[time-nuts] GPS interference and history...

Jim Lux jimlux at earthlink.net
Thu Jun 9 19:32:42 UTC 2011

On 6/9/11 12:22 PM, Chuck Forsberg WA7KGX N2469R wrote:
> According to the John Deere article, the higher performance GPS
> receivers, such as those used
> for agricultural application and IFR navigation have wider front ends to
> obtain more precise information
> from GPS signals. The LightSquared transmitters wouldn't pose such a
> problem if they were in orbit.

Exactly.. Deere (and others) designed based on the general understanding 
of what the spectrum would look like.  Mostly satellite radiated (where, 
as others have noted, you're limited to a few kW) and a few "fill-in" 
transmitters to handle "urban canyons" and the like.. low power in 
general, and not in the middle of a farm field in any case.

The L^2 scheme turned that on its head.. lots of high powered 
terrestrial transmitters, etc.

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