Not a time-nut issue but most banks that batch process will process the
debits before the credit so that they get to charge you no matter what.
They probably don't all do it but some definitely do. I had one bank even
charge me multiple overdraft fees because they processed the largest checks
My company paid for my shield room the real trick was getting the door in which
weighed 600-800 pounds.
As to the old generator I restore old machinery as another hobby for the times
I want to disengage brain. But photoetched brass id plates show so much more
thought than thermal printed
We sound like we could be cousins, Scott. When we bought our current house,
I discovered that the previous owner had built a Faraday cage in a small
room off the basement. I put all my stuff in there. I also have a generator
with magneto ignition so I should be good to go when the end-of-the-world
Actually
I do have much of my equipment inside a shield room, not for tinfoil hat
reasons but to keep experimental systems from causing interference and to
eliminate existing RF sources in the 800 Mhz to 8 Ghz range as error sources in
measurements.
If one is concerned there are lots of old
Gentlemen, I've found this discussion interesting and informative. This
household works on quantum information theory rather than engineering so
there is much for us to learn.
I must observe that if an event takes out the entire GPS system (which a
Carrington event would not do) we will have
On Fri, Sep 7, 2018 at 8:32 PM Bob kb8tq wrote:
> This is Time Nuts, not end of the world nuts …..
> ...
> I think we’ve all heard plenty of “the world is ending” stuff.
>
But the availability of a T service under adverse conditions and the
ability of a system which consumes a T reference to
Hi
> On Sep 8, 2018, at 1:53 PM, Scott McGrath wrote:
>
> This is precisely the scenario even a short GPS blackout of 1-2 weeks would
> cause. Its not that GPS is not the finest time transfer system ever
> devised. Its that with the loss of legacy systems we’ve lost the ability to
>
This is precisely the scenario even a short GPS blackout of 1-2 weeks would
cause. Its not that GPS is not the finest time transfer system ever devised.
Its that with the loss of legacy systems we’ve lost the ability to degrade
gracefully.
With a eLORAN system cell networks during a
On Tue, Sep 4, 2018 at 3:23 PM Graham / KE9H wrote:
>
> The following are active GPS NOTAMs.
Didn't know NOTAMs went out for GPS interruptions but of course they
do. Surprised, actually, that there are so many. And yet, life goes
on. Must be all those WWV backups.
Hi
I believe the 50 ns is the “as transmitted” signal from the tower. The “as
received” signal after going
through all the various gyrations is not that good on a ~1 second basis.
One of the gotchas here is that we lump “systems” into one giant bag. That’s
not a good way
to analyze
On 9/7/18 10:05 PM, John Reid wrote:
Hi all,
discussion of how to keep accurate time without access to GPS seems very
on topic to me.
These people involved in major catastrophe ('end of the world' as you
put it) scenarios have a wealth of experience in other ways of keeping
accurate time.
kb...@n1k.org said:
> You are not trying to run a cell system when checking your local oscillator
> against LORAN.
The eLoran committee said 50 ns. Is that good enough for cell towers?
Too bad it isn't up so we could collect some data.
--
These are my opinions. I hate spam.
Here is an interesting and fairly recent link regarding eloran and
telecom.
https://rntfnd.org/2017/09/17/telecom-organization-recommends-eloran-system/
The report is here:
https://access.atis.org/apps/group_public/download.php/36304/ATIS-095.pdf
Page 11 has an nice table called "Time and
:35, time-nuts-requ...@lists.febo.com wrote:
>
> Message: 10
> Date: Fri, 7 Sep 2018 20:31:32 -0400
> From: Bob kb8tq
> To: Discussion of precise time and frequency measurement
>
> Subject: Re: [time-nuts] Lost GPS lock or 1PPS recently?
> Message-ID: <75fbe2
Hi
This is Time Nuts, not end of the world nuts …..
I most certainly did *not* design these systems. The *do* have timing
requirements. If those requirements
are not met, they stop working. That’s just the way it goes. Designing these
systems at the timing level was
done a decade ago. You can
You are SO convinced that GPS will ALWAYS be there, I’m NOT (Think Carrington
Event) and i’ve been part of a few disaster exercises where both Internet and
GPS were considered ‘down’ for the exercise and these exercises are done in
conjunction with the military so PPS was also ‘off the
aph...@comcast.net said:
> Here is a powerpoint presentation arguing for e-loran:
> https://www.gps.gov/governance/advisory/meetings/2009-05/doherty.pdf
Thanks.
eLoran meets needs of all identified critical applications -- and others
-- 10-20 meter navigation accuracy for harbor entrance
--
Hi,
This is so not my area of interest but I did come across the
following quote from the link listed below.
"A backup system is also a possible element. The British have
demonstrated that eLoran can deliver time with 50 nanoseconds
accuracy or better “pretty much anywhere you want to,”
As to eLORAN, you can deny positioning but maintain timing service simply by
modifying the GRI and since eLORAN is software based thats not a difficult
change.
Navigation receivers go into fail but timing receivers only need ONE station.
As the users of SRS700’s and Austrons do when
Gee, thats strange especially for those of us who ran the Austron comparitors
to check our local standards against the LORSTA’s
On Sep 6, 2018, at 8:04 PM, Bob kb8tq wrote:
Hi
No, eLoran *never* on it’s best day could ever deliver the kind of timing that
the vast majority
of these systems
Hi
No, eLoran *never* on it’s best day could ever deliver the kind of timing that
the vast majority
of these systems require. It simply is not and can not do the job. The world
has moved *way*
past the sort of timing it can actually deliver.
Bob
> On Sep 6, 2018, at 6:35 PM, Scott McGrath
GPS.gov: Selective Availability
https://www.gps.gov/systems/gps/modernization/sa/
Sep 23, 2016 - The United States has no intent to ever use Selective
Availability again. In September 2007, the U.S. government announced
its decision to procure the future generation of GPS satellites,
known as
I'm sure this has been discussed many times here.
E-Loran - I designed the timing hardware that controlled the
transmitters for that upgrade while I was at Timing Solutions.
As I remember it, it was funded by the FAA to be a backup for GPS.
The FAA planned to make more use of GPS in the
On Thu, Sep 06, 2018 at 06:35:23PM -0400, Scott McGrath wrote:
> Actually we DID have a radio based system that provided sufficient accuracy
> it was called eLORAN but it was killed by US politicians because they did not
> want a much more inexpensive to operate system ???competing??? with GPS.
Actually we DID have a radio based system that provided sufficient accuracy it
was called eLORAN but it was killed by US politicians because they did not want
a much more inexpensive to operate system ‘competing’ with GPS.Shutting
down LORAN saved 32m dollars annually the NAVSTAR GPS
I read that the latest GPS sats don't even have the ability to implement
selective availability... seems a dubious claim to me, though.
-
> Indeed it might get turned back on again.
___
time-nuts mailing list --
Hi
Well, we *do* have experience with that. It was called selective availability.
Indeed it might get turned back on again. It’s impact on a properly designed
GPSDO - not much. It takes a bit longer to get to best stability. System time
wise, it still works “good enough”.
A four hour long
We just put up another GPS antenna for our backup thunderbolt, and now IT is
blaming that for why our wifi is sluggish.
And it happens whether the new antenna is even connected!
https://www.kb6nu.com/theyll-do-it-every-time/
I should have known.. (KC6ETE here)
And there is the other significant vulnerability since GPS is a MILITARY system
the DoD can take it offline for any reason at any time.
Leaving civilian users with nothing,
If its a national security threat its likely the other GNSS systems will be
unavailable as well.
On Sep 6,
On Tue, 4 Sep 2018, 18:35 John Sloan, wrote:
> Folks:
>
>
>
> Yesterday (2018-09-03) afternoon (about 22:00UTC, 16:00MDT) I noticed one
> of my three home-made GPS-disciplined NTP servers had lost its GPS lock.
> After some forensics on my part, this (2018-09-04) morning (about 16:00UTC,
>
Folks:
Well blow me down. It took some Google Maps fu on the web on my part, but
my time and place does indeed coincide with this “GPS Interference Testing” at
White Sands Missile Range. I just happened to be in my home office watching
several of my GPS-disciplined NTP servers when this
I'm in Silicon Valley. I'm logging some data from a Z3801A and a KS-24361.
I have a poor antenna location. I'm used to the Z3801A dropping into holdover
every few days when it can't find any satellites. Less often for the KS-24361.
I noticed some strange activity in the past few days. The
Actually. I have 6... And a large assortment of directional antennas of many
flavors LPDA, Horn etc,I have to get out there and find the interfering
source.
Cable company has been having problems with ‘booster’ amplifiers installed by
homeowners to ‘clean up’ noisy DTV signals. So just
The following are active GPS NOTAMs.
Data Current as of: Tue, 04 Sep 2018 19:16:00 UTC
GPS GLOBAL POSITIONING SYSTEM [Back to Top] !GPS 09/009 (KNMH A0020/18)
GPS NAV PRN 02 OUT OF SERVICE 1809061455-1809070255
ZAB ALBUQUERQUE (ARTCC),NM. [Back to Top] !GPS 08/259 (KZAB A0367/18) ZAB
NAV GPS
Scott & John,
Do either of you have any activity by "Light Squared" (or whatever it's now
called) in your area. Jamming does not always have to be in-band to be
effective.
Dana
On Tue, Sep 4, 2018 at 1:11 PM Scott McGrath wrote:
> My TrueTime DC-XL has lost lock since yesterday as has my
Folks:
GPS jamming and spoofing isn't really my area of expertise, but it's something
I worry about, not just for its impact on geolocation and navigation
applications, but also because GPS has become critical as a high precision
timing reference in the telecommunications realm, which *is* my
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