[time-nuts] GPS Jammer

Ron Ward n6idlron at comcast.net
Wed Oct 3 04:40:10 UTC 2012


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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