Hi, I'm in the process of setting up a public stratum 1 NTP server which
will have at least one standard as a fallback to GPS (and possibly WWV
and CHU), in addition to its primary purpose as a timebase for a
microwave active SETI transmitter. So far I have an aging = 1E-11
rubidium standard (
Hi, I recently bought an Austron 2010B, a disciplined OCXO standard with
adjustable disciplining parameters, for use as a clean-up oscillator and
a decent fallback to my Ball MRT-H, a rubidium standard. I figured that
the quartz standard's 1 Mhz and 5 MHz outputs are fine---the former is
exact
Hi, I'm unable to fully grasp the lifetime specifications of typical
COTS cesium standard physics packages, for both old and new designs.
For example, the documentation of an older HP standard specifies a shelf
life of two years if the ion pump is operated two or three times per
year, yet at th
On 09/29/2016 01:03 PM, Bob Camp wrote:
2) How long on average is the tube likely to be useful.
So you are implying that the package life is depleted at a roughly equal
rate regardless of whether the package is fully operating, has just the
pump operating, or is completely shut off?
-Ruslan
On 09/29/2016 01:50 PM, John Ackermann N8UR wrote:
2. Tube vacuum and other physical aspects that may deteriorate over
time, whether or not the tube is operating. The routine ion pumping
helps keep the vacuum up in storage, but is not as effective as the
continuous pumping that occurs during op
On 09/29/2016 02:02 PM, Bob Camp wrote:
The “operating” case will ultimately kill various parts in the
standard that would not die sitting on the shelf.
Oh, really? I thought that cesium depletion is essentially the only
real killer.
-Ruslan
___
t
On 09/29/2016 11:45 AM, Scott McGrath wrote:
It depends on the beam tube There is a fixed amount of Cs in any
given beam tube this pool of Cs is consumed during operation.Once
the Cs is depleted the tube will no longer function.It's possible
with intermittent use for the tube to run for
On 10/05/2016 01:17 AM, Chris Albertson wrote:
All that said, there is money to be made by spoofing time. If I can fool
a stock broker into accepting trades minutes late I could be rich.
Minutes? I thought the proper unit for that is nanoseconds :).
-Ruslan
On 10/26/2016 02:54 AM, Hal Murray wrote:
tsho...@gmail.com said:
I'm all for a diversity of systems - putting all our eggs in the GPS basket
seems unwise (and I maintain WWV receivers hooked to NTP at home!)
What is available in the way of WWV receivers? Anybody got a summary handy?
Yes,
On 11/03/2016 04:07 PM, Bert Kehren via time-nuts wrote:
Over the past there has been talk about building from scratch high
performance references. I think consensus was that it is out of reach.
What about instead establishing an open-source hardware project for a
frequency standard fusor?
On 11/03/2016 06:10 PM, Attila Kinali wrote:
On Thu, 3 Nov 2016 16:37:06 -0400
Ruslan Nabioullin wrote:
What about instead establishing an open-source hardware project for a
frequency standard fusor? I was researching COTS solutions for this for
my rubidium ensemble and could only find this
On 11/08/2016 12:16 AM, Skip Withrow wrote:
Hello Time-Nuts,
I recently acquired an HP 5065A rubidium oscillator (with 10811 10MHz
OCXO). I think I pretty much have it running now and have been letting it
cook for the last couple of weeks. I offset the C-field + and - and
measured the frequency
On 11/10/2016 07:18 AM, Peter Reilley wrote:
I have a few of those "atomic" clocks that receive WWVB to set the time.
However since I live on the east coast they may only pick up the signal
once or twice per year.
Could I implement my own personal WWVB transmitter that would
be powerful enough t
On 11/10/2016 05:10 PM, Artek Manuals wrote:
I think you have missed the point this is not so much about keeping time
down to the nano-second
I was suggesting NTP, not PTP.
The WWVB clocks being discussed here come in a plethora of decorator
styles and display varieties ( though most are old
On 11/10/2016 05:46 PM, Tom Van Baak wrote:
To be honest, this is very impractical and backward-thinking.
I would suggest instead upgrading to the Internet-of-things paradigm, replacing
these time-of-day displays with full computers running NTP and connected
to your LAN (Android smartwatches; rep
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, for use as fallbacks to the standard GNSS sources (each
site typically will have one military and one industrial civilian
rackmount GPS receiver).
-Ruslan
--
Ruslan Nabioullin
Wittgenstein Laboratories
rnabioul...@gmail.com
(508) 523-8535
50 Louise Dr.
Hollis, NH 03049
of the copyright and the patent to be absurd. That is
all that I will say, for I do not wish to excessively deviate from the
topic of discourse.
-Ruslan
--
Ruslan Nabioullin
Wittgenstein Laboratories
rnabioul...@gmail.com
(508) 523-8535
50 Louise Dr.
Hollis, NH
, but even that requires a separate receiver
unit].
''
The best approach would be to set up at least one HF AM receiver tuned to
WWV or CHU (preferably using a jamming-resistant antenna configuration),
connecting it to your NTP server, the daemon of which would use the NTP
WWV/CHU dec
a strong need for them, regardless of the sophistication
of the receiver, due to the pitfalls of GNSS.
-Ruslan
--
Ruslan Nabioullin
Wittgenstein Laboratories
rnabioul...@gmail.com
(508) 523-8535
50 Louise Dr.
Hollis, NH 03049
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ld be GPS based ….
Commercially-made cellular reference receivers obviously do exist (IT
folks tend to love them due to there being no need for outdoor antenna
requirements).
-Ruslan
--
Ruslan Nabioullin
Wittgenstein Laboratories
rnabioul...@gmail.com
(508) 523-8535
50 Louise Dr.
H
On 01/01/2017 12:07 AM, Chris Albertson wrote:
Just a comment for anyone who wants to log line voltage v. time. If
you have an APC "Smart UPS" battery backup unit these will log voltage
and frequency to a file. The unit connects to a computer via USB (and
an AC power cable).
As a more profes
Hi, looking at pictures of various time metrology equipment setups for
best practices and inspiration, I have commonly seen time of day display
unit(s) installed in racks containing processing or time transfer
equipment, e.g.,
http://www.xyht.com/wp-content/uploads/2015/05/Powers_Master_Clock.j
On 01/22/2017 07:26 PM, Hal Murray wrote:
Many years ago, I designed network gear. That was back when a controller was
a board full of small and medium sized chips rather than a single big chip.
I always put a few LEDs on the board wired up where the microcode could get
at them. Most of the tim
On 01/28/2017 06:58 AM, Anders Wallin wrote:
Hi all,
I've been tinkering with another distribution amplifier design and made
some measurements earlier this week.
Have you looked at the design of the HP/Agilent/Keysight E1750A (sine
timebase of various standard frequencies) and E1752A (PPS) VXI
On 02/02/2017 01:59 PM, paul swed wrote:
Well this is nice almost a 2 month long test.
So if you thought about seeing if you could receive eLoran on your Loran C
receiver this is a good opportunity. With respect to the data channel
pretty sure none of the receivers we have know or care about it.
On 02/02/2017 09:47 PM, paul swed wrote:
Ruslan,
Seems to be backward compatible. Yes.
All of my stuff works austrons and SRS 700.
Whats your location? The transmitter is in NJ and I am near Boston. So
somewhat close for me. My antenna is the standard boat preamp and whip
antenna. 6 foot off the
On 02/03/2017 09:53 AM, Bob Camp wrote:
With reasonable gear, you can pick up the European Loran chains in
the US on a regular basis. You can also pick up the Russian system
that runs on the same frequency. The gotcha there is that you are
looking at “skywave” rather than “ground wave” signals to
On 02/03/2017 10:02 AM, paul swed wrote:
Ruslan
NH will be easy to pick it up. The core frequency is 3 Cesiums in a
cluster. As for time transfer it can but its really a pain in the
backend and that information is indeed in the data channel. So make
us jealous with your CS and RBs. :-) I am down
Hi, any ideas on what the Austron Synchronous Filter 2090A is for? I
couldn't find it in the '88 catalog. I recall seeing some hits for it
in old unclassified DoD R&D publications in the past, wherein it was
used as part of an experimental LORAN reception setup.
-Ruslan
_
On 02/05/2017 02:58 AM, Poul-Henning Kamp wrote:
I belive [sic] the idea is that if you have two Loran-C receivers
tracking two different GRIs, the 2090A can blank out the strongest
stations [sic] pulses for the weaker chains [sic] receiver.
So it functions sort of as a preselector, one whose u
So any ideas on how likely it will be that eLORAN becomes deployed with
at least partial US coverage within the next 5--10 years? There exists
a solid company working on its R&D (UrsaNav), apparently increased
awareness in government, and UrsaNav entered into a partnership with
Spectracom for
On 02/06/2017 09:06 PM, Bob Camp wrote:
On Feb 6, 2017, at 7:38 PM, Ruslan Nabioullin
wrote:
So any ideas on how likely it will be that eLORAN becomes deployed
with at least partial US coverage within the next 5--10 years?
No, this is not the world as I would like it to be. It is the world
Hi, generally speaking, what are the performance differences between the
following: 1. direct RS-232 (i.e., what I believe is a standard PCI card
offering RS-232---essentially UARTs interfaced more-or-less directly to
the PCI bus); 2. RS-232 via USB; 3. PPS decoding PCI cards (which might
also
On 02/15/2017 01:17 PM, Chris Albertson wrote:
Why set up a dedicated NTP server if you only have two computers
that will use it?Your server will be accurate to a few
microseconds but your two computers will only by good to a few
milliseconds because ethernet is not nearly as good as PPS.
W
Bob Camp wrote:
> Once upon a time it was done with a mechanical marvel of a device.
And before those electromechanical contraptions, there was this :):
https://en.wikipedia.org/wiki/Speaking_clock#/media/File:1937TimeVoice.jpg
-Ruslan
On Thu, Feb 16, 2017 at 1:18 PM, Bob Camp wrote:
> Hi
>
>
ne site is active (albeit experiencing some technical
issues), Anthorn. In particular, more detailed information, analysis,
and predictions on these efforts are sought.
Thanks in advance,
Ruslan
--
Ruslan Nabioullin
Wittgenstein Laboratories
rnabioul...@gmail.com
(508) 523-8535
50 Lo
Excellent!! Do you know why the testing periods terminate, and
whether Wildwood will return back on air?
-Ruslan
--
Ruslan Nabioullin
Wittgenstein Laboratories
rnabioul...@gmail.com
(508) 523-8535
50 Louise Dr.
Hollis, NH 03049
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ivers (e.g., an old ISA card).
-Ruslan
--
Ruslan Nabioullin
Wittgenstein Laboratories
rnabioul...@gmail.com
(508) 523-8535
50 Louise Dr.
Hollis, NH 03049
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> and follow the instructions there.
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Ruslan Nabioullin
Wittgenstein Laboratories
rnabioul...@gmail.com
(508) 523-8535
50
timecode but only a PPS signal and a status code (J6 in
http://www.n4iqt.com/lucentgps/small_notes_rftg-m-xo.jpg ).
--
Ruslan Nabioullin
rnabioul...@gmail.com
rnabi...@student.umass.edu
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