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From: "TSCM/SO Group" <Mit..._at_tscmusa.com>
To: <TSCM-..._at_googlegroups.com>
References: <7.0.1.0.2.20080424112322.15bdffa0_at_tscm.com> <009b01c8a653$57d1e910$04c9660a_at_abeporta>
Subject: RE: [TSCM-L] {2610} Re: RF Hawk - Neat Toy
Date: Tue, 29 Apr 2008 11:45:47 -0500
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how much is the hawk?
Mitch Davis
TSCM/Special Operations Group
20 Music Square West,Suite 208
Nashville,TN 37203 USA
615 251 0441
Fax 615 523 0300
mit..._at_tscmusa.com
www.tscmusa.com
"maintaining a higher degree of excellence"
******************************
Tools for investigators at www.covertworx.com
-----Original Message-----
From: TSCM-..._at_googlegroups.com [mailto:TSCM-..._at_googlegroups.com] On
Behalf Of biotecbol
Sent: Thursday, April 24, 2008 4:37 PM
To: TSCM-..._at_googlegroups.com
Subject: [TSCM-L] {2610} Re: RF Hawk - Neat Toy
Excellent explenation and suggestion James
One question, in the case of the amplifiers and filters we need to add
externally devices for to help to the H600 and try to avoid the floor noise?
Thanks,
Abraham
cel: +591-72015165
----- Original Message -----
From: "James M. Atkinson" <jm..._at_tscm.com>
To: <TSCM-..._at_googlegroups.com>
Sent: Thursday, April 24, 2008 12:38 PM
Subject: [TSCM-L] {2595} RF Hawk - Neat Toy
>
> Essentially what we have here is a microwave down convertor, and a
> software defined radio built into a hand-held computer with a touch
> screen.
>
> The noise floor is quite high, and unless you run with a pre-amp on
> all the time you are not going to see many bugs. Intermodulation
> distortion and harmonic bleed through is also a significant problem
> (where is the YIG fiter?).
>
> My suggestion is that if you lay down the money for one that you plan
> on spending an equal amount of money on some quality antenna's, and
> an equal amount on very narrow filters (for the antennas), low noise
> amplifiers tuned to specific bands, and the apparatus you need to
> support the antennas.
>
> Remember that in our business we want to bring the -174 dBm noise
> floor up to the DANL of the instrument we are using (with the
> internal Pre-amp turned off). With this unit you are going to need a
> 53 dB external LNA with less then 1 dB of noise, AND your going to
> need bandpass filters to isolate each band, and band reject filters
> to knock down hot signals once you have checked them.
>
> On the issue of bandpass, band reject filters... I keep one of each
> for every TV station in the area I am performing sweeps in, one for
> the FM band, the ISM and cell bands, and the paging bands to help me
> isolate each station, measure it, and then knock it down so that it
> down not jam up the rest of my measurements.
>
> Do not run the RF HAWK in a fully automatic mode, but rather use them
> to clear small sections of the spectrum, and set on up by itself to
> inventory the spectrum while you do the sweep using other "heavy
> iron". You can also set up a known hostile flags (ie: 398.6, 155.2,
> 168.505, 303, 311, 318, 2411 MHz, etc) so that you get an alarm if
> something pops up that you know is a bad thing.
>
> What you also need to watch out for is that these things are fine for
> looking at 20-30 MHz at a time, but that is all they are good for,
> because as you start moving outside of this span things start getting
> cumbersome with the operating system. If you wan to watch for a burst
> transmitter coming up for a few mS, or tracking down raw interference
> then this will work for you, but it is not going to be of much help
> if you looking for low powered covert devices in a dense RF
> environment (unless you add a lot of filters, amps, and antennas).
> The shifting the down convertors to the next 20-30 MHz band is what
> kills you from a performance perspective. It is also not going to bee
> very helpful in finding bugging devices that use over 50-100 MHz of
> bandwidth, or extremely wide spread spectrum signals.
>
> The most curious aspect of this product (from a hardware perspective)
> is that it has all the hardware to demodulate virtually any
> modulation scheme known to man, and there are provisions for either
> direct or indrect correlation capability so that you could
> theoretically (wink-wink) plug a microphone or strobe light to the
> thing and use it to automatically detect video cameras or audio
> devices. I know that the U.S. Government is buying (or preparing to
> buy) tons of these things for field deployment, so we can expect to
> see them floating into use in the field.
>
> Note: Tek seeded production units to several TSCM companies and
> agencies in November of last year, and most of us had access to a
> beta prototype unit prior to that.
>
> If you want to start exploring this area of TSCM I strongly suggest
> that you start by working with a Ettus Research GNU Radio or and
> SDR-14 until you fully understand Software Defined radio as they
> apply to TSCM BEFORE you start laying down major coin for an RF HAWK,
> then you will have a better understanding of what you are purchasing, and
> why.
>
> -jma
>
>
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> Gloucester, MA 01931-8008 E-mail: mailto:jm..._at_tscm.com
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> spy.
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Received on Sat Mar 02 2024 - 00:57:17 CST