[El Gato]

4 Watts can jam signals to 200KM?? Hmmmm. I'm no RF electrical engineer, but I seem to recall a broadcast omnidirectional signal loses power proportional to the cube of the distance from the antenna. 4 Watts can jam to 200KM?? FReeper expert help requested.

It's the square of the distance, not the the cube. Remember though that the GPS satellites, whose signal is what is actually being jammed, are much farther away than 200km, so the signal to be overcome is pretty weak, even though it's intial stregth may have been stronger than the jammer.

[Dan(9698)]

The GPS satelites are not 21,000 miles up.

They are low earth orbit, and the antenna is on the back of the bomb, with directional coverage.

The bomb looks up, not down and so the jammer would have to be reletively powerful.

[lepton]

so to equal a 4W transmitter, the satellite would have to be transmitting at 40,000W.