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Subject: Re: {5126} Re: {5085} the best way to find digital recorders
From: cptkaos <reco..._at_aol.com>
To: TSCM-L Professionals List <tscm-..._at_googlegroups.com>
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Out of curiousity I took my CPM700 and the magnetic probe and played
around with an Olympus digital audio recorder. The receiver didn't
register much of anything while the recorder was off. When it was
recording there was a definate signature, but nothing really
distinguishable from other similar type objects and electronics
nearby. I suppose if it was hidden on a bookshelf amongst books and no
other metallics close by it would be obvious. But, the CPM700 really
sang when the recorder was on standby. It gave a very high pitch noise
like a fly on meth buzzing around. That was very different than
anything else I've ever heard with it. Probe had to be within three
inches to register.
On Oct 24, 6:09=A0pm, "James M. Atkinson" <j..._at_tscm.com> wrote:
> A NJLD will provide unreliably results, and a high probability of a
> missed eavesdropping device.
>
> A spread spectrum NLJD will give better results, and a broad band
> "chirped" or "swept" NLJD will give even better results.
>
> If you can use an spectrum analyzer that =A0has a "discontinuous sweep
> generator" =A0as part of the spectrum analyzer then you can use the
> spectrum analyzer itself as an NLJD and there will be zero reason to
> haul a NLJD to the job site. The ESA-E is a good example of this where
> you =A0can illuminate at one frequency, and have the SA display only the
> harmonics of where you are illuminating, and give you audio of the
> signal via the Y/Z axis output.
>
> It is pretty cool to turn a spectrum analyzer into the the
> Mother-of-all-NLJD's
>
> -jma
>
>
>
>
>
> Humberto Sodre wrote:
> > James,
> > The best way to find a digital recorder or any device that is not
> > broadcasting an RF signal with good intensity, is not to use a
> > non-linear junction detector?
> > Humberto Rigotti
> > 2010/10/24 James M. Atkinson <j..._at_tscm.com <mailto:j..._at_tscm.com>>
>
> > =A0 =A0 The loop antenna that you describe will help a little, but as t=
he
> > =A0 =A0 frequencies get lower and lower the geometry of the antenna sta=
rts
> > =A0 =A0 getting cumbersome, things start getting larger, and is you use=
a
> > =A0 =A0 sideband antenna is is very easy to saturate the entire band th=
at
> > =A0 =A0 you are trying to filter, the specific frequency you are seekin=
g
> > =A0 =A0 is not finely dialed in, and it can be tricky to use for this.
>
> > =A0 =A0 Yes, the loop and bandpass filter will work, and I have used th=
em
> > =A0 =A0 in the past like this. But I got vastly better results when I
> > =A0 =A0 wound a single bar antenna of a very specific frequency, and tu=
nes
> > =A0 =A0 it so that essentially it was a huge filter itself. Then I ran =
it
> > =A0 =A0 into a small concentrator ring inside the frequency specific
> > =A0 =A0 antenna, and then =A0outside of the antenna passed the signal i=
nto a
> > =A0 =A0 BPF attached to a ultra-low noise pre-amplifier.
>
> > =A0 =A0 cptkaos wrote:
> >> =A0 =A0 How effective would a bandpass filter (say 32.0 KHz - 32.9 KHz=
) be
> >> =A0 =A0 when used with a loop antenna with the range of 20 Hz to 50 KH=
z?
>
> >> =A0 =A0 On Oct 18, 2:51 pm, "James M. Atkinson" <j..._at_tscm.com> <mailt=
o:j..._at_tscm.com> wrote:
>
> >>> =A0 =A0 The optimal electronic way is to use a magnetic antenna, in t=
he form of
> >>> =A0 =A0 a small loop of ferrite core with a very sharp bandpass filte=
r at 32.768
> >>> =A0 =A0 kHz. A good rule is that if you can "hear" the timing crystal=
on a
> >>> =A0 =A0 digital from 2 feet away you should be able to "hear" any mag=
netic
> >>> =A0 =A0 radiation coming off a digital recorder.
>
> >>> =A0 =A0 A very sophisticated digital recorder that presents miniscule=
amounts of
> >>> =A0 =A0 RF energy will often provide a considerable magnetic signal i=
f you know
> >>> =A0 =A0 what to watch for.
>
> >>> =A0 =A0 The spy is going to deal with a very large and very heavy enc=
losure to
> >>> =A0 =A0 keep this leakage down, but since most spies obsess on keepin=
g their
> >>> =A0 =A0 devices small they compromise the detection of magnetic signa=
ls.
>
> >>> =A0 =A0 I have some very nice stick antenna's that I have made that a=
re resonant
> >>> =A0 =A0 right at 32.768 kHz, and they are easy enough to build and im=
pedance
> >>> =A0 =A0 match to a 50 ohm filter, and then to a 50 ohm pre-amp, but g=
et the
> >>> =A0 =A0 preamp well away from the antenna and use double shielded cab=
les for
> >>> =A0 =A0 everything. =A0It does involve thousands of loops of wire, so=
me careful
> >>> =A0 =A0 use of capacitors, a ferrite loop, and a piston cap to settle=
it right
> >>> =A0 =A0 on frequency.
>
> >>> =A0 =A0 -jma
>
> >>> =A0 =A0 David Rom wrote:
>
> >>>> =A0 =A0 Hi TSCM experts
>
> >>>> =A0 =A0 what is the best way to fins digital recorders in while we s=
weep a room?
>
> >>>> =A0 =A0 David Rom
>
> >>>> =A0 =A0 GD Intelligence Security LTD.
>
> >>>> =A0 =A0 On Sat, Oct 2, 2010 at 5:54 PM, <soca..._at_aol.com <mailto:soc=
a..._at_aol.com>
> >>>> =A0 =A0 <mailto:soca..._at_aol.com>> wrote:
>
> >>>> =A0 =A0 =A0 =A0 =A0 Bug Hunting with Anritsu's Spectrum Master=EF=BF=
=BD
>
> >>>> =A0 =A0 =A0 =A0http://www.youtube.com/watch?v=3DjGv3nNSIsfo--
> >>>> =A0 =A0 =A0 =A0 You received this message because you are subscribed=
to the
> >>>> =A0 =A0 =A0 =A0 Granite Island Group "TSCM-L Professionals List" gro=
up which is
> >>>> =A0 =A0 =A0 =A0 the oldest, and the largest TSCM group on Earth. To =
post to this
> >>>> =A0 =A0 =A0 =A0 group, send E-Mail to TSCM-..._at_googlegroups.com <mai=
lto:TSCM-..._at_googlegroups.com>
> >>>> =A0 =A0 =A0 =A0 <mailto:TSCM-..._at_googlegroups.com>, to contact the l=
ist owner
> >>>> =A0 =A0 =A0 =A0 and moderator please send an E-Mail message to j..._at_=
tscm.com <mailto:j..._at_tscm.com>
> >>>> =A0 =A0 =A0 =A0 <mailto:j..._at_tscm.com>.
>
> >>>> =A0 =A0 =A0 =A0 This group is sponsored by Granite Island Group
> >>>> =A0 =A0 =A0 =A0http://www.tscm.com/toimprove the profession of hunti=
ng spies,
> >>>> =A0 =A0 =A0 =A0 and to educate others in the craft of technical
> >>>> =A0 =A0 =A0 =A0 counter-intelligence. Granite Island Group performs =
bug sweeps
> >>>> =A0 =A0 =A0 =A0 like it's a full contact sport; we take no prisoners=
, we don't
> >>>> =A0 =A0 =A0 =A0 play fair, and we give no quarter. Our professional =
goal is to
> >>>> =A0 =A0 =A0 =A0 simply, and completely stop the spy.
>
> >>>> =A0 =A0 =A0 =A0 Granite Island Group Offers World Class, Professiona=
l, Ethical,
> >>>> =A0 =A0 =A0 =A0 and Competent Bug Sweeps, and Wiretap Detection usin=
g
> >>>> =A0 =A0 =A0 =A0 Sophisticated Laboratory Grade Test Equipment.
>
> >>>> =A0 =A0 --
> >>>> =A0 =A0 You received this message because you are subscribed to the =
Granite
> >>>> =A0 =A0 Island Group "TSCM-L Professionals List" group which is the =
oldest,
> >>>> =A0 =A0 and the largest TSCM group on Earth. To post to this group, =
send
> >>>> =A0 =A0 E-Mail to TSCM-..._at_googlegroups.com <mailto:TSCM-..._at_googleg=
roups.com>, to contact the list owner and
> >>>> =A0 =A0 moderator please send an E-Mail message to j..._at_tscm.com <ma=
ilto:j..._at_tscm.com>.
>
> >>>> =A0 =A0 This group is sponsored by Granite Island Grouphttp://www.ts=
cm.com/<
http://www.tscm.com/>
> >>>> =A0 =A0 to improve the profession of hunting spies, and to educate o=
thers in
> >>>> =A0 =A0 the craft of technical counter-intelligence. Granite Island =
Group
> >>>> =A0 =A0 performs bug sweeps like it's a full contact sport; we take =
no
> >>>> =A0 =A0 prisoners, we don't play fair, and we give no quarter. Our
> >>>> =A0 =A0 professional goal is to simply, and completely stop the spy.
>
> >>>> =A0 =A0 Granite Island Group Offers World Class, Professional, Ethic=
al, and
> >>>> =A0 =A0 Competent Bug Sweeps, and Wiretap Detection using Sophistica=
ted
> >>>> =A0 =A0 Laboratory Grade Test Equipment.
>
> >>> =A0 =A0 --
> >>> =A0 =A0 James M. Atkinson
> >>> =A0 =A0 President and Sr. Engineer
> >>> =A0 =A0 Granite Island Group
> >>> =A0 =A0 jm..._at_tscm.comhttp://www.tscm.com/ <mailto:jm..._at_tscm.comhttp=
://www.tscm.com/>- Hide quoted text -
>
> >>> =A0 =A0 - Show quoted text -
>
> > =A0 =A0 --
> > =A0 =A0 James M. Atkinson
> > =A0 =A0 President and Sr. Engineer
> > =A0 =A0 Granite Island Group
> > =A0 =A0 j..._at_tscm.com <mailto:j..._at_tscm.com>
> > =A0 =A0http://www.tscm.com/
>
> --
> James M. Atkinson
> President and Sr. Engineer
> Granite Island Group
> jm..._at_tscm.comhttp://www.tscm.com/- Hide quoted text -
>
> - Show quoted text -
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Subject: Re: {5085} the best way to find digital recorders
From: cptkaos <reco..._at_aol.com>
To: TSCM-L Professionals List <tscm-..._at_googlegroups.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
How effective would a bandpass filter (say 32.0 KHz - 32.9 KHz) be
when used with a loop antenna with the range of 20 Hz to 50 KHz?
On Oct 18, 2:51=A0pm, "James M. Atkinson" <j..._at_tscm.com> wrote:
> 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. =A0It 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, <soca..._at_aol.com
> > <mailto:soca..._at_aol.com>> wrote:
>
> > =A0 =A0 =A0 Bug Hunting with Anritsu's Spectrum Master=EF=BF=BD
>
> > =A0 =A0http://www.youtube.com/watch?v=3DjGv3nNSIsfo--
> > =A0 =A0 You received this message because you are subscribed to the
> > =A0 =A0 Granite Island Group "TSCM-L Professionals List" group which is
> > =A0 =A0 the oldest, and the largest TSCM group on Earth. To post to thi=
s
> > =A0 =A0 group, send E-Mail to TSCM-..._at_googlegroups.com
> > =A0 =A0 <mailto:TSCM-..._at_googlegroups.com>, to contact the list owner
> > =A0 =A0 and moderator please send an E-Mail message to j..._at_tscm.com
> > =A0 =A0 <mailto:j..._at_tscm.com>.
>
> > =A0 =A0 This group is sponsored by Granite Island Group
> > =A0 =A0http://www.tscm.com/to improve the profession of hunting spies,
> > =A0 =A0 and to educate others in the craft of technical
> > =A0 =A0 counter-intelligence. Granite Island Group performs bug sweeps
> > =A0 =A0 like it's a full contact sport; we take no prisoners, we don't
> > =A0 =A0 play fair, and we give no quarter. Our professional goal is to
> > =A0 =A0 simply, and completely stop the spy.
>
> > =A0 =A0 Granite Island Group Offers World Class, Professional, Ethical,
> > =A0 =A0 and Competent Bug Sweeps, and Wiretap Detection using
> > =A0 =A0 Sophisticated Laboratory Grade Test Equipment.
>
> > --
> > You received this message because you are subscribed to the Granite
> > Island Group "TSCM-L Professionals List" group which is the oldest,
> > and the largest TSCM group on Earth. To post to this group, send
> > E-Mail to TSCM-..._at_googlegroups.com, to contact the list owner and
> > moderator please send an E-Mail message to j..._at_tscm.com.
>
> > This group is sponsored by Granite Island Grouphttp://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.comhttp://www.tscm.com/- Hide quoted text -
>
> - Show quoted text -
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From: "TSCM/SO Group" <Mit..._at_tscmusa.com>
To: <tscm-..._at_googlegroups.com>
References: <AANLkTimw2PJU7FqJxNZ5GLO57gB0=_bb9qCyzDs92_eR_at_mail.gmail.com>
Subject: RE: [TSCM-L] {5085} the best way to find digital recorders
Date: Fri, 15 Oct 2010 17:22:07 -0500
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A ladder and a flashlight work GREAT!
Mitch Davis
TSCM/Special Operations Group
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Nashville,TN 37203 USA
615 251 0441
Fax 615 523 0300
mit..._at_tscmusa.com
www.tscmusa.com
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******************************
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-----Original Message-----
From: David Rom [mailto:da..._at_gdis.co.il]
Sent: Sunday, October 03, 2010 3:23 AM
To: tscm-..._at_googlegroups.com
Subject: [TSCM-L] {5085} the best way to find digital recorders
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> wrote:
Bug Hunting with Anritsu's Spectrum MasterT
http://www.youtube.com/watch?v=jGv3nNSIsfo
--
You received this message because you are subscribed to the Granite
Island Group "TSCM-L Professionals List" group which is the oldest, and the
largest TSCM group on Earth. To post to this group, send E-Mail to
TSCM-..._at_googlegroups.com, to contact the list owner and moderator please
send an E-Mail message to jm..._at_tscm.com.
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.
--
You received this message because you are subscribed to the Granite Island
Group "TSCM-L Professionals List" group which is the oldest, and the largest
TSCM group on Earth. To post to this group, send E-Mail to
TSCM-..._at_googlegroups.com, to contact the list owner and moderator please
send an E-Mail message to jm..._at_tscm.com.
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.
Received on Sat Mar 02 2024 - 00:57:24 CST