I wonder if there is a way to get a voltage standard out of a frequency
standard (GPS Disciplined).
I think the big problem is probably voltage stability due to temperature
variations.
Any thoughts on this ?
-George
On 11/10/2016 02:17 PM, paul swed wrote:
> Perry,
> Thanks for pointing them ou
Nice article on NIST and NTP.
http://spectrum.ieee.org/tech-talk/computing/networks/meet-the-guy-whose-software-keeps-the-nations-clocks-in-sync
-GKH
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Slashdot got it.
http://it.slashdot.org/story/16/01/26/1735223/discrepancy-detected-in-gps-time
On 01/26/2016 12:20 PM, Scott Newell wrote:
> At 09:12 AM 1/26/2016, Paul Boven wrote:
>
>> Has anyone else seen GPS time jump by -13.7 usec today?
>
> My tbolt locked ntp server saw an unusual spike o
Hello everyone,
In the past there have been several posts about
amplifier input and AGC. As many have pointed out
this is always a bad idea since the AGC circuit
tends to add phase noise, etc.
So my question today is: Is this still true?
My old Panoramic spectrum analyzer (yeah, she's a beauty!)
ard, the answer will
> be a bit different than if you are starting with a surplus OCXO and trying
> to drive a 5334 :)
>
> Bob
>
>> On May 22, 2015, at 4:27 PM, xaos wrote:
>>
>> After reading the posts on this subject I have a question.
>> First, in my exp
After reading the posts on this subject I have a question.
First, in my experience I used a rather simple circuit made from
diodes used as limiters and a transistor feeding
a logic inverter. No AGC.
So here is my question. What is the proper circuit to use?
I'd like to do a PSPICE and check things
You have to give the guy credit for trying.
What is a shame here is that he did not
publish the schematics and the source code.
If anyone knows him he should just ask him. We tend to
be sceptics here but that's the nature of the game.
However, I don't want anyone to think that we are elitist.
I r
When LIGO was announced I read up on it as much as I could.
The problems seemed enormous.
Bob Darlington mentioned shock mounts. That in itself seemed
like a show stopper.
Then I think there was some kind of accident. Anyway
these guys did finish the LIGO. But unfortunately
no space differential
I don't know if this is the right time to ask this but here goes.
I have started a design for a linear power supply for the Beagleboard
5V 5-10A. Over-Voltage, short circuit and temp protection.
Very low ripple and HF noise.
I have been watching this thread and I am still not sure
what device wou
Hello everyone,
If anyone is interested, I have created a HOWTO
on running a Motorola GPS receiver connected to
a CentOS 7 box via serial port (com1), with 1PPS over DCD.
Here is the documentation.
http://www.maximaphysics.com/Centos_7_GPS_Setup.html
Let me know if something does not look right
Brian,
Sorry about the long post.
I was on a similar path recently. I wanted to create
a nice and simple Stratum 1 server using a beagleboard.
In addition, I wanted to create a nice case for it
so I would enjoy looking at it from my desk.
Since I was already using a GPS Motorola receiver to
crea
Hello everyone.
Currently my Stratum 1 NTP server is made up of the following:
Pentium 4 Motherboard, Single core, 1.4GHz., 1GB memory
Slackware Linux, 11.0.0
PPSkit-2.1.7 Kernel
uname -a:
Linux timelord 2.4.33.3-NANO #1 Fri Nov 12 21:28:51 EST 2010 i686
pentium4 i386 GNU/Linux
Motorola, GPS Rec
The cheaper unit has no patch wires. Interesting.
Seems that he put a lot of work in the unit.
Too bad the information on the software is non-existent.
Cheap enough though.
-G
On 11/18/2014 07:24 PM, Bob Camp wrote:
> Hi
>
> I’d say this has the look of a hobby / semi-pro project. I’ve seen seve
-pete
>
> On Tue, Nov 18, 2014 at 3:34 PM, xaos wrote:
>> This is the strangest unit I have ever seen.
>> No documentation.
>>
>> Morion OCXO
>> http://www.morion.com.ru/eng/
>> From St. Petersburg :)
>>
>> I cant make out any part number.
This is the strangest unit I have ever seen.
No documentation.
Morion OCXO
http://www.morion.com.ru/eng/
>From St. Petersburg :)
I cant make out any part number.
except this number on the front panel:
06109a_y145_09
Google gives me nothing.
I might buy one just for the hell of it.
-George
On
impedance adapter, so I suggest to made it as described or
> using a smaller core.
>
> Luciano
>
>
>
>
> On Thu 13/11/14 3:30 PM , xaos wrote:
>
>> Luciano,
>>
>> This looks very nice. However, the inductors are
>> custom made. It would be nice to ha
Luciano,
This looks very nice. However, the inductors are
custom made. It would be nice to have a
off the shelf parts solution so it can be made
easily.
Any ideas ?
-George, N2FGX
On 11/13/2014 08:39 AM, tim...@timeok.it wrote:
> Hi all,
>
> I can suggest a different solution I have tested to ha
As far as I'm concerned there are no more DIP parts.
However, let's not give up yet. Although
I am not a high volume manufacturer, I found
a nice way around it.
First, forget about prototyping by hand. That
ship has left.
So, I use OrCAD/Cadence (CIS/PCB Editor)
from the start in order to create
It seems that this program will not work for Win 7.
Has anyone attempted to decompile this thing?
Maybe re-work a bit and have it run on anything?
-George, N2FGX
On 11/07/2014 01:34 PM, Bob Stewart wrote:
> Hi Bill,
>
> I think I got my copy here. I used the bottom one. I don't know what a
> 5
or spare parts"
>
> They are surplus guys have no idea what the thing is. They have someone
> suggesting the T&M vaule based on model number only.
>
> Can't loose
>
> -pete
>
> On Thu, Nov 6, 2014 at 10:16 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <
>
I just cant figure out what it is ;)
http://www.ebay.com/itm/HP-Agilent-5071A-Primary-Frequency-Standard-/191386439159?pt=LH_DefaultDomain_0&hash=item2c8f854df7
One obvious question: Are the leftover parts worth anything close to the
opening bid ?
-George, N2FGX
_
Why Strontium over Caesium?
Is it because it just sounds more hi-tech ? LOL
Maybe stupid question to most here, but I do
not know the answer.
-GKH
On 11/03/2014 12:59 PM, Chris Albertson wrote:
> On Mon, Nov 3, 2014 at 8:17 AM, xaos wrote:
>
>> Small correction: The numbers
elativity Einstein/Essen Anniversary Test
>
> Bob
> From: xaos
> To: time-nuts@febo.com
> Sent: Monday, November 3, 2014 10:17 AM
> Subject: Re: [time-nuts] NPR Story I heard this morning
>
> Small correction: The numbers were 10E-16.
>
> One import
requency standards. They actually used
> numbers like 10E16 in the story. Apparently at that level your clock can
> measure a change in elevation of a few centimeters because of the
> relativistic effects of the reduced gravity field in just a few cm.
>
> On Mon, Nov 3, 2014 at 6:28 AM,
This morning, as I was driving to work,
I heard this really cool story on NPR radio here in NYC.
This is the link to the story:
http://www.npr.org/2014/11/03/361069820/what-time-is-it-it-depends-where-you-are-in-the-universe
What a nice way to start the week.
Past stories with similar headlines
Tom,
Thank you and nice to be back!
Was working major hours for a while.
Workin' for a living :)
Now, I must confess that this project is sort of a
milestone for me.
Those who hate kids (I know you are out there !)
can stop reading now :)
My daughter, who just turned six, has been very curious
Err... I meant packs of cigarettes
NOT cartons :)
Quoting x...@darksmile.net:
The miniITX mobos are quite impressive.
There is no argument there.
However, My simple idea was this:
Since I want to keep time at 3 separate locations
and wanted stratum 1 NTP, I didn't want overkill.
Actually my
The miniITX mobos are quite impressive.
There is no argument there.
However, My simple idea was this:
Since I want to keep time at 3 separate locations
and wanted stratum 1 NTP, I didn't want overkill.
Actually my reason for 3 different locations is simple:
Internet is flakey some places and so
Annoyance with small Linux boards:
My single biggest annoyance is that
all the I/O connectors are coming out from
all 4 directions.
What I mean is this:
It would be nice to have ethernet+LEDs+USB+VGA(HDMI)
come out from one side, and Power/I/O/RS232
from the opposite side.
This way if I make a
Michael,
Thank you for your most valuable information.
This is why time-nuts is so amazing!
My goal is actually two-fold.
First, I would like to have a NTP server that I can easily
hook up (well, as easily as possible) without
dedicating a Linux server each time.
My personal use would require
Hello everyone,
I started a new project for myself where I would use the RasperryPi
Linux board
as a NTP server.
My goal is to design a custom board for the Pi and mount a GPS
receiver on it. With this combination, I should be able to configure
NTP for the Pi and thus have the Pi act as a
Love it!
You just brought to mind one of the least known (but best) true
stories about Linux, Windows big money and even bigger BS.
This is an absolutely 100% true story:
September 8, 2008 was the busiest Forex trading day in the history of
stock markets.
On that day, the London stock ex
With the recent wild fluctuations in the Commodities markets it is
incredibly important that time delay between any 2 parties (in a
financial transaction) be reduced to a minimum.
Only a few years ago, gold, silver and oil would vary by a few dollars
(at most), intraday and even intraweek.
You are right.
To be more precise, I should have said that the time sync should be at
least 1 order of magnitude less. In the case of <10us turnaround time,
it is assumed that the timesync is <1us. This is the reason that
everyone uses multiple stratum 1 NTP servers using GPS in their
dat
You can forget Wall St. firms and Banks for starters.
They need sub-microsecond accurate timing as some instruments (Forex)
are moving to <10 microsecond latency from order entry to order ack.
Although some software (FIXX) needs a lot of work to get there, they
are moving in that direction.
I wonder if there is any value to performing a FFT on the data.
-GKH
Quoting jimlux :
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a conveni
It is not cynicism if it is the truth.
The previous head of the FCC was none other than the son
of Gen. Colin Powell: Michael K. Powell.
The same Powell who allowed Verizon (and other telco's)
to stop sharing their lines and as a result made the
price of DSL skyrocket.
The Powell who pushed for
Only to die and in a split second the mysteries of the universe
will open to you and you will realize that "time" was relative and
subjective and can be varied by certain "jokers".
And, most importantly, your grandfather's "grandfather clock"
(you know, the one in the living room with the gargoyl
A valid point has been brought up. What does a Time-Nut do with his
equipment when he dies.
Actually, I am serious here.
My little girl, who just turned four, is already an expert with the
soldering iron and she can name most components. Actually she is very
good with microwave components
This was the story at Slashdot today.
http://hardware.slashdot.org/article.pl?sid=07/12/11/0517234
I bet some of our guys (febo, leapsecond) are seeing an increased
volume as well.
-George
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Bruce Griffiths wrote:
> George
>
> In the JFET frequency doubler:
> 1) Surely the 50 ohms should be is series with the the voltage source V3
> for the simulation?
>
Correct. I did a cut and paste "without rotate" there.
> 2) Usually a 1:4 impedance ratio step up transformer on the input is
> ab
Hello Everyone,
I have been running simulations of different parts of the Fury Interface
board.
Here are the results so far.
http://www.darksmile.net/ee/index.html
Your feedback is most welcome.
-George
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Hello everyone,
Shall we consider 5MHz OCXO's?
I have a BUNCH of those. Most are really low end devices but I also have
a few gems.
I mean, some people might have a really nice 5MHz OCXO. Why exclude
them, if we don't have t
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Hello everyone,
Needless to say, but I have also been following this discussion closely.
First, I must confess, I started this project without making clear
what my requirements were.
Personally, I knew what I wanted. However,
); SAEximRunCond expanded to false
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It is funny how things you forgot a long time ago have a way of coming back.
Case in point. I was just running some simulations on the EFC
interface and then I had this idea.
Wouldn't an instrumentation amplifier be the righ
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Said,
In this particular case, I would solder a "single header pin", to each
hole in the OCXO footprint, and then use a "single wire header
connector" to attach to it.
Then, have all 4 wires connect to the interface board
); SAEximRunCond expanded to false
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Bruce,
>>
> If this board is intended to power an HP10544A some provision for the LC
> power supply filter required by this oscillator should be made to avoid
> adding large oven switching frequency related spurs to the oscilla
); SAEximRunCond expanded to false
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Said,
>
> Hi George,
>
> nice design!
Thanks :)
>
> Here are some thoughts from my side:
>
> The LT1208 has a fairly significant Voffset-versus-temp sensitivity. Maybe a
> part like the LTC6244HV with about 1/10 the offset d
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Hello everyone,
The Fury Interface board is closer to reality!
I think I have included everything in there. At least the things that
I would like to have. However, I am sure that the members of time-nuts
will add many sugg
); SAEximRunCond expanded to false
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Hello everyone,
Does anyone know the input resistance of the EFC pin for the
HP 10544A and 10811-6011 OCXO's?
I have the spec sheet but it is not listed.
Can I assume something like 50K? This the the value for Crystek device
); SAEximRunCond expanded to false
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Hello everyone,
I was hacking away at the Fury and I decided that I needed an
interface board to go along with it.
So, I fired up my capture/layout program and so far this is what I have:
First, the Fury board will attach t
); SAEximRunCond expanded to false
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Said,
Can you please send me the Paypal info as well?
-George
Quoting [EMAIL PROTECTED]:
> ); SAEximRunCond expanded to false
> Errors-To: [EMAIL PROTECTED] RETRY
>
> Hello guys,
>
> we are ready to start shipping the Fury u
); SAEximRunCond expanded to false
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Imagine that, an accurate story from foxnews.
Didn't even have the obligatory jab at the Democrats.
-G
Quoting "James R. Gorr" <[EMAIL PROTECTED]>:
> ); SAEximRunCond expanded to false
> Errors-To: [EMAIL PROTECTED] RETRY
Count me in for two units please.
George Hrysanthopoulos, N2FGX
>
> I would also be interested in one.
>
> Thanks
> Don Mimlitch
>
>
> -
> Need Mail bonding?
> Go to the Yahoo! Mail Q&A for great tips from Yahoo! Answers users.
> ___
Keith,
I have written a Linux based program that interfaces with many
Motorola receivers and provides a command line interface
for all functions.
In addition, it can also talk with HP Z3801A receivers, generate
plots of receiver functions and create HTML output of receiver
variables.
Some exampl
Here is another 8 port item on eBay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230088874313&fromMakeTrack=true
It looks like Tucker is really cleaning out their inventory on this item.
I know John picked up one and I got another as well.
They are very nice units and you can't beat the
These boxes used to go for 300-400 and they are definitely worth that.
I will bid on it just in case...
Now, I also like item: 230079813050
Agilent HP 58517A GPS L1 Distribution Amplifier
I have two of these babies and I can always use another one.
Last time, I picked up one for 130.00. De
Hello everyone,
I have, until now, resisted the urge to buy a GPS navigation system for
my car.
However, I now have to do some traveling and new and unknown addresses
keep popping up.
There are several different GPS units on the market and they all look OK
(i guess).
I just want to know which
Mangus,
>
> > Now, to the more problematic issue of time delay between
> > :SYST:STAT? invocation and receiver response.
> >
> > I just wish that the information in the :SYSTEM:STATUS?
> > command was available separately.
>
> Much of it is. I have reverse-engineered the actual SCPI command stru
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First,
>Ah, much better. After batteling the perl package hell (i.e. finding the
>exact right Debian package that will make it tick) I now have it
>running, but
>now I need to figure out how to make it tick on automatic. I also
>commented out
>the "cd /opt/ntp/timelord/shm || exit" line from the G
Magnus,
Arghhh... I forgot to include it in the build script.
It is there now as version 2.0.3. I double-checked and the file is
definitely there!
http://www.gs3tech.com/Software_Download.html
-GH
Magnus Danielson wrote:
> Oh... eh... George?
>
> README:18: "gpschart" is included in this
Joe,
Thank you for the kind words :)
Actually, there is a new version there (2.0.2 as of a few minutes ago)
that fixes a few spelling errors.
-GH
>
> I just took a look at your software. You are to be commended on your clear
> and detailed documentation. Most GPL software documentation seems t
Magnus,
I have written a Linux based control and graph
application for the HPZ3801A. The software also
controls Motorola GPS Receivers.
It is curses based and also generates graphs
of Holdover Uncertainty and EFC (TI values are also stored).
For some graphs of my two Z3801A's look here:
http://
t out. Estimate at least.
Sorry, just thinking out loud.
-GH
Rasputin Novgorod wrote:
> --- xaos <[EMAIL PROTECTED]> wrote:
>
>
>> 8-way splitters
>> Make sure it passes DC. Your antenna will need it.
>> Pass the DC from one port and block it from all others.
&
I gotta say this about eBay, if you wait long enough you
will get what you want.
Specifically, I bought 2, 8-way splitters for $100.00 each from The
Tucker store.
Both had the power connector which was a SMC connector (I believe).
Takes 5Volts to make it run even though the markings indicate that
Hello everyone,
In my daily eBay search for (gps*, distrib*)
I found item: 330012701666
http://cgi.ebay.com/Distribution-Amplifier-6-Way-Output-MWT-Powered-Divider_W0QQitemZ330012701666QQihZ014QQcategoryZ25392QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
which is an 806-849 MHz Distribution amplifier.
Well, except for the fact that it had no output
it was fine ;)
Seriously, though. $100.00 is a bargain for that box.
If you got lucky and the bad parts were not some
custom jobs you'd have a very nice function
generator.
Looks like I have to pay a bit more though...
-George
>
> Here's one that
Hello everyone,
I found this HP3325B Function Generator on eBay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270006696082
It has the high voltage option but not the High Stability Oven.
Since I plan to use an external GPS based frequency source,
does it matter?
I suspect the unit still
Hello everyone,
I have released Version 2.0 of Darkgps, the GPS receiver
control software.
DarkGPS consists of a Linux based, open source, software suite that allows
you to fully control your GPS receiver. The software supports
all 6, 8 and 12 channel Motorola GPS receivers and the
HP Z3801A, GPS
Hello Randy,
Your web site is a gold mine of Motorola GPS Receiver info.
I hope to incorporate all the Motorola commands into my program.
Regards,
-George
Randy Warner wrote:
> Xaos/George,
>
> You can download the entire VP (6 and 8 channel) command reference on
> our website.
Thanks Brooke and SJ for the quick response.
SJ: Unfortunately, I can't use the WinOncore12 program as it runs on
Windows. Recently I shut down my last Windows box and
I am running all Linux.
The problem is that I was using TACC32 Software from CNS Systems
to control my Motorola Receivers and th
Hello Everybody,
Does anyone here know what the Motorola Oncore "@@Bk"
command does? It is from a "Basic" 6 channel Model.
More importantly does anyone have the docs for it?
Many hanks in advance,
-George, N2FGX
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Hello everyone,
My company, GS3 Technologies Inc., is running
a promotion for a PIC based, Single Board Computer
Development System.
Anyone who registers (only email address required)
at our website:
http://www.gs3tech.com/
will be eligible to win. The drawing will be on March 1st.
The Develop
I am looking at the Gpscon software display.
Hal Murray wrote:
>>My two HP Z3801As are still showing Leap Second pending.
>>
>>
>
>Are you talking about the raw data from the Z3801A or the output of NTP
>servers they are connected to?
>
>My Z3801A turned off the leap bit as expected.
>
>53735
My two HP Z3801As are still showing Leap Second pending.
My two Motorola Oncores changed right away.
My Trutime Irig-B GPS synchronized generator did something cool.
It did not switch right away but it showed that it was in special mode
and it made the correction about 10 seconds later.
NTP has f
You might have a bad battery in there.
Sometimes these things save the configuration in
battery backup-ed RAM.
-George
>
> Hello everybody,
> my name is Arnold, located in southern Germany, and I am quite new
> joining this very interesting group - I got as well the fever of precise
> timing,
Hello everyone,
What does the group think about Orcad/Pspice
vs. Electronics Workbench for circuit design
and simulation.
They are both mega-dollar software so the wrong
decision could be a major problem.
Personally, I have been a fan of Orcad Pspice since
my college EE days.
Also, I can't fin
This unit might be 75Ohms.
George, N2FGX
Mike Feher wrote:
This is for general information in case someone else needs an inexpensive
distribution amplifier for a frequency source. Just yesterday I received the
following distribution amp that I purchased on ebay -
http://tinyurl.com/bqalz . So
Hello Everyone,
I am in the midst of a design for a
new custom CPU board. I decided
to include NTP, in the board software,
for time keeping purposes.
The system is working rather well and
I am able to get millisecond time sync.
BTW this is as good as I'll get
on this hardware.
The background is
Hello everyone,
This is my first posting to Time-Nuts so please bear
with me if I don't have the proper etiquette.
I guessed that many members here have the
HP5370A(B) counters.
I have 1 5370A and 2 5370B.
For some weird set of circumstances,
all three units failed withing 1 week.
The problem
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