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" <[email protected]> Sender: [email protected] Date: Sat, 28 Jul 2012 00:32:46 To: <[email protected]>; 'Discussion of precise time and frequency measurement'<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> 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: [email protected] [mailto:[email protected]] 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: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Saturday, July 28, 2012 2:27 AM To: [email protected] 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, [email protected] 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
