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, wa1...@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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: Saturday, July 28, 2012 2:27 AM To: time-nuts@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, wa1...@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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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-boun...@febo.com [mailto:time-nuts-boun...@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-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: Saturday, July 28, 2012 2:27 AM To: time-nuts@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, wa1...@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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
We have about 25 different GPSDOs running from four cheap antennae on the roof in Los Gatos right next to Hwy 17, and have not noted any unusual outages at all, even during the recent solar flare. I guess any truckers with jammers on hwy 17 pass by so fast we don't notice anything. Bye, Said Sent from my iPad On Jul 27, 2012, at 22:18, Brian, WA1ZMS wa1...@att.net wrote: Jim- That's one thing I was afraid of, but did not yet mention to our mgmt. team. But if Light squared lost their Part 5 license, then I can take them off the list. It's a complicated problem that due to the nature of it, I cannot discuss on the reflector. But I'm involved via remote reporting from techs out in the field and their daily reports and conference calls. So I just need to due engineering diligence as I try and help them. I expect my butt will be on a plane next week unless I can identify a 3rd party vendor equipment problem. THANKS! -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Jim Lux Sent: Saturday, July 28, 2012 12:35 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Lightsquared questionfor SFO area On 7/27/12 6:42 PM, Brian, WA1ZMS wrote: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? Very unlikely.. they've lost their experimental license. I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. there are myriad sources of interference out there. Jammers are a BIG problem in urban areas (truckers and cab drivers use them to defeat their GPS based tracking systems and time clocks). there's a great set of articles over the past few months in GPS World about it. -Brian, WA1ZMS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
Brian, I have four GPSDO systems running and logging on a hill West of Redwood City with a view of the South Bay. Let me know if I can help. Craig McCartney 160 Montalvo Road Palomar Park, CA 94062 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Friday, July 27, 2012 6:43 PM To: Time-Nuts Subject: [time-nuts] Lightsquared questionfor SFO area 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 -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
On 7/28/12 1:32 AM, Said Jackson wrote: We have about 25 different GPSDOs running from four cheap antennae on the roof in Los Gatos right next to Hwy 17, and have not noted any unusual outages at all, even during the recent solar flare. I guess any truckers with jammers on hwy 17 pass by so fast we don't notice anything. I think the notable problems at Newark airport were because the jammer containing vehicles were sitting around in one place. http://www.gpsworld.com/government/personal-privacy-jammers-12837 is one among many articles about it. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
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 n6idl...@comcast.net Sender: time-nuts-boun...@febo.com Date: Sat, 28 Jul 2012 00:32:46 To: wa1...@att.net; 'Discussion of precise time and frequency measurement'time-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@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-boun...@febo.com [mailto:time-nuts-boun...@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-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: Saturday, July 28, 2012 2:27 AM To: time-nuts@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, wa1...@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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Lightsquared questionfor SFO area....
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 -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
On Fri, Jul 27, 2012 at 09:42:49PM -0400, Brian, WA1ZMS wrote: 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. Do you have a good SA available and some broadband antennas... And perhaps some logging program like John Mile's SSM ? -- Dave Emery N1PRE/AE, d...@dieconsulting.com DIE Consulting, Weston, Mass 02493 An empty zombie mind with a forlorn barely readable weatherbeaten 'For Rent' sign still vainly flapping outside on the weed encrusted pole - in celebration of what could have been, but wasn't and is not to be now either. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
On 7/27/12 6:42 PM, Brian, WA1ZMS wrote: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? Very unlikely.. they've lost their experimental license. I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. there are myriad sources of interference out there. Jammers are a BIG problem in urban areas (truckers and cab drivers use them to defeat their GPS based tracking systems and time clocks). there's a great set of articles over the past few months in GPS World about it. -Brian, WA1ZMS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
Interesting that they use jammers. The guys on the ambulances just wrap the antennas with the foil from burger wrappers or the like. On Jul 28, 2012, at 0:34, Jim Lux jim...@earthlink.net wrote: On 7/27/12 6:42 PM, Brian, WA1ZMS wrote: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? Very unlikely.. they've lost their experimental license. I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. there are myriad sources of interference out there. Jammers are a BIG problem in urban areas (truckers and cab drivers use them to defeat their GPS based tracking systems and time clocks). there's a great set of articles over the past few months in GPS World about it. -Brian, WA1ZMS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
I've had a graph logging on my HP3816A in San Jose. I see one big glitch on 7/27 ~17:00 UTC. I don't know if it unlocked, nor if it was from something received, or some jump in my hardware. Other than that one jump, I don't see anything unusual over the last week or so. There must be others around here who also have been logging GPSDO's. On 7/27/2012 6:42 PM, Brian, WA1ZMS wrote: 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 -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lightsquared questionfor SFO area....
Jim- That's one thing I was afraid of, but did not yet mention to our mgmt. team. But if Light squared lost their Part 5 license, then I can take them off the list. It's a complicated problem that due to the nature of it, I cannot discuss on the reflector. But I'm involved via remote reporting from techs out in the field and their daily reports and conference calls. So I just need to due engineering diligence as I try and help them. I expect my butt will be on a plane next week unless I can identify a 3rd party vendor equipment problem. THANKS! -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Jim Lux Sent: Saturday, July 28, 2012 12:35 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Lightsquared questionfor SFO area On 7/27/12 6:42 PM, Brian, WA1ZMS wrote: Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? Very unlikely.. they've lost their experimental license. I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. there are myriad sources of interference out there. Jammers are a BIG problem in urban areas (truckers and cab drivers use them to defeat their GPS based tracking systems and time clocks). there's a great set of articles over the past few months in GPS World about it. -Brian, WA1ZMS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
