[time-nuts] Lightsquared questionfor SFO area....

[lists at lazygranch.com]

The filters won't help with intentional on-frequency jamming. I assume the filters are there to reduce the effect of out of band signals on the AGC. (As the hams say, desense.) 

It seems to me a good market for next generation GPSs is spoof and/or RFI detection. 
-----Original Message-----
From: "Ron Ward" <n6idlron at comcast.net>
Sender: time-nuts-bounces at febo.com
Date: Sat, 28 Jul 2012 00:32:46 
To: <wa1zms at att.net>; 'Discussion of precise time and frequency measurement'<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Lightsquared questionfor SFO area....

Hi Brian:
Would you please let me know which antennas they will be using and if
this solves the problem?
Thanks,
Ron

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brian, WA1ZMS
Sent: Friday, July 27, 2012 11:55 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lightsquared questionfor SFO area....

Nigel-

I remember that event.  This issue I'm remotely dealing with now seems
to be
limited to a specific local
area bounded by a few km.   So local QRM is possible.  On Saturday the
techs
will install all new GPS antennas with
integrated band-pass filters.

Conf call on Saturday night at 6pm my time will produce more date.

-Brian, WA1ZMS

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of GandalfG8 at aol.com
Sent: Saturday, July 28, 2012 2:27 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Lightsquared questionfor SFO area....

This is one well documented example of an earlier unintentional jamming
incident.....
 
_http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776_
(http://www.gpsworld.com/gnss-system/signal-processing/the-hunt-rfi-776)

 
Regards
 
Nigel
GM8PZR
 
 
In a message dated 28/07/2012 02:43:23 GMT Daylight Time, wa1zms at att.net
writes:

Does  anyone know if there is ANY recent active Lightsquared testing
taking
place  in the SFO area of the US?

I'm dealing with a day-job issue with GPS  clocks in the Bay Area
showing
"GPS unlocked" errors from 3rd party  equipment.

-Brian,  WA1ZMS



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