4G and GPS interference

[Frank Whiteley]

http://www.physorg.com/news/2011-02-4g-network-widespread-gps-dead.html

[Jim Logajan]

Frank Whiteley > wrote:
> http://www.physorg.com/news/2011-02-4g-network-widespread-gps-dead.html

Since they used a signal generator to simulate the LightSquared
transmissions, and could therefore insure the signal stayed within the
allocated frequency band, it would appear that the fault is likely in the
GPS receivers.

However, this and other articles seem to claim the LightSquared
transmissions are "interference" - implying that they emit unacceptable
signals outside their allocated frequencies. I'm not sure it would be fair
to characterize their emissions as "interference" if in fact the GPS
receivers are "listening" too sensitively to frequencies outside their
working bands.

In the end I expect LightSquared is going to be forced to change their
operating plans because of the installed base of GPS receivers,
irrespective of the quality (or lack thereof) of the GPS receivers or
LightSquared equipment.

[ray conlon]

On Feb 23, 3:47*pm, Frank Whiteley > wrote:
> http://www.physorg.com/news/2011-02-4g-network-widespread-gps-dead.html

Add this to solar flares,problems with CATV amplifiers,UHF trnasmitter
harmonics, etc. etc., and you beging to understand why VOR,ILS and
ground based radar and transponders will be around for a long
time...not to mention the FAA underestimated the cost of the GPS
equipment/system by a factor of about 10X original projected cost.

[Martin Gregorie[_5_]]

On Wed, 23 Feb 2011 12:47:49 -0800, Frank Whiteley wrote:

> http://www.physorg.com/news/2011-02-4g-network-widespread-gps-dead.html

Here's a link to the original test report:

http://www.gpsworld.com/gnss-system/signal-processing/lightsquared-
jamming-report-11030


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

[Kolie]

The way money affects politics is a lot easier to predict than the
effect of adjacent radio frequencies on each other:

http://www.washingtontimes.com/news/2011/feb/7/obama-to-america-get-lost/