[time-nuts] GPS Jammer

Frederick Bray fwbray at mminternet.com
Wed Oct 3 11:35:14 EDT 2012


Some 20 to 25 years ago a law enforcement agency in California was experimenting with GPS in its patrol cars. It required that the officer press key to report his/her location. It also had a pinging capability that the officers didn't know about. Through pinging, it was discovered that a number of the officers an interesting habit. Towards the end of their shift,  their cars would be found stationary off the street in industrial areas. While they were close enough to their assigned patrol routes to quickly respond to calls, they avoided coming upon situations they would have to handle that might involve a lot of paperwork or otherwise might hold them past the end of shift. They also used the time to finish accumulated paperwork.


I imagine that they would have liked a GPS jammer after they figured out that they were being watched.

FWBRAY

Sent from my CP/M machine.

On Oct 2, 2012, at 21:40, "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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