[time-nuts] GPS Jammer

bownes bownes at gmail.com
Wed Oct 3 00:46:27 EDT 2012


Many folks.

The paranoid tinfoil hat crowd

Folks who are concerned that law enforcement has placed a GPS tracker on their car. 

Truckers avoiding log enforcement

Truckers who want to sleep rather than drive. 

Ambulance drivers who want to sleep but claim to have been held up at hospital. 

Emergency services personnel (fire,ems,law enforcement) who want to take the company vehicle where they are not supposed to.


Just a few of the many I can think of!

On Oct 3, 2012, at 0:40, "Ron Ward" <n6idlron at comcast.net> wrote:

> Hi:
> Other than a terrorist, who would want to jam GPS?
> Ron
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Magnus Danielson
> Sent: Tuesday, October 02, 2012 2:28 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] GPS Jammer
> 
> On 10/02/2012 11:05 PM, John Lofgren wrote:
>> The 0.5 W and + 10 dBm numbers in the specs don't work out.  +10 dBm is 10
> mW.  I suspect that the 1/2 watt is really the DC input power.
> 
> Now, that makes sense.
> 
>> And, I'd agree about the range.  +10 dBm into a dipole at 10 meters gets
> you about -44 dBm at the receiver antenna in a free-space model.  That's
> really loud compared to the nominal -130 to -140 dBm you'd hear from the
> satellites.
> 
> Indeed. Even for 10 mW it was not reasonable. No wonders that "1-10 m 
> jammers" cause such grief to DHS. Serious overkill.
> 
> Cheers,
> Magnus
> 
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