Re: [TSCM-L] {1705} GPS Receiver detecting

From: Thomas Shaddack <tsc..._at_shaddack.mauriceward.com>
Date: Mon, 11 Jun 2007 03:29:55 +0200 (CEST)

The GPS receivers use an intermediate frequency at 4.092 MHz. This, and
its harmonics, are likely to be found in the GPS receiver's parasitic
emissions.

16.368, and/or 16.3676 or 16.367667 are crystal oscillators frequently
found in GPS receiver units.

The modulation frequency for the carrier wave is 1.023 MHz.

A narrow-band high sensitivity receiver may be a help here. There are some
frequencies inherent for the system, and unless the receiver is
specifically designed for low emissions at these, it is likely to radiate
predictably.

Is this helpful?



On Sun, 10 Jun 2007, Paolo Sfriso wrote:

>
> Dear Collegues.
>
> Would you know if there are any dedicated GPS receiver detectors (secondary radiation detector ?) that could be used for sweeping an automobile (where the use of a NLJD would be unrealistic due to the presence of a large number of legitimate electronic circuits) and stripping the vehicle to the bone is not an option ?
>
> Of course, the instrument would have to be tested and trustworthy, not some spystore gizmo...
>
> Kind Regards.
>
> Paolo Sfriso CFE
> Director
> GRUPPO S.I.T.
> Security, Investigations & Technology
> Quarto d'Altino, Venice
> ITALY
>
> Phone +39 0422 828517
> Fax +39 0422 823224
> 24hr GSM Cell +39 335 5257308
> www.grupposit.com
> pauls..._at_tin.it
> in..._at_grupposit.com
>
>
> >
>
Received on Sat Mar 02 2024 - 00:57:22 CST