder&cp=26&um=1&ie=UTF-8&sa=N&tab=wf
>
>
> -Ed
>
>
> Quoting "James M. Atkinson" <jm..._at_tscm.com>:
>
>> The optimal electronic way is to use a magnetic antenna, in the form
>> of a small loop of ferrite core with a very sharp bandpass filter at
>> 32.768 kHz. A good rule is that if you can "hear" the timing crystal
>> on a digital from 2 feet away you should be able to "hear" any
>> magnetic radiation coming off a digital recorder.
>>
>> A very sophisticated digital recorder that presents miniscule amounts
>> of RF energy will often provide a considerable magnetic signal if you
>> know what to watch for.
>>
>> The spy is going to deal with a very large and very heavy enclosure
>> to keep this leakage down, but since most spies obsess on keeping
>> their devices small they compromise the detection of magnetic signals.
>>
>> I have some very nice stick antenna's that I have made that are
>> resonant right at 32.768 kHz, and they are easy enough to build and
>> impedance match to a 50 ohm filter, and then to a 50 ohm pre-amp, but
>> get the preamp well away from the antenna and use double shielded
>> cables for everything. It does involve thousands of loops of wire,
>> some careful use of capacitors, a ferrite loop, and a piston cap to
>> settle it right on frequency.
>>
>> -jma
>>
>>
>>
>> David Rom wrote:
>>> Hi TSCM experts
>>>
>>> what is the best way to fins digital recorders in while we sweep a
>>> room?
>>>
>>> David Rom
>>>
>>> GD Intelligence Security LTD.
>>>
>>>>
>>>
>>>
>>>
>>> On Sat, Oct 2, 2010 at 5:54 PM, <socal..._at_aol.com
>>> <mailto:socal..._at_aol.com>> wrote:
>>>
>>>
>>> Bug Hunting with Anritsu's Spectrum Master™
>>>
>>>
>>> http://www.youtube.com/watch?v=jGv3nNSIsfo --
>>> You received this message because you are subscribed to the
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>>> You received this message because you are subscribed to the Granite
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>>>
>>> This group is sponsored by Granite Island Group http://www.tscm.com/
>>> to improve the profession of hunting spies, and to educate others in
>>> the craft of technical counter-intelligence. Granite Island Group
>>> performs bug sweeps like it's a full contact sport; we take no
>>> prisoners, we don't play fair, and we give no quarter. Our
>>> professional goal is to simply, and completely stop the spy.
>>>
>>> Granite Island Group Offers World Class, Professional, Ethical, and
>>> Competent Bug Sweeps, and Wiretap Detection using Sophisticated
>>> Laboratory Grade Test Equipment.
>>
>> --
>> James M. Atkinson
>> President and Sr. Engineer
>> Granite Island Group
>> jm..._at_tscm.com
>> http://www.tscm.com/
>>
>>
>
>
>
--
James M. Atkinson
President and Sr. Engineer
Granite Island Group
jm..._at_tscm.com
http://www.tscm.com/
Received on Sat Mar 02 2024 - 00:57:24 CST