I made a technical error in my comments regarding the DSI product
that I would like to correct.
The tweakable high end bandpass on the DSI product is 500 MHz, not
450 MHz, and you start to get roll off of the filter above 500 MHz.
The -215 dBm minimum detection level is based on an 8 MHz signal
bandwidth, but on wider signals we are talking about a MDL of -240 to
-250 dBm. Same situation with using short-keys on Cryptographic or
COMSEC equipment, or exploitations of the "noise" on the power lines
during various emissions security studies. You can measure deep
inside the noise floor (40, 60, and even 80 dB inside) is you know
about the signal you are looking to measure (or, ahem... exploiit).
-jma
At 02:09 PM 5/12/2007, James M. Atkinson wrote:
>The DSI radios are great units, and you can do all kinds of cool
>stuff with them because of the extremely wide bandwidth, and
>capabilities built into the receivers to do raster analysis.
>
>I like the DSI R-1550 which will give you coverage from 20 Hz to 40
>GHz all in the same system, with a capability to detect and measure
>signals down to -215 dBm, or 40 dB deep into the noise floor (I kid
>you not), but only to -164 dBm without performing a hat trick with
>the noise floor..
>
>The wideband capabilities of the DSI R-1550 give you some very
>interesting capabilities because you have ID bandwidth of 200 MHz,
>and above (on a center frequency of 1450 MHz), so you can tweak the
>radio to give you a bandwidth of over 450 MHz.
>
>They also have a sweet little Raster Analyzer box that does with the
>radio and a nice spread spectrum detection interface as well.
>
>---
>
>If you use a multi channel AD converter for a SDR you can run the
>samplers at a slight time offset from each other to create a spectrum
>that is six times wider then using just a single channel. The coolest
>implementation I have seen of this yet used 24 Analog Devices, 2
>channel AD convertors to provide 48 actual channels which when
>combined give you an instantaneous bandwidth of 3.6 GHz in a single
>box. The only wrinkle is that you end up getting so much information
>that you get the "drinking from a fire hose" problem biting you as
>you can fill a 2 TB hard drive array real quick.
>
>-jma
>
>
>
>
>At 08:40 PM 5/11/2007, coderman wrote:
>
> >On 5/10/07, Nick Named <xxr..._at_twcny.rr.com> wrote:
> > >
> > > Which law enforcement agencies have signals intelligence capability?
> > > The kind of capability TEMPEST was designed to protect against.
> >
> >that's a great question. i hope someone on the list knows the answer...
> >
> >
> > > Is there capability like that in private hands? Could someone do
> > > something like that with a laptop, a directional antenna and
> > > something like gnuradio - http://www.gnu.org/software/gnuradio?
> >
> >Markus Kuhn at Cambridge [0] has built emanations monitoring gear for
> >reading laptop displays at considerable distance [1] using an R-1250
> >[2] (and other hardware, iiirc). this would also be possible with the
> >right RF front ends attached to the nallatech hardware i referenced in
> >another thread. (the GNU radio USRP might be suitable, but the
> >bandwidth limits of that device would be close, or under what was
> >needed for good visual capture)
> >
> >gnu radio does indeed provide some of the base signal processing
> >components that could be used for this purpose, but the hardware, not
> >processing, will likely be the crux.
> >
> >best regards,
> >
> >0. Markus Kuhn
> > http://www.cl.cam.ac.uk/~mgk25/
> >
> >1. Compromising emanations: eavesdropping risks of computer displays
> > http://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-577.html
> >
> >2. Dynamic Sciences R-1250 receiver
> > http://www.cl.cam.ac.uk/~mgk25/r1250/
> >
> >
>----------------------------------------------------------------------------------------------------
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>
----------------------------------------------------------------------------------------------------
World Class, Professional, Ethical, and Competent Bug Sweeps, and
Wiretap Detection using Sophisticated Laboratory Grade Test Equipment.
----------------------------------------------------------------------------------------------------
James M. Atkinson Phone: (978) 546-3803
Granite Island Group Fax: (978) 546-9467
127 Eastern Avenue #291 Web:
http://www.tscm.com/
Gloucester, MA 01931-8008 E-mail: mailto:jm..._at_tscm.com
----------------------------------------------------------------------------------------------------
We perform bug sweeps like it's a full contact sport, we take no prisoners,
and we give no quarter. Our goal is to simply, and completely stop the spy.
----------------------------------------------------------------------------------------------------
Received on Sat Mar 02 2024 - 00:57:17 CST