[time-nuts] From GPS World - Lightsquared has been given thegoahead

[Bob Camp]

Hi

I would by no means argue with any of those points. The only thing I would
add is that 40,000 transmitters is a *lot* of hardware to fill in gaps. You
could do a pretty good job covering the whole country with that much
hardware. The same math that goes for jamming, also works pretty well for
coverage.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Robert Atkinson
Sent: Thursday, February 03, 2011 12:54 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] From GPS World - Lightsquared has been given
thegoahead



Hi,
First I'm in the UK so this does not directly affect me. I do have some
slightly independent comments.
Firstly the Garmin tests seemed very reasonable and erred to favor
LightSquared. They were free field in an anecohic chamber. There was an L1
notch filter in the output of the LightSquared simulator. I'd guess the
Aviation GPS was worse because of A and older design and B It will only give
valid outputs if it is sure the signal is OK. 
On the politcal side, LightSquared are supposed to be supplying nationwide
satellite service. The ground stations are "fill in" for heavy use areas.
This is seamless with the sat service so they "had" to be the same band. So
they got permission to use the band. What is the betting that once the
service is established they will drop or price hike the sat service? That
would save them the $115,000,000 per year that they are paying Intelsat.
 
Robert G8RPI. 


      
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