I'm very south of the equator on a family vacation right now, away from my lab,
remote enough to miss the upcoming leap second. But here's a photo of a sundial
I made with driftwood and shell markers every 5 minutes.
inline: photo.JPG
/tvb
With four points one can compute ADEV...
inline: photo.JPG
/tvb (iPhone4)___
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Yes, and the reference?
On Tue, Jun 26, 2012 at 2:32 PM, Tom Van Baak (lab) t...@leapsecond.comwrote:
With four points one can compute ADEV...
/tvb (iPhone4)
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Hi Nuts,
I have been building an LF transmitter, and have provision for a 1PPS input
for calibration purposes. However I would like to be able to provide more
time information than just the second pulses. It occurs to me that full time
info could be encoded onto a 1PPS stream by changing the
Yes, already done: the DCF77 VLF time transmitter and others.
On Tue, Jun 26, 2012 at 3:15 PM, Clayton G clay...@isnotcrazy.com wrote:
Hi Nuts,
I have been building an LF transmitter, and have provision for a 1PPS
input for calibration purposes. However I would like to be able to provide
See below, after /tvb ;)
El 26/06/2012 15:08, Azelio Boriani escribió:
Yes, and the reference?
On Tue, Jun 26, 2012 at 2:32 PM, Tom Van Baak (lab) t...@leapsecond.comwrote:
With four points one can compute ADEV...
/tvb (iPhone4)
___
time-nuts
On 6/26/2012 9:15 AM, Clayton G wrote:
Hi Nuts,
I have been building an LF transmitter, and have provision for a 1PPS
input for calibration purposes. However I would like to be able to
provide more time information than just the second pulses. It occurs
to me that full time info could be
Hi Clayton:
Check out WWVB.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Clayton G wrote:
Hi Nuts,
I have been building an LF transmitter, and have provision for a 1PPS input for calibration purposes. However I would
like to be able to
OK, in my opinion the iPhone is not a reference but, well, if you say it is
then OK.
On Tue, Jun 26, 2012 at 3:20 PM, Javier Herrero jherr...@hvsistemas.eswrote:
See below, after /tvb ;)
El 26/06/2012 15:08, Azelio Boriani escribió:
Yes, and the reference?
On Tue, Jun 26, 2012 at 2:32 PM,
You can download an app from emerald sequoia that will tell you how accurate
your iPhone clock is (: You can even use your own ntp server if you wish.
My iPod is currently .575 seconds slow (:
Sent from my iPod
On 2012-06-26, at 9:32 AM, Azelio Boriani azelio.bori...@screen.it wrote:
It can be a reference. I was not meaning a good one :) And surely it is
not that bad as a clock.
El 26/06/2012 15:32, Azelio Boriani escribió:
OK, in my opinion the iPhone is not a reference but, well, if you say it is
then OK.
On Tue, Jun 26, 2012 at 3:20 PM, Javier Herrero
Until we arrogant humans decided that we could do better, it WAS the clock.
Tom Holmes, N8ZM
Tipp City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Javier Herrero
Sent: Tuesday, June 26, 2012 10:17 AM
To:
...and still good enough for a lot of folks!
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Holmes
Sent: 26 June 2012 15:24
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Clockwise.
Until
Hi
I suspect that encoding 10 bits via AM PWM is likely to be a bit exciting
from a signal to noise standpoint on the receiving end. Back in the good old
days a 1/3 2/3 width switch was a normal way to encode a single bit.
Bob
-Original Message-
From: time-nuts-boun...@febo.com
Am 26.06.2012 18:12, schrieb Bob Camp:
fo could be encoded onto a 1PPS stream by changing the width of the pulse
itself. The rising edge can be left unchanged to indicate the precise
second, but the trailing edge can vary between (say) 100mSec and 300mSec,
and this could encode 60 bits (with
On Tue, Jun 26, 2012 at 6:15 AM, Clayton G clay...@isnotcrazy.com wrote:
Hi Nuts,
I have been building an LF transmitter, and have provision for a 1PPS
input for calibration purposes. However I would like to be able to provide
more time information than just the second pulses. It occurs to
Around 1530, it was considered very bad luck to walk around a church
widdershins (see the Wikipedia article). I think it goes back earlier
than that, to a time well before clocks.
If widdershins means counter-clockwise, how did they know which way
clocks ran?
The answer lies in northern
t...@leapsecond.com said:
I'm very south of the equator on a family vacation right now, away from my
lab, remote enough to miss the upcoming leap second. But here's a photo of
a sundial I made with driftwood and shell markers every 5 minutes.
Speaking of sundials, here is a neat one:
It's also connected to handedness. widdershins means to go leftwise,
deasil righthanded or rightwise. lefthandedness bad, righthandedness
good.
Threads righthanded usually, bunches of other stuff.
Don
Bill Hawkins
Around 1530, it was considered very bad luck to walk around a church
widdershins
Direct GPS signals, RHCP, good! Reflections (multipath) LHCP bad! ;-)
--
Björn
It's also connected to handedness. widdershins means to go leftwise,
deasil righthanded or rightwise. lefthandedness bad, righthandedness
good.
Threads righthanded usually, bunches of other stuff.
Don
Hi
Since most of this is Euro-centric:
Hops (and possibly other plants) cycle in a clockwise direction as they grow
in the northern hemisphere. They grow fast enough early in the season that
completing one (or more) revolutions per day is pretty normal.
Bob
-Original Message-
From:
Two part question:
I'd like to test the effect of small signal level changes on the phase output
of a high resolution linear phase detector at ADEV values below 1e-16 and tau
1000 sec.
I'm looking for suggestions on how I can manually vary the signal amplitude of
one of it's 10 MHz sine wave
Sub 0.1pS range for which time extension? Only during the amplitude change?
On Tue, Jun 26, 2012 at 8:58 PM, WarrenS warrensjmail-...@yahoo.com wrote:
Two part question:
I'd like to test the effect of small signal level changes on the phase
output of a high resolution linear phase detector
Bill Hawkins schrieb:
Around 1530, it was considered very bad luck to walk around a church
widdershins (see the Wikipedia article). I think it goes back earlier
than that, to a time well before clocks.
They wrote at Wiki:
Because the sun played a highly important role in primitive religion,
Also, most useful isomers are rh, eg dextrose and levulose. also, if you
are facile with your hands, you're dexterous. c c...
The universe is right handed...
Don
Bob Camp
Hi
Since most of this is Euro-centric:
Hops (and possibly other plants) cycle in a clockwise direction as they
grow
in
On 6/25/12 7:11 PM, Chris Albertson wrote:
On Mon, Jun 25, 2012 at 6:43 PM,li...@lazygranch.com wrote:
Yeah, I read it. Typical Fox. The headline isn't accurate since they
spoofed the civilian GPS system, not the military GPS.
I think it is. Currently the military uses GPS guided drones
Whether it's spoofing or jamming, domestic drones are becoming ubiquitous,
because they are just so tempting, and sooner or later one is gonna crash
onto a populated area, either by accident or deliberate mischief.
A piloted aircraft may be able to avoid hitting a school; a drone may not.
-John
On 6/26/12 3:38 PM, J. Forster wrote:
Whether it's spoofing or jamming, domestic drones are becoming ubiquitous,
because they are just so tempting, and sooner or later one is gonna crash
onto a populated area, either by accident or deliberate mischief.
A piloted aircraft may be able to avoid
On 6/26/12 11:05 AM, Bill Hawkins wrote:
Around 1530, it was considered very bad luck to walk around a church
widdershins (see the Wikipedia article). I think it goes back earlier
than that, to a time well before clocks.
If widdershins means counter-clockwise, how did they know which way
clocks
IMO, your failure rate estimate does not include the probability that some
people might not like being spied on by UAVs.
I can easily see a market for ground based GPS jammers, especially, in the
more rugged, fertile, and inaccessible areas of California.
YMMV,
-John
=
On
If the GPS is jammed, the UAV goes into a failsafe mode. That can mean a lot of
things, but often just orbit. I FOIAd a crash near Creech that sounded
according to newspaper account as to crashing in free territory. It failsafed
into the side of a mountain located on restricted territory.
The
On 6/26/2012 7:57 PM, li...@lazygranch.com wrote:
If the GPS is jammed, the UAV goes into a failsafe mode.
If the GPS _knows_ it has been jammed, the UAV goes into a failsafe mode.
There, fixed that for you.
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time-nuts mailing list --
Jim Lux schrieb:
widdershins derives from Middle low german weddersines from Middle High
German widersinnes, wider=back + sinnes=in the direction of
widersinnig means 'nonsense' = not useful in the common thinking.
The german wider- means 'against something'. There is another german
word
On Tue, Jun 26, 2012 at 3:59 PM, Jim Lux jim...@earthlink.net wrote:
I did some calculations last year, and if Los Angeles decided to put up a
UAV 24/7 to replace things like helicopters, we could expect a crash into
the city about once a week.
But they could be made very safe for only a
I have been around military jamming. The GPS goes to zilch. It isn't a soft
degradation.
-Original Message-
From: Mike S mi...@flatsurface.com
Sender: time-nuts-boun...@febo.com
Date: Tue, 26 Jun 2012 20:15:03
To: time-nuts@febo.com
Reply-To: Discussion of precise time and frequency
Report title:
Safety Considerations for Operation of Unmanned Aerial Vehicles in the
National Airspace System
Weibel, Roland E; Hansman, R. John
Link is here:
http://dspace.mit.edu/handle/1721.1/34912
2005 so a bit behind current state of art but what municipalities are going
to pony up for
On 6/26/2012 9:53 PM, li...@lazygranch.com wrote:
I have been around military jamming. The GPS goes to zilch. It isn't
a soft degradation.
Whoosh. The (off-topic) discussion is about civilian GPS, as used by
civilian drones. I take it you didn't read the linked article from the
OP, which
On 6/26/12 4:42 PM, J. Forster wrote:
IMO, your failure rate estimate does not include the probability that some
people might not like being spied on by UAVs.
I can easily see a market for ground based GPS jammers, especially, in the
more rugged, fertile, and inaccessible areas of California.
On 6/26/12 5:51 PM, Chris Albertson wrote:
On Tue, Jun 26, 2012 at 3:59 PM, Jim Luxjim...@earthlink.net wrote:
I did some calculations last year, and if Los Angeles decided to put up a
UAV 24/7 to replace things like helicopters, we could expect a crash into
the city about once a week.
The smaller path loss from the ground to a UAV v. UAV to satellite easily
trumps the front/back ratio of most all antennas.
-John
=
On 6/26/12 4:42 PM, J. Forster wrote:
IMO, your failure rate estimate does not include the probability that
some
people might not like being
Mount a GPS antenna on the bottom of the UAV. If you get strong signals
from that antenna, assume information assurance has failed.
There are countermeasures, and of course counter-counter-measures.
Here is a photo of a predator spying on me:
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