[time-nuts] GPS interference and history...
Burt I. Weiner
biwa at att.net
Thu Jun 9 17:29:14 UTC 2011
For many years the FCC has not allowed FM broadcast stations within
certain distances of each other where a 10.7 MHz frequency difference
existed. Not exactly the same thing, but did show an understanding
of what can go wrong as a result of good receiver front end
selectivity. In AM and FM broadcasting there has also been required
distances between 1st and 2nd adjacent channels, only partially
because of overload issues but more so because of occupied bandwidth
and overlapping. I'm not sure how much more it would cost to build
GPS receivers with better front ends, but I'm sure it would've priced
GPS devices out of the hands of many consumer level users. The FCC
under the direction of Congress has made (allowed) some pretty stupid
moves in the past bunch of years. In my opinion, the FCC has
forgotten what their purpose is, and being run by attorneys has made
the situation that much worse as there are very few attorneys that
understand the un-revocable physics of the electromagnetic spectrum.
At 10:07 AM 6/9/2011, time-nuts-request at febo.com wrote
>On the other hand, what can be said about the wisdom of engineers that
>designed a product that cannot withstand any interference from adjoining
>spectrum holders? It has been known for at least the last 6 years that
>LightSquared's predecessor was going to occupy that spectrum with a land
>Does the GPS world really have much to say about the interference if
>LightSquared keeps their transmitters clean and out of the GPS spectrum?
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
biwa at att.net
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