[time-nuts] GPS Jammer

Magnus Danielson magnus at rubidium.dyndns.org
Tue Oct 2 17:28:09 EDT 2012


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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