>From - Sat Mar 02 00:57:24 2024
Received: by 10.150.157.20 with SMTP id f20mr2648811ybe.29.1287959676144;
Sun, 24 Oct 2010 15:34:36 -0700 (PDT)
X-BeenThere: tscm-l2006_at_googlegroups.com
Received: by 10.150.102.24 with SMTP id z24ls3271100ybb.3.p; Sun, 24 Oct 2010
15:34:32 -0700 (PDT)
Received: by 10.150.144.1 with SMTP id r1mr2708780ybd.47.1287959672408;
Sun, 24 Oct 2010 15:34:32 -0700 (PDT)
Received: by 10.220.187.5 with SMTP id cu5mr1502055vcb.23.1287941368836;
Sun, 24 Oct 2010 10:29:28 -0700 (PDT)
Received: by 10.220.187.5 with SMTP id cu5mr1502054vcb.23.1287941368792;
Sun, 24 Oct 2010 10:29:28 -0700 (PDT)
Return-Path: <da..._at_gdis.co.il>
Received: from mail-qy0-f169.google.com (mail-qy0-f169.google.com [209.85.216.169])
by gmr-mx.google.com with ESMTP id j32si1064680vbp.2.2010.10.24.10.29.28;
Sun, 24 Oct 2010 10:29:28 -0700 (PDT)
Received-SPF: neutral (google.com: 209.85.216.169 is neither permitted nor denied by best guess record for domain of da..._at_gdis.co.il) client-ip=209.85.216.169;
Authentication-Results: gmr-mx.google.com; spf=neutral (google.com: 209.85.216.169 is neither permitted nor denied by best guess record for domain of da..._at_gdis.co.il) smtp.mail=da..._at_gdis.co.il
Received: by qyk34 with SMTP id 34so746035qyk.0
for <tscm-..._at_googlegroups.com>; Sun, 24 Oct 2010 10:29:28 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.229.237.129 with SMTP id ko1mr5402477qcb.4.1287941368056; Sun,
24 Oct 2010 10:29:28 -0700 (PDT)
Received: by 10.229.62.155 with HTTP; Sun, 24 Oct 2010 10:29:28 -0700 (PDT)
In-Reply-To: <4CC46666.4080605_at_tscm.com>
References: <AANLkTimw2PJU7FqJxNZ5GLO57gB0=_bb9qCyzDs92_eR_at_mail.gmail.com>
<4CBCA52B.2040402_at_tscm.com>
<1bf9c6d2-d2bd-4436-b8d7-8dbb878cef1c_at_c20g2000yqj.googlegroups.com>
<4CC46666.4080605_at_tscm.com>
Date: Sun, 24 Oct 2010 19:29:28 +0200
Message-ID: <AANLkTinpCF5N7+XjJACxjkB8_Ty1jSE-4i+DtQGhOr5v_at_mail.gmail.com>
Subject: Re: [TSCM-L] {5123} Re: {5085} the best way to find digital recorders
From: David Rom <da..._at_gdis.co.il>
To: tscm-l2006_at_googlegroups.com
Content-Type: multipart/alternative; boundary=0016364ec9bcbc0a4b0493603744
--0016364ec9bcbc0a4b0493603744
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
hi
which part of the OSCOR 5000 full kit can work for this solution?
David Rom
GD Intelligence Security LTD.
Tel: +972-9-8999363,
Fax: +972-3-5422923,
Mobile: +972-52-5577999
>
On Sun, Oct 24, 2010 at 7:01 PM, James M. Atkinson <jm..._at_tscm.com> wrote:
> The loop antenna that you describe will help a little, but as the
> frequencies get lower and lower the geometry of the antenna starts gettin=
g
> cumbersome, things start getting larger, and is you use a sideband antenn=
a
> is is very easy to saturate the entire band that you are trying to filter=
,
> the specific frequency you are seeking is not finely dialed in, and it ca=
n
> be tricky to use for this.
>
> Yes, the loop and bandpass filter will work, and I have used them in the
> past like this. But I got vastly better results when I wound a single bar
> antenna of a very specific frequency, and tunes it so that essentially it
> was a huge filter itself. Then I ran it into a small concentrator ring
> inside the frequency specific antenna, and then outside of the antenna
> passed the signal into a BPF attached to a ultra-low noise pre-amplifier.
>
> cptkaos wrote:
>
> 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 pm, "James M. Atkinson" <j..._at_tscm.com> <j..._at_tscm.com> w=
rote:
>
>
> 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, <soca..._at_aol.com<mailto:soca..._at_aol.com>=
<soca..._at_aol.com>> wrote:
>
>
> Bug Hunting with Anritsu's Spectrum Master=C3=AF=C2=BF=C2=BD
>
>
> http://www.youtube.com/watch?v=3DjGv3nNSIsfo--
> 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
> <mailto:TSCM-..._at_googlegroups.com> <TSCM-..._at_googlegroups.com>, to co=
ntact the list owner
> and moderator please send an E-Mail message to j..._at_tscm.com
> <mailto:j..._at_tscm.com> <j..._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 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 Groupjm..._at_tscm.comhttp://www.tscm.com/- Hide quoted text =
-
>
> - Show quoted text -
>
>
>
> --
> James M. Atkinson
> President and Sr. Engineer
> Granite Island Groupjmatk_at_tscm.comhttp://www.tscm.com/
>
>
--0016364ec9bcbc0a4b0493603744
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">hi=C2=A0<div><br></div><div>which part of the OSCOR 5000 f=
ull kit can work for this solution?</div><div><br></div><div><br clear=3D"a=
ll">David Rom<br><br>GD Intelligence Security LTD.<br><br>Tel: +972-9-89993=
63,=C2=A0=C2=A0 <br>
Fax: +972-3-5422923,=C2=A0 =C2=A0 <br>Mobile: +972-52-5577999<br>><br><b=
r>
<br><br><div class=3D"gmail_quote">On Sun, Oct 24, 2010 at 7:01 PM, James M=
. Atkinson <span dir=3D"ltr"><<a href=3D"mailto:jm..._at_tscm.com">jm..._at_ts=
cm.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
=20
<div bgcolor=3D"#ffffff" text=3D"#000000">
The loop antenna that you describe will help a little, but as the
frequencies get lower and lower the geometry of the antenna starts
getting cumbersome, things start getting larger, and is you use a
sideband antenna is is very easy to saturate the entire band that you
are trying to filter, the specific frequency you are seeking is not
finely dialed in, and it can be tricky to use for this. <br>
<br>
Yes, the loop and bandpass filter will work, and I have used them in
the past like this. But I got vastly better results when I wound a
single bar antenna of a very specific frequency, and tunes it so that
essentially it was a huge filter itself. Then I ran it into a small
concentrator ring inside the frequency specific antenna, and then=C2=A0
outside of the antenna passed the signal into a BPF attached to a
ultra-low noise pre-amplifier.<br>
<br>
cptkaos wrote:
<blockquote type=3D"cite">
<pre>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=C2=A0pm, "James M. Atkinson" <a href=3D"mailto:j.=
.._at_tscm.com" target=3D"_blank"><..._at_tscm.com></a> wrote:
</pre>
<blockquote type=3D"cite">
<pre>The optimal electronic way is to use a magnetic antenna, in the fo=
rm 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 magneti=
c
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 resonan=
t
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. =C2=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:
</pre>
<blockquote type=3D"cite">
<pre>Hi TSCM experts
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>what is the best way to fins digital recorders in while we sweep=
a room?
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>David Rom
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>GD Intelligence Security LTD.
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>On Sat, Oct 2, 2010 at 5:54 PM, <<a href=3D"mailto:soca..._at_ao=
l.com" target=3D"_blank">soca..._at_aol.com</a>
<a href=3D"mailto:soca..._at_aol.com" target=3D"_blank"><mailto:soca..._at_aol=
.com></a>> wrote:
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>=C2=A0 =C2=A0 =C2=A0 Bug Hunting with Anritsu's Spectrum Mas=
ter=C3=AF=C2=BF=C2=BD
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>=C2=A0 =C2=A0<a href=3D"
http://www.youtube.com/watch?v=3DjGv3nNS=
Isfo" target=3D"_blank">
http://www.youtube.com/watch?v=3DjGv3nNSIsfo</a>--
=C2=A0 =C2=A0 You received this message because you are subscribed to the
=C2=A0 =C2=A0 Granite Island Group "TSCM-L Professionals List" gr=
oup which is
=C2=A0 =C2=A0 the oldest, and the largest TSCM group on Earth. To post to t=
his
=C2=A0 =C2=A0 group, send E-Mail to <a href=3D"mailto:TSCM-..._at_googlegroups=
.com" target=3D"_blank">TSCM-..._at_googlegroups.com</a>
=C2=A0 =C2=A0 <a href=3D"mailto:TSCM-..._at_googlegroups.com" target=3D"_blank=
"><mailto:TSCM-..._at_googlegroups.com></a>, to contact the list owner
=C2=A0 =C2=A0 and moderator please send an E-Mail message to <a href=3D"mai=
lto:j..._at_tscm.com" target=3D"_blank">j..._at_tscm.com</a>
=C2=A0 =C2=A0 <a href=3D"mailto:j..._at_tscm.com" target=3D"_blank"><mailto=
:j..._at_tscm.com></a>.
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>=C2=A0 =C2=A0 This group is sponsored by Granite Island Group
=C2=A0 =C2=A0<a href=3D"
http://www.tscm.com/to" target=3D"_blank">
http://ww=
w.tscm.com/to</a> improve the profession of hunting spies,
=C2=A0 =C2=A0 and to educate others in the craft of technical
=C2=A0 =C2=A0 counter-intelligence. Granite Island Group performs bug sweep=
s
=C2=A0 =C2=A0 like it's a full contact sport; we take no prisoners, we =
don't
=C2=A0 =C2=A0 play fair, and we give no quarter. Our professional goal is t=
o
=C2=A0 =C2=A0 simply, and completely stop the spy.
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>=C2=A0 =C2=A0 Granite Island Group Offers World Class, Professio=
nal, Ethical,
=C2=A0 =C2=A0 and Competent Bug Sweeps, and Wiretap Detection using
=C2=A0 =C2=A0 Sophisticated Laboratory Grade Test Equipment.
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>--
You received this message because you are subscribed to the Granite
Island Group "TSCM-L Professionals List" group which is the oldes=
t,
and the largest TSCM group on Earth. To post to this group, send
E-Mail to <a href=3D"mailto:TSCM-..._at_googlegroups.com" target=3D"_blank">TS=
CM-..._at_googlegroups.com</a>, to contact the list owner and
moderator please send an E-Mail message to <a href=3D"mailto:j..._at_tscm.com"=
target=3D"_blank">j..._at_tscm.com</a>.
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>This group is sponsored by Granite Island Grouphttp://<a href=3D=
"
http://www.tscm.com/" target=3D"_blank">www.tscm.com/</a>
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.
</pre>
</blockquote>
<blockquote type=3D"cite">
<pre>Granite Island Group Offers World Class, Professional, Ethical, =
and
Competent Bug Sweeps, and Wiretap Detection using Sophisticated
Laboratory Grade Test Equipment.
</pre>
</blockquote>
<pre>--
James M. Atkinson
President and Sr. Engineer
Granite Island Group
<a href=3D"mailto:jm..._at_tscm.com
http://www.tscm.com/" target=3D"_blank">jm.=
.._at_tscm.com
http://www.tscm.com/</a>- Hide quoted text -
- Show quoted text -
</pre>
</blockquote>
<pre> </pre>
</blockquote>
<br>
<pre cols=3D"80">--=20
James M. Atkinson
President and Sr. Engineer
Granite Island Group
<a href=3D"mailto:jm..._at_tscm.com" target=3D"_blank">jm..._at_tscm.com</a>
<a href=3D"
http://www.tscm.com/" target=3D"_blank">
http://www.tscm.com/</a>
</pre>
</div>
</blockquote></div><br></div></div>
--0016364ec9bcbc0a4b0493603744--
Received on Sat Mar 02 2024 - 00:57:24 CST