On Fri, Jul 27, 2012 at 09:42:49PM -0400, Brian, WA1ZMS wrote:

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, die@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."

On 7/27/12 6:42 PM, Brian, WA1ZMS wrote:

Very unlikely.. they've lost their experimental license.

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.

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 jimlux@earthlink.net wrote:

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:

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-bounces@febo.com [mailto:time-nuts-bounces@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:

Very unlikely.. they've lost their experimental license.

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.

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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" wa1zms@att.net wrote:

On 7/28/12 1:32 AM, Said Jackson wrote:

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.