I have ordered a ST620 and decided to get a hard copy manual. But the
thoughts of paying Stanford Research $100 for one are not overly
attractive. A more sensible approach to me is to download the manual and
get it bound. I found a company in the UK that can do it for a lot less.
I thought it
I have a pdf file in which I have already reunited the user manual, the
schematics, several application notes. The format of the pages are mixed: most
of the manual is in A4/Letter, the schematics are in A3. I have added a full
table of contents, in bookmark format.
The size of the file is
On 10 December 2014 at 10:09, Jean-Louis Oneto jl.on...@free.fr wrote:
I have a pdf file in which I have already reunited the user manual, the
schematics, several application notes. The format of the pages are mixed:
most of the manual is in A4/Letter, the schematics are in A3. I have added a
I see this on eBay - it might interest some, and at $10 it will not
break the bank
http://www.ebay.ca/itm/1968-Scientific-American-Magazine-Cesium-Clock-Standards-Measurement-DNA-Dis-/381078816062
BTW, does anyone know why the Amateur Scientist column was dropped in
Scientific American? Perhaps
Hi
They have been around for a couple of years now. I posted a plot comparing one
to a KS box back about a month ago.
1) They work with Lady Heather (a big plus)
2) They do not have variable loop settings like a TBolt (a minus)
3) Their ADEV peaks “a bit” just like an un-adjusted TBolt, but
Hi
The antenna connectors on the front of the KS box are TNC’s ….
Bob
On Dec 9, 2014, at 9:13 PM, Joseph Gray jg...@zianet.com wrote:
Paul,
Thanks for the info. I have been following most of the discussion on
these units. I have even saved several posts, so that I could
reference them
Hi
On Dec 9, 2014, at 9:46 PM, Angus not.ag...@btinternet.com wrote:
On Sun, 7 Dec 2014 19:34:02 -0500, you wrote:
Hi
On Dec 7, 2014, at 7:15 PM, Angus not.ag...@btinternet.com wrote:
On Sat, 6 Dec 2014 11:47:10 -0500, you wrote:
I am looking forward to long term data on the
Hi
The noise level of most micro’s is pretty poor. I’d just go with any of the
many IC multipliers. They all will get the job done without much effort. You
can do an adequate job in this caee with an X-OR gate with an R/C to one input.
(clock goes direct to one input, delayed version (via
Dave I do not know why but it was one of two things as I barely recall.
Magazine format change (Need dumber for more readers) or the fellow died.
That was a long time ago.
I know as a kid that inspired me on more then one occasion to do something.
They are still a good read. there was some pdfs at
On Tue, Dec 9, 2014 at 4:47 PM, lincoln linc...@ampmonkeys.com wrote:
Hello,
I'm having a dumb idea, I have an MCU that uses a 20 MHz VC-TCXO.
The micro, among other things, runs a loop and correct the oscillator by
using a 1pps from a gps. I have a 10 MHz mv200 that I would like to
Hi Dave, as a long time reader (since 1955) and subscriber I remember the
Amateur scientist pages ending in the 1980s. I think the contributer
retired. At around that time I think the many adherents formed the Society
of Amateur Scientists. Though I have not visited fot several years the web
On 12/10/14, 6:31 AM, Alan Melia wrote:
Hi Dave, as a long time reader (since 1955) and subscriber I remember
the Amateur scientist pages ending in the 1980s. I think the contributer
retired. At around that time I think the many adherents formed the
Society of Amateur Scientists. Though I have
Good morning,
who has asked me for the service manual ?
73 de Ulrich
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On Wed, Dec 10, 2014 at 8:31 AM, Alan Melia alan.me...@btinternet.com
wrote:
Hi Dave, as a long time reader (since 1955) and subscriber I remember the
Amateur scientist pages ending in the 1980s. I think the contributer
retired. At around that time I think the many adherents formed the Society
That link leads to Semester At Sea -- but a little googling finds
something useful: http://amasci.com/
I think the biggest loss from Scientific America was Martin Garners
Mathematics Puzzles. Everything from LISP to Conway's Game of Life...
On Wed, Dec 10, 2014 at 10:07 AM, Jim Lux
Ulrich
I had asked for the manual.
Also let me know when the Lucents arrive.
Regards
Paul
WB8TSL
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Hi David,
Yes, You mean the hourly dips? That is caused by the the VLF receive
software that
is running on the same PI. It makes hourly recordings of DC to 24 Khz
with a USB soundcard. The CPU is running at max capacity most of the
time.
Perhaps it is now time for a dedicated PI, that only has
OK now I will get into trouble.
There isn't a need for doing these types of things anymore as we are
turning into a consumer society. Shame.
Better end this thought right now because it certainly is not Time-nuts
worthy.
Regards
Paul
WB8TSL
On Wed, Dec 10, 2014 at 10:07 AM, Jim Lux
There are a number of ways to multiply-up the 10 MHz, but what about
just changing things around to make the 20 MHz VCTXO phase-locked to
the 10 MHz OCXO, and then discipline the 10 MHz. There will be phase
noise issues, whether doubling one thing, or dividing the other by
two, but overall, I
Graham make sure you read up on dtb and fdt. Many if not most distros don't
have what you might call a default.
On Tuesday, December 9, 2014, Graham / KE9H ke9h.gra...@gmail.com wrote:
Dan: Thanks. I don't know where you were quoting from, but it was the
answer I needed.
Paul: I found
Gents-
I don’t know if everyone is aware, but the USB PPS out is basically useless on
both my units - at least 200us off if not more.
Make sure you’re using the PPS OUT and not trying to measure on the DCD of the
USB int, as is easy to be drawn to do.
NS
From: David J Taylor
Gents-
I don’t know if everyone is aware, but the USB PPS out is basically useless
on both my units - at least 200us off if not more.
Make sure you’re using the PPS OUT and not trying to measure on the DCD of
the USB int, as is easy to be drawn to do.
NS
On Sun, Dec 7, 2014 at 3:10 PM, folkert folk...@vanheusden.com wrote:
Regarding the fs error
As an aside: this thread is like a zombie. Folkert's reply was to my post
from March
2014
in response to Henry Hallam who was replying to a message from
Gabs Ricalde posted in June 2013.
I suppose I
On Wed, Dec 10, 2014 at 11:41 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
But having the PPS on the DCD over USB
I'll admit, to my shame, that I have yet to deduce how to use USB provided
DCD for PPS.
I've looked, really I have but to no avail.
I see that the code has been in
I'll admit, to my shame, that I have yet to deduce how to use USB provided
DCD for PPS.
I've looked, really I have but to no avail.
I see that the code has been in the driver circa Linux 2.6 but I'm just not
making the connection.
Can't comment on
Don’t do it.
Quite simply - if you either execute ldattach pps /dev/ttyUSBx, or are running
GPSD (recommended) it will bind the USB appropriately to a ppsapi instance.
Do not do it. You will not approve of the results.
From: Paul
Sent: Wednesday, December 10, 2014 9:03 AM
All -- Ulrich has been having some AOL-related problems with the mailing
list. Anyone who wants to contact him about the SMIQ manual should
contact him directly rather than via the list.
Thanks,
John
On 12/10/2014 10:50 AM, paul swed wrote:
Ulrich
I had asked for the manual.
Also let
If you go to the amasci.com link they have a CD with all of the Amateur
Scientist columns in it. It was amazing what some of those guys did way
back then in a garage or basement.
-
Message: 6
Date: Wed, 10 Dec 2014 10:20:16 -0500
From: Paul Alfille
On Wed, Dec 10, 2014 at 12:17 PM, gign...@gmail.com wrote:
Quite simply - if you either execute ldattach pps /dev/ttyUSBx, or are
running GPSD (recommended) it will bind the USB appropriately to a ppsapi
instance.
I can get a /dev/ppsN but ppstest says time-out. I saw some hints that the
I've been uncomfortable with this KS since I got it; even having to return the
REF-0 unit for comms problems. Now that I have the PRS45A, I think I've proved
that the KS does have a problem. Has anyone else had something like this plot
shows? Any idea what's causing it? I'm not seeing
I'm experimenting a bit with time keeping.
For that I use cheap low power hardware like raspberry pies and
arduinos.
Hi people,
Thanks for all the replies! Took a bit to respond but I had the flu.
My objective is, to get the best precision/accuracy possible with said
hardware.
The first
John
I am just realizing that the way I respond may unintentionally show up on
time nuts. Thanks think I have my mistake figured out.
Regards
Paul
WB8TSL
On Wed, Dec 10, 2014 at 1:13 PM, John Ackermann N8UR j...@febo.com wrote:
All -- Ulrich has been having some AOL-related problems with the
Hi Lincoln,
On 12/10/2014 03:49 AM, Dave M wrote:
lincoln wrote:
Hello,
I'm having a dumb idea, I have an MCU that uses a 20 MHz VC-TCXO. The
micro, among other things, runs a loop and correct the oscillator by
using a 1pps from a gps. I have a 10 MHz mv200 that I would like to
try to use.
Hi Charles,
These hiccoughs match the ones I was getting comparing the KS to my homegrown
GSPDO, so I don't think there's any chance it's the PRS45A. I was wondering if
it might be the antenna. My homegrown unit uses the same antenna via a GPS
Source MS-14 splitter, but the LEA-6T in my
Jeaen-Luis wrote:
The size of the file is around 5.5 MB.
Let me know if you are interested, and how I can send it to you.
You can post it to k04bb.com:
http://168.144.151.127/manuals/69.143.130.128/1_Upload_Instructions.php
Best regards,
Charles
david-tay...@blueyonder.co.uk said:
But having the PPS on the DCD over USB is not as useless as you might first
think, because in tests here using the DCD/PPS over USB produced better
results with NTP than an internet connection alone. It is worth checking -
your results may differ.
The
Bob wrote:
This plot is the phase difference between the 10MHz from the KS vs
the 10MHz from the PRS45A.
Assuming the hiccoughs were the KS and not the PRS, it looks to me
like you recorded two periods where the KS lost tracking. Did you
have a good, outdoor antenna with clear view of the
On Wed, Dec 10, 2014 at 3:37 PM, Hal Murray hmur...@megapathdsl.net
wrote:
Linux has two APIs to PPS.
I'm using gpsd 3.9 which uses PPS-API if available. It pushes LD 18 and
just like using ldattach there's no output.
Both result in:
[ 7668.796593] pps pps1: new PPS source usbserial0
[
Hi Adrian,
Phase ns times 10 would mean you divide by 10 to get the phase in ns, right?
The script I used to plot this is a general purpose script that matches the
100ps resolution of my TIC. Sorry for the confusion. I may have to make a
separate script to use for this sort of thing.
As to
Charles, I have what I have. No, I do not have a 360 degree view of the sky,
and that's not likely to change for some time. I have the southerly 180
degrees from about 20 degrees elevation and up. I bought this KS as an example
reference for my homegrown. It may be that it's just not up to
Bob,
please describe your test setup more detailed.
There are a few points that I don't understand.
A phase difference of 6000 ns (600 ns times 10 as by the scaling of your
plot) between two 10 Mhz signals doesn't seem to make sense to me. That
would be 6 full periods of a 10 MHz signal.
And,
Some of the Arduinos (not sure about Mini 04 but I am suspicious) use
ceramic resonators rather than real crystals and thus may have extremely
poor frequency stability. See here
http://jorisvr.nl/arduino_frequency.html
for an example.
Is there some reason you are using a 16.9344 MHz oscillator
Time-nuts,
Is it a bad idea to have more than one PPS source on a single machine? Would
this cause additional jitter when trying to compare the timestamps on two
sources? I understand that USB can't deliver a real PPS, but what about using
onboard serial ports or a PCI card?
Thanks,
Laszlo
In the past few months, we have had lots of issues with private emails going to
the whole list. Especially AOL. One of these days, it could get really
embarrassing. Can't figure it out, yet. Meanwhile, please double check what you
post to/cc/from.
/tvb (i5s)
On Dec 10, 2014, at 11:37 AM,
I just uploaded the file to K04BB. com.
Best regards,
Jean-Louis
On 10/12/2014 19:10, Charles Steinmetz wrote:
Jeaen-Luis wrote:
The size of the file is around 5.5 MB.
Let me know if you are interested, and how I can send it to you.
You can post it to k04bb.com:
Tom
Thanks
What I just realized is I need to check the email address carefully. I
thought the little envelope in gmail was a direct address. I am unsure I
have figured it out correctly yet but will keep an eye out to see if I can
figure out whats up.
Regards
Paul
WB8TSL
On Wed, Dec 10, 2014 at
Hello list,
same guy who direct-wired a STP2390C into a HP5334A earlier this year
back here again. As a christmas holidays nano-project I made a little
PCB to have a nice plug-in module instead of a snake nest. Today the
boards arrived from the factory, and it was a lesson in dont try to
Bob wrote:
My homegrown unit uses the same antenna via a GPS Source MS-14
splitter, but the LEA-6T in my homegrown is probably a better
receiver than the UT+. I'll have to pull the splitter out of the
circuit to see if the KS doesn't like it. Maybe I'll just try a
different port first, as
Well, I am hoping to get to the point where the path to using the BBB as an
NTP server using the PRU for more precise timing, and using the LTE-lite to
provide the 1pps and time data. Of course, the LTE-lite can also provide
1pps and 10MHz to my workbench. (It's all going to go in a 1U box in the
Neil Schroeder wrote:
Graham make sure you read up on dtb and fdt. Many if not most distros
don't
have what you might call a default.
I have done several device tree overlays on the BBB, so I think I can
usually get the
I/O lines and pin-mux to do what I want them to do. It was a total pain
Le 10 déc. 2014 à 19:55, Laszlo Hanyecz las...@heliacal.net a écrit :
Time-nuts,
Is it a bad idea to have more than one PPS source on a single machine? Would
this cause additional jitter when trying to compare the timestamps on two
sources? I understand that USB can't deliver a real
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
The issue for me is that if it couldn't get a good timing solution, why did if
fail quietly? I would expect it to at least go into holdover and turn on an
alarm or something. It was giving me fits at least 4 times a day, so I should
have some idea whether using a different port on the
Hi
Have you dumped the log file from the KS and seen what it says about the
tracking?
Bob
On Dec 10, 2014, at 2:13 PM, Bob Stewart b...@evoria.net wrote:
I've been uncomfortable with this KS since I got it; even having to return
the REF-0 unit for comms problems. Now that I have the
Hi
If you are running multiple units on a splitter, the “antenna sense” circuit in
any of these GPSDO’s can get picky. I’ve had situations where (for what ever
reason) a “light” DC load only failed on rare occasions. My guess is that the
current is monitored with a low precision DAC and the
So just some comments based on personal experience with the raspi. Your
experience may vary.
I think it depends if they are phase aligned or offset. If the interrupts are
occurring at the same time, I would anticipate increased jitter. If they are
offset I would not expect any negative
On Wed, Dec 10, 2014 at 9:58 PM, Brian Lloyd br...@lloyd.aero wrote:
Well, I am hoping to get to the point where the path to using the BBB as an
NTP server using the PRU for more precise timing, and using the LTE-lite to
provide the 1pps and time data. Of course, the LTE-lite can also provide
I don't think so - should just work
Did you already have ntpd running when you attached? And do you have the
full PPS module stack including ldisc?
It works on every platform I got. :-)
As to better than Internet time - I cannot get it closer than 2 or 3 ms. I
have MANY internet time sources
Hi Bob,
I tried looking at the log in the Z38XX program (in wine), and I just get a
blank. So, I brought up Satstat in a Virtualbox and there's nothing of any
consequence. There are the entries today when I started moving antenna ports
around, and then nothing back till 12/5 when I was trying
[Context is second PPS input.]
brayn...@gmail.com said:
I think it depends if they are phase aligned or offset. If the interrupts
are occurring at the same time, I would anticipate increased jitter. If they
are offset I would not expect any negative impact.
A simple way to demonstrate the
Bob wrote:
No, I do not have a 360 degree view of the sky * * * I have
the southerly 180 degrees from about 20 degrees elevation and up. I
bought this KS as an example reference for my homegrown. It may be
that it's just not up to the job under my conditions.
This will affect the
On Wed, Dec 10, 2014 at 4:58 PM, Brian Lloyd br...@lloyd.aero wrote:
Well, I am hoping to get to the point where the path to using the BBB as an
NTP server using the PRU for more precise timing
Using a PRU seems like overkill if all you want from the BBB is NTP. The
standard pps-gpio should
Well, it just headed south again. I don't see anything on the status screen,
captured below, but that may just be me. I also captured the normal PPS TI
EFC screen. (Both from Z38XX.exe) The EFC screen just looks ugly to me. You
can see where it went south over on the right with the sudden
Sorry about that. Hopefully this separates the two links. I'm going to have
to ask John what's causing this.
http://evoria.net/AE6RV/KS/KS.Screen.png
break
http://evoria.net/AE6RV/KS/KS.Status.png
From: Bob Stewart b...@evoria.net
To: Discussion of precise time and frequency
http://evoria.net/AE6RV/KS/KS.Screen.pnghttp://evoria.net/AE6RV/KS/KS.Status.png
works better as
http://evoria.net/AE6RV/KS/KS.Screen.png
http://evoria.net/AE6RV/KS/KS.Status.png
-Arthur
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To
On 12/10/2014 12:57 AM, Richard (Rick) Karlquist wrote:
On 12/9/2014 3:02 PM, Bob Camp wrote:
Here's an overnight ADEV plot against the new Cs of where we are in
the project. Red is ADEV. Green is the TIC. Blue is the output of the
GPSDO to Channel A and the Cs to Channel B of my 5335A
Bob wrote:
The issue for me is that if it couldn't get a good timing solution,
why did if fail quietly? I would expect it to at least go into
holdover and turn on an alarm or something. It was giving me fits
at least 4 times a day, so I should have some idea whether using a
different port
What does the temperature controller do that degrades the ADEV?
Can anything be done to modify it to improve the performance?
On the lightweight Rb's they feed the correction into a DDS. The DDS
steps are big enough to show up above the ADEV. You get a hump in
the ADEV as a result. The solution
Hi
I suspect that if you look closely at the board in the unit, it’s got water
stains on it ….
Bob
On Dec 10, 2014, at 5:25 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
drkir...@kirkbymicrowave.co.uk wrote:
I bought an 85053A receiver from the eBay seller yixunhk. This is
supposed to be
Hi
On Dec 10, 2014, at 8:02 PM, Mike Monett timen...@binsamp.e4ward.com wrote:
What does the temperature controller do that degrades the ADEV?
Can anything be done to modify it to improve the performance?
On the lightweight Rb's they feed the correction into a DDS. The DDS
steps are big
Bob,
On 12/11/2014 02:25 AM, Bob Camp wrote:
Hi
On Dec 10, 2014, at 8:02 PM, Mike Monett timen...@binsamp.e4ward.com wrote:
OK, so I figure out how to do this. How do I tell if this is making the
gpsdo more accurate? In other words, how do I get the ADEV without having
an H-Maser?
You
Hi
On Dec 10, 2014, at 6:24 PM, Bob Stewart b...@evoria.net wrote:
Hi Bob,
I tried looking at the log in the Z38XX program (in wine), and I just get a
blank.
That suggests that Z38xx (at least under wine) has yet another bug when running
on the KS boxes. That’s not a big surprise. The
Hi Bob,
I'm starting to think it's something as mundane as a cold solder joint or a bad
cap. Though neither of those ideas explains why it's usually so periodic.
Maybe it is the antenna. I have an idea about how to get something up on the
roof without anyone complaining. I'll give it
Quoting Paul tic-...@bodosom.net:
Using a PRU seems like overkill if all you want from the BBB is NTP. The
standard pps-gpio should move the system clock precision below
system/network jitter (.5 to 1 microsecond). The next step is using a
timer (TIMER4) which should get you into .1
Dan:
When you forced/locked the CPU frequency at 1 GHz, did you by any chance
measure what it did to the CPU case/package temperature? Or current drain?
I note that you used BBB pin P8.7 for PPS input. That allowed you to use
it for either
pps-gpio or TIMER4 pps-gmtimer, by just changing the
Hi
On Dec 10, 2014, at 8:32 PM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
Bob,
On 12/11/2014 02:25 AM, Bob Camp wrote:
Hi
On Dec 10, 2014, at 8:02 PM, Mike Monett timen...@binsamp.e4ward.com
wrote:
OK, so I figure out how to do this. How do I tell if this is making the
It would appear the best approach is to simply start reading the
posts at the beginning and save the interesting ones.
There are lots of interesting threads on Time Nuts ...
Yes. It is very easy to get distracted.
First step is to be able to extract timing data from individual
sat's. Not
Those sub 1 u-second numbers are very good. They argue for using the BBB
as an NTP server but I wonder if it really is the best. I think the
numbers that matter are measures of the close on the computers who use your
BBB as a server. In other words the goal is to synchronize a set of
Hello
Try to run ntpd with realtime priority (options '-N' or '-P priority').
Your an hourly jobs can be executed several slower but it may improve
the time synchronization.
2014-12-09 23:45 GMT+04:00, Frister fris...@gmx.net:
Hi David,
Yes, You mean the hourly dips? That is caused by the the
On Wed, Dec 10, 2014 at 10:21 PM, Michael Tatarinov kuk...@gmail.com
wrote:
Hello
Try to run ntpd with realtime priority (options '-N' or '-P priority').
Your an hourly jobs can be executed several slower but it may improve
the time synchronization.
And given the price, why try to run
On Wed, Dec 10, 2014 at 10:15 PM, Chris Albertson albertson.ch...@gmail.com
wrote:
Those sub 1 u-second numbers are very good. They argue for using the BBB
as an NTP server but I wonder if it really is the best. I think the
numbers that matter are measures of the close on the computers who
Le 11 déc. 2014 à 05:47, Brian Lloyd br...@lloyd.aero a écrit :
On Wed, Dec 10, 2014 at 10:15 PM, Chris Albertson albertson.ch...@gmail.com
wrote:
Those sub 1 u-second numbers are very good. They argue for using the BBB
as an NTP server but I wonder if it really is the best. I think
2014-12-11 8:48 GMT+04:00, Brian Lloyd br...@lloyd.aero:
On Wed, Dec 10, 2014 at 10:21 PM, Michael Tatarinov kuk...@gmail.com
wrote:
Hello
Try to run ntpd with realtime priority (options '-N' or '-P priority').
Your an hourly jobs can be executed several slower but it may improve
the time
With the permission of TVB and JRA, here's the short version.
Network Time Foundation is now old enough (3 years) to qualify to be
listed with the Combined Federal Campaign, and we'd love to be listed
there. As I understand it, there's another qualification hurdle - we
need to have at least
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