mag...@rubidium.dyndns.org said:
I did a temporary hack on the PID code to convert the D-term into I^2 term,
by integrating the integrator output. First attempt was indeed quite
resonant just to show that I was in the unsafe region. Backing down on the
strength of the component sure did
Does anybody have data on the drift of Rs or Cs?
Rule of thumb:
...
Ah, thanks. But by Rs and Cs I meant plural or R/resistor and C/capacitor.
I know they change a lot with temperature, but how much do they drift if the
temperature is constant?
--
These are my opinions. I hate spam.
b...@evoria.net said:
Thanks for the response. I've got a UT+ in the parts box. But that's not
the problem I'm trying to solve. I'm trying to make the best GPSDO that I
can make using a nav receiver at the moment. Call it an obsession if you
like. It's OK if I don't have corrections to
albertson.ch...@gmail.com said:
The assumption NTP makes is that you can judge the quality of a server by
the variance (of jitter) in the time it reports.
I think it's more complicated than that.
I think it also includes the non-jitter part of the round trip time. NTP
assumes the path is
ja...@extremeoverclocking.com said:
If there was some sort of feature in NTP (maybe there already is???), or
even a separate program that could test a list of NTP servers to try and
pick the lowest latency, I think that could have a positive benefit on
better time transfer.
The current
On Sun, Mar 23, 2014 at 11:50 PM, Hal Murray hmur...@megapathdsl.netwrote:
albertson.ch...@gmail.com said:
The assumption NTP makes is that you can judge the quality of a server
by
the variance (of jitter) in the time it reports.
I think it's more complicated than that.
I think it
David wrote:
How do you lock your OCXO to the PRS10?
I just use a 1:1 PLL. Some will argue that phase locking two
oscillators running at the same frequency is not optimal, but I have
found that it can work very well. YMMV. Perhaps locking a 100 MHz
OCXO to the PRS10 and dividing its
In message CABbxVHuQc0144==21mDa_R8ErKov=em+9rvrbpggexnzztj...@mail.gmail.com
, Chris Albertson writes:
Yes. NTP calls it root distance [...]
And it is generally useless, because people don't calibrate it.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org |
Thanks Paul,
I should be able to get this information online,
but nearly all my attempts to get information from
USA military sites seem to be blocked to Australia,
or may be just to me.
I click the URL and wait two minutes and it times out.
Any time day or night.
It is very frustrating as the
Hi
Which R’s and C’s did you buy? There are a *lot* of different types and they
each have their issues. A very common issue is - “they came from the store”.
Any ability to trace them back to a manufacturer and a process has been lost.
Bob
On Mar 24, 2014, at 2:29 AM, Hal Murray
Hi
There is a lot of math in a GPS receiver. In a “typical” nav receiver, time is
not a priority. The code may well be optimized to “shove” all the error into
time rather than position. They also may not have spend much effort debugging
the time related code ….
Bob
On Mar 23, 2014, at 11:08
Try the _Astronomical Almanac_. I am not so familiar with the
navigation almanacs, but the bread and butter of the astronomical
almanac is the equation of time and transformation between time
systems. The joint publisher is HMNAO so I'm sure not banned from
Australia :-)
On 3/24/14, Neville
On 3/23/14 10:48 AM, Paul wrote:
On Sun, Mar 23, 2014 at 1:08 PM, Bob Camp li...@rtty.us wrote:
I suspect that what NIST is looking for is somebody in the cloud business
(Amazon, Google, Microsoft, IBM) to step up and mention that they have
2,989,875 server racks scattered about the world and
On Sun, 23 Mar 2014 21:33:07 -0400, time-nuts-requ...@febo.com wrote:
Message: 1
Date: Mon, 24 Mar 2014 00:48:01 +0100
From: Magnus Danielson mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPSDO simulation tool
Jim,
On 23/03/14 16:00, Jim Miller wrote:
To
Neville,
Use an AOL account to access the web.
Has worked for me like a charm for two decades now even in places like China
that like to block most of the good US sites. Basically creates a VPN into the
AOL servers bypassing all the filtering.
Bye,
Said
Sent From iPhone
On Mar 24, 2014, at
That was kind of like my suggestion. You can't back out random noise. But
you can measure noise.
I think not using the data when it is noisy is the extreme case of what I
suggested which was to get the loop gain based on the noise. Not looking
at the data is the same as setting gain to zero.
I think this sort of table is what you want, right? Vernal equinox is when
sun passes through zero point of right ascension.
I made this online at http://aa.usno.navy.mil/data/docs/geocentric.php
Astronomical almanac has coarser tables and constants/instructions for
interpolating.
I think the
Said Jackson saidj...@aol.com wrote:
Use an AOL account to access the web.
Or use Tor. Can you get to Tor entry nodes from Australia?
SF
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There is a UK version of the almanac: http://asa.hmnao.com/
David N1HAC
On 3/24/14 7:26 AM, Tim Shoppa wrote:
Try the _Astronomical Almanac_. I am not so familiar with the
navigation almanacs, but the bread and butter of the astronomical
almanac is the equation of time and transformation
I'm reading the Rev6.x Users guide from the Synergy website.
The timing accuracy quoted on Page 21 indicates 20ns 6sigma average
without the clock granularity message which I interpret to mean the user
is not correcting for sawtooth errors.
The timing granularity message from Page 167 is shown
There is a UK version of the almanac: http://asa.hmnao.com/
David N1HAC
On 3/24/14 7:26 AM, Tim Shoppa wrote:
Try the _Astronomical Almanac_. I am not so familiar with the
navigation almanacs, but the bread and butter of the astronomical
almanac is the equation of time and transformation
Poul-Henning Kamp writes:
In message CABbxVHuQc0144==21mDa_R8ErKov=em+9rvrbpggexnzztj...@mail.gmail.co
m
, Chris Albertson writes:
Yes. NTP calls it root distance [...]
And it is generally useless, because people don't calibrate it.
http://bugs.ntp.org/show_bug.cgi?id=2587
Because I've
Find a copy of Meeus's Astronomical algorithms and program it for when
you want the data.
Ronald
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In message e1wsboi-000dny...@stenn.ntp.org, Harlan Stenn writes:
Poul-Henning Kamp writes:
In message CABbxVHuQc0144==21mDa_R8ErKov=em+9rvrbpggexnzztj...@mail.gmail.co
m
, Chris Albertson writes:
Yes. NTP calls it root distance [...]
And it is generally useless, because people don't
According to a report on FOX, INMARSAT was able to determine the Malasia
Air followed the southern traectory from the Dopplar of the pings. They
verified their model by tracking other planes.
-John
=
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Poul-Henning Kamp writes:
In message e1wsboi-000dny...@stenn.ntp.org, Harlan Stenn writes:
Poul-Henning Kamp writes:
In message
CABbxVHuQc0144==21mDa_R8ErKov=em+9rvrbpggexnzztj...@mail.gmail.com
, Chris Albertson writes:
Yes. NTP calls it root distance [...]
And it is generally
Yes, word is that they were able to determine the Doppler shift in the
plane's signal. I'm surprised this was even recorded but it must have been
in the satellite's telemetry downlink. Projecting radial velocity and
constraining it to be close to the earth's surface, I guess determines one
path
On 3/24/14 6:15 PM, Chris Albertson wrote:
Yes, word is that they were able to determine the Doppler shift in the
plane's signal. I'm surprised this was even recorded but it must have been
in the satellite's telemetry downlink. Projecting radial velocity and
constraining it to be close to the
I found this to be a nice video for the non-Time Nut to try and understand
what why about time..
http://knowmore.washingtonpost.com/2014/03/17/this-man-knows-what-time-it-is
-but-not-what-time-is/
-Brian, WA1ZMS/4
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time-nuts mailing
I've spent a good part of the afternoon looking at all the plots, websites
and the few papers I could find mentioning the hanging bridge. As far as I
can tell as long as one is correcting for sawtooth there's nothing
additional to do about hanging bridges.
They merely show up as funny waveforms
j...@jtmiller.com said:
I've spent a good part of the afternoon looking at all the plots, websites
and the few papers I could find mentioning the hanging bridge. As far as I
can tell as long as one is correcting for sawtooth there's nothing
additional to do about hanging bridges.
They
This is how ELT locating satellites work (when not relaying the newer GPS data
bursts). Several on another list I watch suggested this pretty early on and I
guess INMARSAT got the message. I'd be curious to know if AFRCC pointed
INMARSAT in that direction.
Really shows the value of precise
I am surprised it took them this long. A number of satellite telemetry
systems can use doppler as a matter of course for locating transmitters,
such as Iridium and Argos.
David
On 3/25/14 12:58 AM, Peter Gottlieb wrote:
This is how ELT locating satellites work (when not relaying the newer
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