Chuck Harris <[email protected]> wrote: > >What makes you think it needs to be CW, and cannot be pulsed and >chirped? > >All it has to do is confuse the receiver enough so that you can't >trust its readings. > >-Chuck
I said nothing about the type of modulation. The equipment I listed is designed specifically to disrupt GPS. Presumably they use whatever modulation method that gives the best results. However, GPS is spread-spectrum, so it inherently rejects noise that is not correlated with the satellite signal. This means effective jamming requires a lot more power than is available from a 9V transistor radio battery, and even then, the range is only a few meters. I made an error in calculating the average range per watt. The original shows 8.75 meters/watt twice: (33.33 + 8.75 + 8.75 + 12 + 10 + 6.15) / 6 = 13.16 meters/watt. It should be (33.33 + 8.75 + 12 + 10 + 6.15) / 5 = 14.046 meters/watt. This does not affect the conclusion, which is it takes a lot more power to disrupt GPS than it first appears. Putting jammers in Christmas toys would accomplish little except to drain the batteries faster. Mike Monett _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
