Re: [time-nuts] Suggest time-and-tech related locations in Switzerland

[Jean-Louis Oneto]

There is a Laser Ranging station in Zimmerwald which is related to 
METAS. They measure distance of artificial satellites down to few 
millimeters by fly time of sub-nanosecond laser pulses, so they have 
very accurate time-interval measurement systems.


There is also a nice Museum d'horlogerie in Le Locle, near Neuchatel :

https://en.wikipedia.org/wiki/Le_Locle

Best regards,

Jean-Louis


On 15/03/2018 12:22, Pete Stephenson wrote:

Also worth mentioning is the Swiss standards organization, METAS, in Bern. 
Their time and frequency group has a few atomic clocks, a maser, and some other 
shiny things they use for realizing UTC(CH), as well as a few research projects 
related to the subject. While not formally open to the public, they do tours on 
request.

On Thu, Mar 15, 2018, at 9:18 AM, Bernd Neubig wrote:

Hi Dave,
the center of the Swiss watch & crystal industry is the small town of
Grenchen, location of many famous watch makers including the SMH group
which includes Microcrystal, previously also Oscilloquartz, and the
following wathc brands:
  Prestige and Luxury:
 Breguet (CH)
 Blancpain (CH)
 Glashütte Original (D)
 Jaquet Droz (CH)
 Léon Hatot (CH)
 Harry Winston (USA)
 Omega (CH)
 Upper price segment:
 Longines (CH)
 Rado (CH)
 Union Glashütte (D)
 Middle price segment:
 Tissot (CH)
 Calvin Klein (CH)
 Balmain (CH)
 Certina (CH)
 Mido (CH)
 Hamilton (CH)
 Base segment:
 Swatch (CH)
 Flik Flak (CH)
 Private Label:
 Endura (CH)

A few km away is Neuchatel (Neuenburg), a center of time and frequency
companies.
I am not familiar with museums in that area, but I am sure there are
some. I think someone else on the list will have more details.
The whole area is the so-called "Swiss Jura".
The area of time & frequency companies and institutes extends into
France up to Besancon.
Neuchatel and Besancon are the locations where the EFTF (European Time
and Frequency Forum) started and is taking place in one of both every
two years.

Best regards
Bernd
DK1AG



-Ursprüngliche Nachricht-
Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von David Witten
Gesendet: Dienstag, 13. März 2018 22:59
An: time-nuts@febo.com
Betreff: [time-nuts] Suggest time-and-tech related locations in Switzerland

My wife and I are traveling to Switzerland for the last week in May.  I
have never been there before.

I would appreciate suggestions for time / tech sites of interest to visit.

We plan to fly to Zurich, but travel immediately to Geneva and then work
our way back to Zurich by train, stopping (at least) in Bern.

I would like to see what I can at CERN, I plan to attend the Ham meeting
in in Friedrichshafen June 1 - 3.

Dave
___
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




--
Jean-Louis Oneto
email: jl.on...@free.fr

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Need a Watch Recommendation

[Jean-Louis Oneto]

The half dial in 02:00 with "S M T W T F S" looks like a weekday indicator to 
me.
Best regards,
Jean-Louis 




Envoyé depuis mon appareil mobile Samsung.

 Message d'origine 
De : Jeremy Nichols  
Date :14/03/2018  22:40  (GMT+01:00) 
A : Discussion of precise time and frequency measurement  
Objet : Re: [time-nuts] Need a Watch Recommendation 

Nice but lacks "day” feature (has “date”). I don’t normally care whether
it’s the 22nd or the 23rd but it’s nice to know whether it’s Tuesday or
Wednesday. YMMV, of course.

Jeremy

On Wed, Mar 14, 2018 at 1:57 PM Achim Vollhardt 
wrote:

> Dear Don and all,
> no mentioning of the Seiko Astron GPS Solar?
>
> http://www.seiko-astron.com/
>
> 73s
> Achim DH2VA
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
-- 
Sent from my iPad 4.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Oscilloquartz 8600-3 Disassembly pictures...

[Jean-Louis Oneto]

Hello,

Once upon a time, I uploaded to Didier Juges' site the manual (English & 
French) for my Oscilloquartz 2200 which include a OCXO 8601 :


http://www.ko4bb.com/getsimple/index.php?id=download=02_GPS_Timing/Oscilloquartz_SA_2200_2205_Quartz_Frequency_Standard_Type_2200_and_Clock__Option_2205_Operator_Manual.pdf

Even if the internals of the 8601 are not detailled, I hope it will be 
of any help.


Best regards from France,
Jean-Louis

On 14/12/2017 07:02, Ulf Kylenfall via time-nuts wrote:
  
Tried to mail the pictures to Magnus. The mail bounced back.

Ole Petter Ronningen was kind to also offer space for themand they can be found 
at:

www (dot) efos3 (dot) com/osa8600-3

73
Ulf Kylenfall - SM6GXV
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
Jean-Louis Oneto
email: jl.on...@free.fr

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] ublox NEO-M8T improved by insulated chamber?

[Jean-Louis Oneto]

Hi Ole,
I think that the long term undulation are caused by a (small) error in geodetic 
position of the antenna. The period should be a sidereal day (23:56...)
Have a good day, 
Jean-Louis 



Envoyé depuis mon appareil mobile Samsung.

 Message d'origine 
De : Ole Petter Ronningen  
Date :07/11/2017  15:15  (GMT+01:00) 
A : Discussion of precise time and frequency measurement  
Objet : Re: [time-nuts] ublox NEO-M8T improved by insulated chamber? 

Hi all

Attached is a 24 hour plot of PPS out from a UBlox 6T against a hydrogen
maser. From 00:00 the bare receiver board was inside a polystyrene box
where it has soaked for many months, at 16:00 I removed the box exposing
the board to the airflow in the room, including AC. The box was left off
for the rest of the day.

The green trace is temperature in the lab. The "long term undulation" in
phase is normal, although I do not know the precise cause (multipath or
something else. I am reasonably sure it is not related to temperature in
the lab.

[image: Inline image 1])

Ole

On Sat, Nov 4, 2017 at 6:06 PM, Denny Page  wrote:

> [I hate finding unsent email in my folder :-]
>
> Others may disagree, but I doubt that the type of small temperature
> variation you are referring to has any meaningful effect on tracking. While
> the datasheet for the M8T says that there can be "significant impact" to
> the specifications at “extreme operating temperatures,” it gives the
> operating temperature as -40 to +85 C. Simply said, if you can stand to be
> in the same room/space with it, I think you are fine.
>
> Of much greater interest would be the antenna and it’s placement. I’m
> afraid I can’t specifically recommend a “good” antenna, but perhaps others
> on the list can. For my EVK-M8T, I’m using the antenna that came with the
> kit and it works very well. I haven’t tested other antennas with the M8T at
> this time, but I do have a number of other devices with antennas that work
> well. I also have a few antennas that work poorly with all the devices,
> including the ones with which they came. Unfortunately pretty much all of
> them lack sufficient identification markings to identify manufacture/model
> info.
>
> Regarding placement, I’ve found that in a restricted area even a few
> inches can have a significant impact on the average number of satellites
> and signal level. In my case, it’s associated with the single building
> structure, but it sounds your case is even more restrictive. Although it
> can be a very lengthy process, performing antenna surveys may help improve
> your situation. For each location, you need to monitor the number of
> satellites and signal level for 24 hours or more before determining the
> relative merit of that location. Repeat… and repeat.. and repeat.
> Determining the very best location for the antenna will likely require as
> many antenna surveys as you have patience for. :)
>
> Hope this helps.
>
> Denny
>
>
> > On Nov 02, 2017, at 18:54, MLewis  wrote:
> >
> > Earlier this week, I put the breakout board with my NEO-M8T into an
> aluminum can. The can is split into a lower half and an upper half. The
> lower half was insulated on its sides internally, but open to the upper
> half, which wasn't insulated. The lower area contains the NEO-M8T on its
> breakout board and its matching com breakout board.
> >
> > In the unusual skyview/RF environment described below:
> > - LH was typically showing two or three green sats, with a min of none
> and a max of five for very brief periods.
> > - The average dBc of the green sats was 22 dBc, with a max of 29 dBc.
> > - Two screen shots of LH from this time period show an Accu of 12 ns and
> 33 ns.
> >
> > This morning, I insulated the inside of the upper half of the can, and
> added insulation to seal the top of the lower area into a chamber that
> contained the GPS module board & its com board. Since then, its run for
> around ten hours, same weather as yesterday except more rain, ambient room
> temperature wasn't measured but is definitely warmer. Since after around an
> hour of running:
> > - LH has been showing between two and eight green sats, typically three
> to five:
> > - Their average dBc is 30 dBc, with a max of 37 dBc.
> > - LH Accu is showing as 6 ns.
> >
> > I have no idea what the temperature is inside the chamber.
> >
> > As I write this, LH is showing three green sats, at 33, 34 and 35 dBc.
> >
> > I expected a more stable internal TCXO in the GPS module, but I didn't
> expect stronger signals. Although perhaps I should have, as the block
> diagram for the NEO-M8T does show its TCXO pointing at a "Fractional N
> Synthesizer" inside the UBX-M8030's "RF Block". It also shows a RTC Crystal
> for a RTC inside the "Digital Block".
> >
> > Is this coincidence or can reception improve with:
> > - a higher temperature module?
> > - a more stable module temperature?
> >
> > I'm tempted to 

Re: [time-nuts] Oscilloquartz 2200 Clock / B-5400 Oscillator

[Jean-Louis Oneto]

Hello,
I have just uploaded to Didier Juges website the manual for the 
Oscilloquartz 2200 with clock option 2205, complete with schematics.

Best regards,
Jean-Louis


On 21/01/2015 13:43, Tom Van Baak wrote:

Hi Adrian,

I have a working Oscilloquartz B-5400. A copy of the data sheet is at:
 http://leapsecond.com/museum/osa5400/1982-OSA-B-5400-ds.pdf
but I do not have a manual for it.

Did you happen to take some photos when you did the repair? I'd like to see the 
inside, but since mine is working I'm hesitant to open it and take a close 
look. Also, what is your measurement and reference, where you can measure to 
the low -13's?

Thanks,
/tvb

- Original Message -
From: Adrian rfn...@arcor.de
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Tuesday, January 20, 2015 2:32 PM
Subject: [time-nuts] Oscilloquartz 2200 Clock / B-5400 Oscillator



I ran into a nice Oscilloquartz 2200 digital clock / precision crystal
oscillator from the early 80's that is in need of some care.

Please let me know if you have any manuals / data sheets / catalog pages
or other information to share.

At the moment I'm working on the faulty power supply. Any schematics,
also from a 2210 that appears to have the same PS would be very helpful.

The 2200 houses a B-5400 high performance oscillator that has been
reported here:
http://tf.boulder.nist.gov/general/pdf/26.pdf

Any other information, data sheets etc. would be nice.

I tested the oscillator on an external power supply. After about a day
of continous operation it was obviously still running in, but first ADEV
mesurements pointed into the low E-13's.

Unfortunetely, it stopped then drawing current, so I had to take it
apart. Out came a nice dewar-packaged cylindrical oscillator housing.
When I pulled it out, the heater windings unwound like an untied spring.
That will be a challenge to get nicely rewound but should be possible.
Any advice what glue to use for fixing them permanently on the housing
are welcome.
The culprit was a hermetic tantalum cap in the 10V reference circuit.

Adrian
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
Jean-Louis Oneto
email: jl.on...@free.fr

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Documents relevant to SR620

[Jean-Louis Oneto]

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 around 5.5 MB.
Let me know if you are interested, and how I can send it to you. 
Regards, 


Jean-Louis Oneto

Envoyé depuis un mobile Samsung 

 Message d'origine 
De : Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk 
Date :10/12/2014  09:31  (GMT+01:00) 
A : Discussion of precise time and frequency measurement time-nuts@febo.com 
Objet : [time-nuts] Documents relevant to SR620 

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 would be worthwhile putting all relevant documentation into
one large PDF file and getting that printed, so everything is in one place.
The following seem revant

* SR620 user manual
* SC10 OCXO manual as I believe that is the OCXO they use in the high
stability timebase
* SR625 Rb timebase / 2 GHz frequency extender.
* PRS10 Rb oscillator as that used in the SR625
* I think I read the SR620 service manual is available too, although I
don't know where from.
* Some notes on aligning the SR620 from time-nuts.

Is there anything else relevant?

Dave.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Documents relevant to SR620

[Jean-Louis Oneto]

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:

http://168.144.151.127/manuals/69.143.130.128/1_Upload_Instructions.php

Best regards,

Charles



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



--
Jean-Louis Oneto
email: jl.on...@free.fr

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] 10MHz LTE-Lite

[Jean-Louis Oneto]

Hello Said and T-nuts,
About the 20 MHz LTE-Lite, do you have news for a new batch? (unfortunately, I 
missed the first one...)
Bye,
Jean-Louis

- Mail original -
De: S. Jackson via time-nuts time-nuts@febo.com
À: time-nuts@febo.com
Envoyé: Jeudi 20 Novembre 2014 20:32:36
Objet: [time-nuts] 10MHz LTE-Lite

Hello everyone,
 
after what must have been the longest thread in T-nuts history its  almost 
all quiet today. I am going to take advantage of that and  announce some 
good news:
 
Its a miracle: the 10MHz DIP-14 TCXOs for the LTE-Lite came in weeks  ahead 
of schedule from the factory! And they work very well.
 
We will thus be shipping out the 10MHz LTE-Lite eval boards in the  next 
couple of working days. There are still a number left for sale on Ebay  
(search for LTE Lite GPSDO), so if you were hesitant to get one due to the  
long 
lead-time, then now is your chance.
 
Also, after being in time nuts hands for almost a week I am surprised  
there are very few mails, questions, or comments about the 20MHz boards,  and 
we 
have received almost no feedback on Ebay :( I hope that is a good  sign.
 
Bye,
Said



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] RE : Re: GPS-III

[Jean-Louis Oneto]

Hello, 
While not really monolithic, I have found L1/L2 receivers (mostly for 
navigation, but also in timing flavor) rather well integrated, especially from 
Novatel and Javad. Sadly, their websites don't mention prices. 
Regards, 


Jean-Louis Oneto

Envoyé depuis un mobile Samsung 

 Message d'origine 
De : Attila Kinali att...@kinali.ch 
Date :25/07/2014  00:31  (GMT+01:00) 
A : Discussion of precise time and frequency measurement time-nuts@febo.com 
Objet : Re: [time-nuts] GPS-III 

On Thu, 24 Jul 2014 10:30:07 -0700
Michael Perrett mkperr...@gmail.com wrote:

 The government is in the process of fielding three new signals designed for
 civilian use: L2C, L5, and L1C. The legacy civil signal, called L1 C/A or
 C/A at L1, will continue broadcasting in the future, for a total of four
 civil GPS signals. Users must upgrade their equipment to benefit from the
 new signals.

Side note: L1C and L5 will only be available with Block III satellites.
(ie. not before 201x, and even then only one or two satellites)
L2C is available with Block IIM and IIF (13 satellites)


 These new signals (will) provide many advantages as seen by the civilian
 user, one of the most obvious is the ability to make real time IONO
 corrections on civilian receivers (currently restricted to P Code
 receivers). 

L1/L2 receivers already exist for civilan use and have been for
some time. The P(Y) code does not need to be decoded for tracking
the signal. This is known as codless tracking.

Attila Kinali

-- 
I pity people who can't find laughter or at least some bit of amusement in
the little doings of the day. I believe I could find something ridiculous
even in the saddest moment, if necessary. It has nothing to do with being
superficial. It's a matter of joy in life.
-- Sophie Scholl
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] RE : GPS III

[Jean-Louis Oneto]

The uBlox Max-7Q seems to be able to merge GPS and GLONASS for navigation, but 
the manual says explicitly that it must be avoided for timing, the delay of the 
PPS from GLONASS being not calibrated (plus various problems related to 
timescales).
Regards, 


Jean-Louis Oneto

Envoyé depuis un mobile Samsung 

 Message d'origine 
De : Mark Sims hol...@hotmail.com 
Date :25/07/2014  01:15  (GMT+01:00) 
A : time-nuts@febo.com 
Objet : [time-nuts] GPS III 

I have purchased about a dozen of these receivers (mostly the RS-232 version 
for $1 more).   Reyax ships very fast.  I get them in about 1 week.
They work well,  and are based upon the Ublox MAX-7C.  They output independent 
GPS and Glonass NMEA messages and don't appear to merge the two systems in 
their navigation solutions.  I have not done any testing of the 1PPS signal 
(which is brought out to the connector).
--
On eBay the RNY25A1 receiver module sells for $15      
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] RE : Re: FASTRAX GPS

[Jean-Louis Oneto]

Hello,
AFAIK, the differential variant of RS-232 is RS-485. I'm not sure about the 
levels. 
Best regards, 


Jean-Louis Oneto

Envoyé depuis un mobile Samsung 

 Message d'origine 
De : Chris Albertson albertson.ch...@gmail.com 
Date :02/07/2014  21:36  (GMT+01:00) 
A : Discussion of precise time and frequency measurement time-nuts@febo.com 
Objet : Re: [time-nuts] FASTRAX GPS 

I tried using it as pairs but you really can't.  You have Tx, Rx and
the PPS all sharing one ground return and the ground is not even a
current return because each end is connected tho the building ground
system.   So you can TRY to use pairs like I did but it remains
unbalanced.

Yes you can make it work by using balanced pairs but then it is no
longer RS232 and need driver/receiver chips and level conversion at
each end.  Balanced lines work very well.

The problem is that the RS232 receiver looks only at the voltage on
one of the wires in the pair relative to ground and not the difference
between the wires in the pair.

On Wed, Jul 2, 2014 at 10:45 AM, Hal Murray hmur...@megapathdsl.net wrote:

 albertson.ch...@gmail.com said:
 I tried using a long serial cable.  Just because I had some 100 feet of
 cat-5 wire already installed.  It did not work reliably I was using a MAX232
 chip as a driver.

 Were you using it as 8 separate wires or 4 pairs?

 I'd expect RS-232 to work over 100 ft of Cat-5 if you used half of each pair
 as a ground.  (That's at 9600 baud.)

 --
 These are my opinions.  I hate spam.



 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.



-- 

Chris Albertson
Redondo Beach, California
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Beginner question - unexpected possible jitter in 1 PPS output of Motorola ONCORE UT+ module

[Jean-Louis Oneto]

Hello,
The UT_Eng_Notes file I have (for the UT, not the UT+) specify:

   1PPS Signal Description
   . 0 to 5 V pulse
   . Pulse accuracy:
   - Normal mode:  130 ns (one sigma) with SA on
   - Position-hold mode:  50 ns (one sigma) with SA on
   . Rise time from 0 to 5 V is approximately 20 to 30 ns with a
   recommended maximum line loading
   of 50 pF
   . 1PPS time mark is synchronous with rising edge of pulse
   . Pulse width is approximately 200 ms (*± 1 ms*), i.e. the falling
   edge occurs approximately 200 ms
   after the rising edge
   . Pulse can be advanced to account for antenna cable delay using the
   1PPS Cable Delay command
   . Pulse location can be delayed using the 1PPS Offset command to
   position the pulse at any desired
   time within the one second window


So if your divider is clocked on the falling edge of the 1PPS, you can 
expect a 1 ms jitter...

Regards,
Jean-Louis

On 31/05/2014 22:02, David Feldman wrote:

Picked this project back up this afternoon after couple of weeks, narrowed the 
problem down but not solved.

Refresh: My ONCORE UT+ module appears to have very extreme jitter (on on order 
of 100 uSec, not nSec random variation between leading edges of successive 
pulses) in the 1 PPS output. I am using the 1 Hz signal, divided to 0.05 Hz at 
50% duty cycle (10 seconds high, 10 seconds low), to gate my frequency 
counter's reference oscillator back into the same counter running in 
pulse-count mode so I can adjust the OCXO bias on the counter for calibration. 
10 seconds count-up, followed by 10 seconds idle where I can record the 
measurement, reset the counter, and adjust the OCXO bias.

I've now built a simple 1 Hz pulse generator using a 32768 Hz crystal and 
CD4060 divider. Using that signal instead of the ONCORE UT+, my counter is 
behaving as expected (that is, each count-up session results in the same 
result, +/- a few counts as would be expected with a simple 1 PPS signal.) This 
tells me the gating circuit and interface to the counter's reference output and 
count input are probably OK.

When using the ONCORE UT+, the counts vary by 1 or more from one 10-second 
capture to the next (each count-up period would total 130,000,000 counts if the 
ONCORE UT+ was working properly and the reference OCXO was properly adjusted.)

I am not yet able to determine why the UT+ 1 PPS signal has such severe jitter. 
TAC software tells me 7-8 satellites acquired/tracked once cold start has 
completed (10-15 minutes.) Is there something I'm missing about UT+ care and 
feeding? There are no RF or switching digital signals close to the UT+ module 
(the gating circuit is a couple of inches away, both mounted on the same perf 
board, with common ground and power supply connections.

Now that I've ruled out the counter/gating circuit interface, I begin to 
suspect the UT+ but don't really know what to expect in terms of 
normal/abnormal operation.

Any advice at this point?

Thanks,

Dave

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] RE : Re: Weather/units question for European members

[Jean-Louis Oneto]

FYI,
In France, we also use SI units, hPa for atmospheric pressure, but m/s in 
technical reports (marine, aviation. ..) and km/h in consumer products aka 
weather forecasts on TV...
HTH
Best regards, 


Jean-Louis Oneto

Envoyé depuis un mobile Samsung 



 Message d'origine 
De : Poul-Henning Kamp p...@phk.freebsd.dk 
Date :24/05/2014  08:45  (GMT+01:00) 
A : Discussion of precise time and frequency measurement 
time-nuts@febo.com,Mark Sims hol...@hotmail.com 
Objet : Re: [time-nuts] Weather/units question for European members 

In message blu170-w517a3e7d32e32be4c3d3a4ce...@phx.gbl, Mark Sims writes

I am building a weather sensor that includes a ultrasonic anemometer

Now the question...  I would like it to be able to output data in
imperial or metric units.  In what units is the typical wind speed
reported  (meters/sec,  km/hour, ?).   Also air pressure
(millibars/hectopascals/pascals/?).

Whatever you do, use SI units internally and make it an option for the
user to get those.  Convert from SI to whatever the user wants in their
local cultural geograpy.

PS: In Denmark we use the SI units:  Meter per second and hectopascal.

See for instance:   

    http://www.dmi.dk/vejr/til-lands/regionaludsigten/vssjaelland/


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Language -- The eternal barrier

[Jean-Louis Oneto]

about $1/dB, it's a bargain :-)
Reagrds,
Jean-Louis

On 01/07/2013 22:56, Michael Blazer wrote:
Obviously we've been doing it wrong all these years.  Here's 29 dB 
Noise Reduction 
http://www.basspro.com/RedHead-RTX-Folding-Earmuffs/product/94964/ 
for only $29.99.


Mike



On 7/1/2013 3:45 AM, gandal...@aol.com wrote:
  Having recently bought a couple of MV89As I found listed on 
AmazonUK I
received a feedback request a couple of days ago from the seller and 
took the

opportunity to point out that whilst one was fine the other was much
noisier than the first, and also in comparison with others I'd 
previously  bought

elsewhere.
  The seller has very kindly provided a solution to my problem..
  ---
Dear Nigel,

Thank you for your reply.

We are very sorry  for the issue. We suggest that you could wear 
earphone

to reduce the noise when you use the oscillators.

Sorry for  all the inconvenience again.


Your understanding will be highly  appreciated in advance.
--
  Off topic I know, so apologies for that, but thought others might 
enjoy it

too:-)
  Regards
  Nigel
GM8PZR
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - 2130 Route de l'Observatoire
Caussols 06460 Saint-Vallier de Thiey - France
email: jean-louis.on...@obs-azur.fr
phone: (+33)[0]4.93.40.54.25

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Measuring speed of light or reproducing a metre

[Jean-Louis Oneto]

Hi list !
Searching for newton jupiter moons speed of light I found this very 
nice page:

http://galileoandeinstein.physics.virginia.edu/lectures/spedlite.html
A lot of the early measurements of c are described, with the accuracies 
reached.
But most of the older methods are rather difficult to demonstrate to 
kids, as they need long series of observations...

Best regards,
Jean-Louis

On 24/06/2013 21:26, Chris Albertson wrote:

On Mon, Jun 24, 2013 at 1:55 PM, Jim Lux jim...@earthlink.net wrote:


On 6/24/13 10:08 AM, Chris Albertson wrote:


Isn't that the Fizeau technique, which antedates Michelson's?

  Michelson got the precision good enough that it finally put the question
to rest.  We used a miles-long baseline of very clear and still air.


You need to know the rotation rate of the toothed cog or rotating mirror,
don't you?


I think you have to count the number of rotations over a larger time
interval.  And at the same time make sure the spin rate is constant.  They
used a large hexagon with mirrors on all the faces and spun it up using
some kind of clock work.

You can see if the wheel is speeding up or slowing down because the slit of
returned light should have constant offset.  So the experiment has a
built-in check on the rate remaining constant.  And then you count the
turns over some long interval using gears or what not.   They built a shed
to house this thing on the side or Mt. Wilson.  All that is left no is the
concrete foundation and concrete pier for the instrument.  This was a not
small scale lab experiment.  It must have been well funded to be able to
pour tons of concrete at a remote location like that.

I think the harder part is knowing what the long baseline is.  How to
measure 5 miles distance with the required accuracy in 1900?  Yes they have
survey equipment back them put how good was it?   I I don't think they
needed to know the exact length, just that it was a long constant length.
  They were only trying to show the C was not constant.  But of course the
experiment failed


--
Jean-Louis Oneto
OCA GeoAzur - 2130 Route de l'Observatoire
Caussols 06460 Saint-Vallier de Thiey - France
email: jean-louis.on...@obs-azur.fr
phone: (+33)[0]4.93.40.54.25

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Oscillator coupling

[Jean-Louis Oneto]

Hi,
A long time ago (~1955), when mechanical watches were the only sort on 
the market, and pocket watch (onions) were not only a curiosity, I 
remember seeing in watchmaker showcase several of them suspended by 
their ring on little hooks, and the coupling was enough to make the 
oscillate in synchronism.

Regards,
Jean-Louis

Le 05/10/2012 14:58, Marco IK1ODO -2 a écrit :

Very nice experiment on oscillator coupling:
http://blogs.discovermagazine.com/cosmicvariance/2012/10/01/you-are-getting-sleeepy/ 



Quite time-nuts style, I would say.

Marco IK1ODO


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Low power timekeeping

[Jean-Louis Oneto]

Keeping a GPSDWW buried in a deep hole in ground make me feel like a 
graveyard, since the wrist should be buried as well...

I'm not sure that even time-nuts need precise time in after-life?
(Sorry, I didn't resist :-) )
Jean-Louis Oneto

Le 26/09/2012 04:48, Chris Albertson a écrit :

On Tue, Sep 25, 2012 at 7:19 PM, Hal Murray hmur...@megapathdsl.net wrote:


How good a clock could you get at much lower power?  I guess I'm looking
for something (logarithmically) between a watch and a GPSDO.


The trick to ultra-low power, I think, is to not run the GPS receiver full
time.  If you literally want something between a wrist watch and a GPSDO
then build a GPS disciplined wrist watch GPSDWW.  Let the watch run open
loop until  say an hour then turn on the GPS for a few seconds, adjust the
watch then power off the GPS.   Likely you'd use something better then a
watch crystal but almost as low power

Rather then spend a lot of energy with a heater and oven to stabilize the
temperature I think you can dig a deep hole in the ground like a well and
burry the oscillator and have an ultra stabile temperature for years.

Chris Albertson
Redondo Beach, California
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic - 06130 Grasse - France
email: jean-louis.on...@obs-azur.fr
phone: (+33)[0]4.93.40.53.80


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Phase modulation detection/NIST plan.. PS

[Jean-Louis Oneto]

I just hope it didn't died on the last leapsecond...?

On 16/07/2012 22:50, J. Forster wrote:

PS:

30 odd years ago, I bought a toaster for about $20 that worked fine and
made good toast until recently. It only failed because a piece of bread
got jammed and was impossible to clean.

So, I bought a new toaster, for about the same price. It didn't last 30
weeks.

In my view, this is NOT progress.

I detest having to resolve supposedly solved problems.

YMMV,

-John









Just because I like Brie, doesn't mean I like French Bread or wine.

I am interested in Standards of Time Interval for engineering purposes.

I havn't looked at my oven clock in probably 25 years. I presume it's
accurate twice a day or somewhere on earth, but I couldn't care less.

IMO, adding a clock to an oven, dishwasher, refrigerator, toaster oven,
coffee maker, etc. is simply another useless feature. Bling to catch the
eye of the clueless shopper.

I'd much rather the maker spent the $0.50 a digital clock costs on
meaningful quality improvements in those features that actually matter.

YMMV,

-John






HI

A died in the wool Time Nut who doesn't care what time it is - what's
the
world coming to 

Bob

On Jul 16, 2012, at 9:34 AM, J. Forster wrote:


More importantly, how many things don't really need a clock to begin
with! :)

ABSOLUTELY!

If you turn on the coffee maker when you walk int the kitchen, it'll be
done by the time you fix breakfast. And so on...

A clock on almost everything is totally superfluous, IMO. Things that
do
need to be externally synchronized, like video recorder, can bette4r
use
the program time.


Every piece of equipment in our house shows a different time. I
wouldn't complain if they all automatically adjusted. My current
solution is to just stop looking at the clocks, and it's amazing how
much easier life gets if you just stop worrying about things! :)

Finally, a voice of common sense!


Dan

-John

=


On 7/14/2012 10:50 AM, time-nuts-requ...@febo.com wrote:

Hi

I think the answer to how many places would it be used is to simply
count the number of things that have the wrong time on them each time
the power burps. There are maybe a dozen gizmos like that in this
room
(yes I'm in the kitchen).

Bob



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.





___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.





___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.





___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic
06130 Grasse - France
e-mail: jean-louis.on...@obs-azur.fr


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Leap second coming...

[Jean-Louis Oneto]

Well, it would be funny to add 1/24th of a second at 00:00 TL in each of 
the timezones, but I'm afraid that would tear apart the Earth rotation ?



Le 29/06/2012 18:06, Bill Powell a écrit :

I'm guessing it's just added at one instant - to UTC.

Regards,
Bill


On Jun 29, 2012, at 1:55 PM, Bill Powell bill...@bellsouth.net wrote:


Does the leapsecond get added just once (GMT  time zone) or does it happen in a 
staggered fashion at the same hh:mm:ss within each timezone?

Thanks,
Bill


On Jun 29, 2012, at 10:54 AM, Mike S mi...@flatsurface.com wrote:


On 6/29/2012 2:46 AM, Hal Murray wrote:

That's Friday, the 29th.  The leap second doesn't happen until Sat, 30th.

I think 23:59:59 UTC is 16:59:59 PST.  UTC is 7 hours earlier than PST.

For a time-nuts list, there sure seems to be a lot of confusion. He was off a 
day, you're off an hour.

23:59:59 UTC is 15:59:59 PST
23:59:59 UTC is 16:59:59 PDT (which I assume most wall clocks are set to)


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic - 06130 Grasse - France
email: jean-louis.on...@obs-azur.fr
phone: (+33)[0]4.93.40.53.80




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Humor break

[Jean-Louis Oneto]

It seems that ROHS is involved: (tin) whiskers ?

On 11/06/2012 21:14, Bill Hawkins wrote:

Celia Rivenbark of Wilmington, NC, wrote a piece about an accident on
a Florida highway, headline Driving and shaving just don't mix.

In it she remarked that the woman who caused the accident appears to
have a face that would stop a clock and raise hell with small watches.

What I love about life is that you learn something new every day.
Who would have dreamed that watches could be affected too.

Bill Hawkins


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic
06130 Grasse - France
e-mail: jean-louis.on...@obs-azur.fr


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Humor break

[Jean-Louis Oneto]

With a T-Bird and a Lightning Bolt, we're almost on-subject here...
Jean-Louis

On 12/06/2012 00:46, Peter Gottlieb wrote:

As opposed to COS?  I think you're going off on a TAN.


On 6/11/2012 7:54 PM, d.sei...@comcast.net wrote:


Obviously, it's not a REACH to say that SIN was probably involved 
here... :-)




Ok, I'll go away now...



-Dave



- Original Message -


From: Jean-Louis Onetojean-louis.on...@obs-azur.fr
To: Discussion of precise time and frequency 
measurementtime-nuts@febo.com

Sent: Monday, June 11, 2012 2:44:31 PM
Subject: Re: [time-nuts] Humor break

It seems that ROHS is involved: (tin) whiskers ?

On 11/06/2012 21:14, Bill Hawkins wrote:

Celia Rivenbark of Wilmington, NC, wrote a piece about an accident on
a Florida highway, headline Driving and shaving just don't mix.

In it she remarked that the woman who caused the accident appears to
have a face that would stop a clock and raise hell with small watches.

What I love about life is that you learn something new every day.
Who would have dreamed that watches could be affected too.

Bill Hawkins


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic
06130 Grasse - France
e-mail: jean-louis.on...@obs-azur.fr


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Schematic capture, anyone?

[Jean-Louis Oneto]

I mostly use Target3001:
http://server.ibfriedrich.com/wiki/ibfwikien/index.php?title=Main_Page
It's commercial, but there are six different editions starting as low as 
59€, with digital+analog, schematics, PCB, autorouting, simulation, it's 
multilingual (German/English/French), and there is even a free 
evaluation version somewhat limited in PCB size and pins numbers, but 
nevertheless worth trying. They are also very responsive.

I also tried DesignSparks, which is free, but a lot less powerfull.
Just a satisfied user, standard disclaimers apply ! :-)
Jean-Louis

On 24/02/2012 01:52, paul swed wrote:

I favor ExpressPCs free schematic generation and board layout
But Now I have a whole new list to go looking for.
More time-nuts trouble ahead.
Regards
Paul

On Thu, Feb 23, 2012 at 8:36 PM, Bruce Lanekyr...@bluefeathertech.comwrote:


Good eve,

I must be the exception... I've tried Eagle, most recently about
three months back. I can't stand it. I find it, for my purposes, to be
about as intuitive as a Salvador Dali painting.

I've not yet tried DesignSpark, but it looks very promising.

Personally, I use an old version of OrCAD (9-dot-something, I
think).

Happy tweaking.

*** REPLY SEPARATOR  ***

On 23-Feb-12 at 18:38 Jim Hickstein wrote:


What do people use these days for schematic capture (and just possibly
PCB layout), for low-budget homebrew stuff?

 snippage

  It's been so long since I did

this, I
still own a T-square and a pile of contemporary relics like rules and
triangles.
  I'll get out my pencil sharpener if I have to.  But really, this must be
a
solved problem by now.  For less than $300?  I only need TTL, not
striplines or
any black magic like that.

I'm a Mac shop, but can of course run Windows if need be.  And to make
matters
worse, I prefer ANSI logic symbology over shovels-and-spades (or, really,
over
plain rectangles where you're expected to know what the part number
means).
This comes from exposure to Control Data, who were big on it back in the
day.  I
even used to be on the mailing list of the standards committee.  I suppose
that
all sank without a trace?  If it's still controversial, I apologize in
advance
for trolling.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner  Head Hardware Heavy,
Blue Feather Technologies -- http://www.bluefeathertech.com
kyrrin (at) bluefeathertech do/t c=o=m
If Salvador Dali had owned a computer, would it have been equipped with
surreal ports?


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic
06130 Grasse - France
e-mail: jean-louis.on...@obs-azur.fr


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Racal-Dana 1991 w. Option 4C - what is that ?

[Jean-Louis Oneto]

I checked the documentations I have, the option 4C isn't mentionned, but 
all the (Internal Reference) options 04x (04A=OCXO, 04B=High Stability 
OCXO, 04T=TCXO, 04E=High Stability OCXO (?)) are 10 MHz. There is a 
Reference Frequency Multiplier (Option 10) which allows to use 1, 2, 5 
or 10 MHz as an external reference.

The parts numbers are:
option 04A: 11-1710 (oscillator), assy=9444
option 04B: 11-1711 (oscillator), assy=9423
option 04E: 404386
option 04T: 11-1610 (plate assy) + 19-1208 (oscillator PCB)
option 10: 19-1164
Hope that helps,
Regards,
Jean-Louis

Le 30/01/2012 17:24, cfo a écrit :

On Fri, 20 Jan 2012 09:18:32 -0800, Larry McDavid wrote:



One does occasionally find Racal 9462 ocxo offered on eBay. Also, one
sometimes finds non-operational Racal instruments offered at low price
but which to have Option 04E installed. I convinced one seller to remove
the Option 04E module (the Racal 9462) and sell just that with much
lower shipping cost.

There is also what is evidently an older Racal frequency standard module
similar in appearance to the 9462 but which has screws attaching the end
plate rather than the soldered-can 9462; one of those is seen from time
to time on eBay from the UK but I have avoided that.


I have been looking for a Racal 9462 ocxo , for my Racal-Dana 1991
counter. I will prob. use my Tbolt anyway , and save the money.

But i'm confused ... Is it a 5 Mhz or a 10 Mhz unit.

I have found pictures of one claiming it's 5Mhz
http://www.jbtech.de/parts/racal_dana/9462.html

But i have also received a picture from jaap , with a racal 9492 , where
it clearly says its a 10Mhz unit.

Can anyone clarify ?

I think there was an option that enabled the use of other ocxo values
is that why a 5Mhz can be used , in some 1991's ?

If i ever decide to get a OCXO , i would like to get the right one.

Regards
CFO







___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic - 06130 Grasse - France
email: jean-louis.on...@obs-azur.fr
phone: (+33)[0]4.93.40.53.80


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rubidium (Rb) or Caesium (Cs)

[Jean-Louis Oneto]

I used that post processing to get a very precise positionning of my 
antenna, ie down to 1 cm or better, which greatly improve the stability 
of the GPS data.

Regards,
Jean-Louis

Le 19/10/2011 00:13, Jim Lux a écrit :


GIPSY is offered to all comers, for free.  All you need is the ability 
to generate RINEX format files.


http://apps.gdgps.net/

http://www.gdgps.net/

You can do (I understand, not having tried it) things like post 
process your data to compensate for ionospheric effects (measured by 
others)


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



--
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic
06130 Grasse - France
e-mail: jean-louis.on...@obs-azur.fr


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] PRN 08?

[Jean-Louis Oneto]

It's the bird:
--

GPS OPERATIONAL ADVISORY273
SUBJ: GPS STATUS  30 SEP 2011

1. SATELLITES, PLANES, AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I : NONE
B. BLOCK II: PRNS  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14
   PLANE   : SLOT D6, D1, C2, D4, E3, C6, A4, A3, A1, E6, D2, B4, F3, F1
   CLOCK   :  CS, RB, CS, RB, RB, RB, RB, CS, CS, CS, RB, RB, RB, RB
   BLOCK II: PRNS 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29
   PLANE   : SLOT F2, B1, C4, E4, C3, E1, D3, E2, F4, D5, B2, F5, B3, C1
   CLOCK   :  RB, RB, RB, RB, RB, RB, RB, RB, RB, CS, RB, RB, RB, RB
   BLOCK II: PRNS 30, 31, 32
   PLANE   : SLOT B5, A2, E5
   CLOCK   :  RB, RB, RB

2. CURRENT ADVISORIES AND FORECASTS :
A. FORECASTS:   FOR SEVEN DAYS AFTER EVENT CONCLUDES.
NANU  MSG DATE/TIME   PRN  TYPE SUMMARY (JDAY/ZULU TIME 
START - STOP)

2011080   180103Z Sep 201116   FCSTDV   263/0915-263/2115
2011081   201706Z Sep 201116   FCSTSUMM 263/0949-263/1647
B. ADVISORIES:
NANU  MSG DATE/TIME   PRN  TYPE SUMMARY (JDAY/ZULU TIME 
START - STOP)

*2011082   300308Z Sep 201108   UNUSUFN  273/0227-/
*C. GENERAL:
NANU  MSG DATE/TIME   PRN  TYPE SUMMARY (JDAY/ZULU TIME 
START - STOP)

2011047   160718Z Jul 201101   LAUNCH   /-/
2011074   042312Z Sep 2011 GENERAL  /-/

3. REMARKS:
A. THE POINT OF CONTACT FOR GPS MILITARY OPERATIONAL SUPPORT IS THE GPS
OPERATIONS CENTER AT 719-567-2541 OR DSN 560-2541.
B. CIVILIAN:  FOR INFORMATION, CONTACT US COAST GUARD NAVCEN AT
COMMERCIAL 719-567-2541 24 HOURS DAILY AND INTERNET
HTTPS://WWW.NAVCEN.USCG.GOV
C. MILITARY SUPPORT WEBPAGES CAN BE FOUND AT THE FOLLOWING
HTTPS://gps.afspc.af.mil/GPS  ORHTTPS://gps.afspc.af.mil/GPSOC

___
This is the GPS Status Message one-way mailing list.

Subscribe/Unsubscribe:http://cgls.uscg.mil/mailman/listinfo/gps

If you would like to report abuse of the CGLS listserv please send an email 
to:cglsad...@uscg.mil
---
Hope that helps,
Jean-Louis



Le 30/09/2011 15:11, Dan Rae a écrit :
After an 8 hour power outage yesterday things are getting back up, 
but, I'm sure unrelated; I find PRN 08 visible but no useable signal 
from it according to LH.


Is this me or the bird?

Dan

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Fast than light neutrino

[Jean-Louis Oneto]

Just a thought: would it be possible that the bedrock act as a 
negative-index composite material for neutrinos: that would make them faster 
than light, but since it's not in vacuum, they would still be politically 
correct ???

Jean-Louis
- Original Message - 
From: Poul-Henning Kamp p...@phk.freebsd.dk
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Friday, September 23, 2011 8:49 PM
Subject: Re: [time-nuts] Fast than light neutrino


In message 
CAL8XPmO_T-R1y=qumswtunhdnme0seti+6xtdgww4jdvz2j...@mail.gmail.com

, Azelio Boriani writes:


More: are neutrinos supposed to travel from CERN to Gran Sasso via what?


Via solid rock.


Is there a 730Km long empty pipe [...]


No, and you'd need one to actually try the same distance with photons.

The complication is that the solid rock path is actually used as sort
of a filter for the neutrinos, nothing else goes through 730km bedrock
so if you see anything coming from that direction, you can be pretty
certain that it is neutrinos.


--
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by 
incompetence.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] What is NIST official time ?

[Jean-Louis Oneto]

See from here (France), it is right on time with my M12T GPS, at least when 
I display them side by side oçn my screen. Seems to be better than the 0.4 s 
accuracy annouced.

The derivation of NIST time is described here:
http://www.time.gov/about.html
Best regards,
Jean-Louis
- Original Message - 
From: Christopher Quarksnow cquarks...@gmail.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Thursday, August 04, 2011 2:16 PM
Subject: [time-nuts] What is NIST official time ?



Wondering whether anyone can clarify what discipline the Boulder, CO NIST
facility is broadcasting (or showing on time.gov) and qualified as The
official U.S. time.
It appears to be about 20 seconds slower than UTC and I could not find the
relation to other known time scales such as TAI, UTC, ET, UT1, GPS or
possibly grid or broadcast-interconnected reference.

Thanks !
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] How does it work?

[Jean-Louis Oneto]

Hello,
Roughly, the temperature can be seen as a measure of the brownian motion (ie 
shaking) of the atoms.
So if you keep the atoms at rest, it's equivalent to cooling them. One 
definition of the absolute zero is that there is no motion of atoms.

HTH,
Jean-Louis
- Original Message - 
From: William H. Fite omni...@gmail.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, June 28, 2011 4:55 PM
Subject: [time-nuts] How does it work?



For the sake of this poor, befuddled non-engineer, would one of you worthy
gentlemen explain how it is that lasers striking a mass of cesium atoms 
and

compressing them into a ball (in a cesium fountain) has the effect of
cooling them to near absolute zero?  That seems counter-intuitive to me, 
but

then I have virtually no education in this area.

Thanks!

Bill
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] What are these towers?

[Jean-Louis Oneto]

There is a link to Wikipedia: 
http://google-earth-fake-url-for-links.google.com/http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FKNTH

It's the KNTH AM station.
Jean-Louis
- Original Message - 
From: Stan, W1LE stanw...@verizon.net
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Friday, May 20, 2011 10:39 PM
Subject: Re: [time-nuts] What are these towers?



1. Towers are painted so they may be over 200' tall.
2. Two different tower height variations, 2 each shorter and 9 each 
taller..

3. Interesting symmetry between the shorter and taller towers.
3. In a congested residential area. Probably too noisy for a Rx site.
4. Gated entry on asphalt driveway. I can not see if the fence has tiered 
barbed wire on the top.

5. Some kind of phased array of verticals, maybe MW (AM band)  thru HF
6. Maybe commercial, unattended TX remote site, no vehicles in sight in 
the antenna filed.

7. Interesting shadow, must have been taken ~ local noon time.
8. Maybe a gov radio site.

Stan, W1LE



On 5/20/2011 5:54 PM, Jason Rabel wrote:

29° 59' 34N,  95° 28' 24W




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] What are these towers?

[Jean-Louis Oneto]

The link went corrupted, I don't understand why. It should read:
http://en.wikipedia.org/wiki/KNTH
Sorry,
Jean-Louis
- Original Message - 
From: iov...@inwind.it
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Friday, May 20, 2011 10:54 PM
Subject: Re: [time-nuts] What are these towers?



The link doesn't work. What is a fake-url-for-links ?
Antonio I8IOV


There is a link to Wikipedia:
http://google-earth-fake-url-for-links.google.com/http%3A%2F%2Fen.wikipedia.

org%2Fwiki%2FKNTH

It's the KNTH AM station.
Jean-Louis



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Sidereal timekeeping

[Jean-Louis Oneto]

Hello list,
I tried that a long time ago, but the trap I went into was that the 
capacitance of the 'scope probe was pulling the frequency down, so I ended 
with a crystal too high in frequency...
I'm not sure that you can control the frequency without significantly 
perturbing it. And waiting to check the rate between each tuning step would 
take a long time...

Regards,
Jean-Louis
- Original Message - 
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, May 17, 2011 1:22 AM
Subject: Re: [time-nuts] Sidereal timekeeping



Jim Lux wrote:

On 5/16/11 2:58 PM, iov...@inwind.it wrote:

Neville,
at present I have not enough skill with micros to solve the problem.
I think I will try modifying a crystal. This would not be that difficult 
using
a lapping sheet or the like. And opening the can would be quite easy 
using hot

air.


or a fine jeweler's saw or tubing cutter.

As you pointed out, the crystals are cheap, so you can afford to ruin a 
few while figuring out how to do it.


(and then, remember us all, when you're a multi-billionaire having 
cornered the market on sidereal rate crystalsgrin)



Since the 32 kHz crystal is likely to be a tuning fork form, one merely 
needs to shorten the tines to increase the frequency.
It may be feasible to do this without removing any of the electrode 
metallization.


Bruce

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Sidereal timekeeping

[Jean-Louis Oneto]

Hi again,
I forgot to mention this nice piece of software useful to check what you're 
doing:

http://www.gb.nrao.edu/~jbrandt/jLSTclock/
Jean-Louis
- Original Message - 
From: Jean-Louis Oneto jean-louis.on...@obs-azur.fr
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, May 17, 2011 12:27 PM
Subject: Re: [time-nuts] Sidereal timekeeping



Hello list,
I tried that a long time ago, but the trap I went into was that the 
capacitance of the 'scope probe was pulling the frequency down, so I ended 
with a crystal too high in frequency...
I'm not sure that you can control the frequency without significantly 
perturbing it. And waiting to check the rate between each tuning step 
would take a long time...

Regards,
Jean-Louis
- Original Message - 
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, May 17, 2011 1:22 AM
Subject: Re: [time-nuts] Sidereal timekeeping



Jim Lux wrote:

On 5/16/11 2:58 PM, iov...@inwind.it wrote:

Neville,
at present I have not enough skill with micros to solve the problem.
I think I will try modifying a crystal. This would not be that 
difficult using
a lapping sheet or the like. And opening the can would be quite easy 
using hot

air.


or a fine jeweler's saw or tubing cutter.

As you pointed out, the crystals are cheap, so you can afford to ruin a 
few while figuring out how to do it.


(and then, remember us all, when you're a multi-billionaire having 
cornered the market on sidereal rate crystalsgrin)



Since the 32 kHz crystal is likely to be a tuning fork form, one merely 
needs to shorten the tines to increase the frequency.
It may be feasible to do this without removing any of the electrode 
metallization.


Bruce

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Sidereal timekeeping

[Jean-Louis Oneto]

I realized that there was lot of way to avoid this [pulldown] problem, but 
as I said, it was a long time ago (around 1976...), I was young and 
inexperimented, and I just tried once on an almost broken 5 FF (~$1) 
wristwatch, then I decided that the software approach would be better for 
me.
I used a fine-grained handheld sharpening stone very carefully and just a 
few light touchs were enough (um, rather too much!).
It also depends on what precision you're expecting. I hoped to reach few 
seconds a day and it was rather tens of second or few minutes. Not so bad, 
but if I had to reset the sidereal time once a day, it was almost useless 
for me... At that time, I ended with a small program on an HP-65 (then 
latter transposed to an HP-41CV), and I soon added a small star catalog 
including proper motion and precession data for all the targets we were 
working on at that time (Optical interferometry with aperture synthesis).

YMMV...
Regards,
Jean-Louis
- Original Message - 
From: iov...@inwind.it
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, May 17, 2011 1:05 PM
Subject: Re: [time-nuts] Sidereal timekeeping



Hi Jean-Louis,

I'm pleased to hear that you had success trying to modify such a crystal,
though you had problems checking the frequency.
Regarding this aspect that I'm aware of, my idea is to hear to the 32kHz
signal with a HP3586A selective voltmeter or a RS VLF receiver. Further, 
as

electric-guitar players do know, the 1 pps pulse of wristwatches is easily
picked up by guitar pickups (many use wristwatches to check pick-ups). 
These
pulses could be compared to pulses coming from, say, a properly set 3325A. 
And
I will use a wall-clock machine which I suppose is stronger than a 
wristwatch.

As there is no issue, to some extent, with the lenght of wires between the
crystal and the circuit at these frequencies, I was also speculating about 
a
quasi-continuous monitoring of the trimming process, where for trimming I 
could

use a disc of lapping sheet glued to a Dremel disc.

Well, just arrived another suggestion from Bob LaJeunesse too.

Regarding software applets (your other post) I have several of them, but 
as I

said my problem is different.

Thanks,
Antonio I8IOV


Hello list,
I tried that a long time ago, but the trap I went into was that the
capacitance of the 'scope probe was pulling the frequency down, so I ended
with a crystal too high in frequency...
I'm not sure that you can control the frequency without significantly
perturbing it. And waiting to check the rate between each tuning step 
would

take a long time...
Regards,
Jean-Louis
- Original Message - 
From: Bruce Griffiths bruce.griffi...@xtra.co.nz

To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, May 17, 2011 1:22 AM
Subject: Re: [time-nuts] Sidereal timekeeping



Jim Lux wrote:

On 5/16/11 2:58 PM, iov...@inwind.it wrote:

Neville,
at present I have not enough skill with micros to solve the problem.
I think I will try modifying a crystal. This would not be that 
difficult

using
a lapping sheet or the like. And opening the can would be quite easy
using hot
air.


or a fine jeweler's saw or tubing cutter.

As you pointed out, the crystals are cheap, so you can afford to ruin a
few while figuring out how to do it.

(and then, remember us all, when you're a multi-billionaire having
cornered the market on sidereal rate crystalsgrin)



Since the 32 kHz crystal is likely to be a tuning fork form, one merely
needs to shorten the tines to increase the frequency.
It may be feasible to do this without removing any of the electrode
metallization.

Bruce

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.





___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Symmetricom TruTime XL-DC date error

[Jean-Louis Oneto]

Hello
If it's a rollover problem, you should try 26.09.1991 (which is 1024 weeks 
before today).

HTH,
Jean-Louis
- Original Message - 
From: Peter Loron pet...@standingwave.org

To: time-nuts@febo.com
Sent: Thursday, May 12, 2011 5:46 PM
Subject: [time-nuts] Symmetricom TruTime XL-DC date error


Hello, group. I've got a Symmetricom TruTime XL-DC, which appears to be 
working ok now that I have the proper antenna. However, it thinks the date 
is 2031.


Is this a known firmware issue for these boxes?

Thanks.

-Pete

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] GPS position averaging software?

[Jean-Louis Oneto]

Hello John,
If your M12+ is a Timing model, then there is no NMEA mode...
HTH,
Regards,
Jean-Louis
- Original Message - 
From: John Ackermann N8UR j...@febo.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Thursday, April 14, 2011 3:35 PM
Subject: Re: [time-nuts] GPS position averaging software?


Thanks, all, for the suggestions.  I'm playing with WinOncore12 at the 
moment -- for some reason I'm not able to get the M12+ receiver into NMEA 
mode so VisualGPS isn't usable.


I'll fuss more with NMEA mode this weekend, but is there any magic for the 
ioformat switch?  I've used the command from both Tac32 and WinOncore but 
the receiver stays stuck in binary mode.


John


On 4/13/2011 3:05 AM, David J Taylor wrote:

John,

Visual GPS (http://visualgps.net/) will do this for you.

[]


-Kevin


Seconded. It works with Garmin GPS 12 XL and GPS 60 CSx, and likely many
others. Very nice position performance plot with both mean and least
squares averages.

I've just tried the u-Blox Control Center which Achim mentioned, and
that looks like a useful test toll as well.

David



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] MAR-5?

[Jean-Louis Oneto]

Hello,
In fact there was once (in the '80s I think) a MAR-5, but last time I had to 
replace one, I was unable to find the datasheet either, and I replaced it by 
an ERA-5SM+ which was fine.

Best regardzs,
Jean-Louis Oneto

- Original Message - 
From: John Green wpxs...@gmail.com

To: time-nuts@febo.com
Sent: Thursday, March 10, 2011 5:49 PM
Subject: Re: [time-nuts] MAR-5?



Doh! Never mind. It was the ERA-5SM I was thinking of. Boy, my age is
beginning to show. Apologies.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] SR620 calibration

[Jean-Louis Oneto]

I have a scan of the schematics (A3 format), but it is rather heavy (3.6MB); 
Do you know of a place to store such a beast ? I have also a copy of the 
manual it self, but that's easier to find (I got mine from the SRS web site)

Have a nice day,
Jean-Louis Oneto
France
e-mail: jean-louis.on...@obs-azur.fr

- Original Message - 
From: J. Forster j...@quik.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Sunday, February 27, 2011 9:27 PM
Subject: Re: [time-nuts] SR620 calibration



And the schematics? I've tried without success.

Repairing hardware w/o schematics is pretty tough.

-John

===



Regarding the SR620 counters, I must have missed something It
seems to me that SRS is providing about as much support as Tek or
Agilent. All three offer PDF manuals and repair service. I doubt any
of them have free telephone repair support for out-of-warranty
products.

I did a Google search for stanford research sr620 manual pdf and it
returned a number of sites, including SRS and NASA, that had the SR620
manual available for free download in PDF format. I had looked for
that manual several years ago and found it then too. I did a quick
compare against the paper copy of the manual and it seems to be
similar although I will not say exactly the same since I didn't look
that close.

Since the manual has full directions for using the counter and for
doing calibration, I don't understand the comments that SRS doesn't
support the product and make the info available. The schematics are
not included in the PDF manual but that is true of most electronic
products. I expect my paper manual has them although I haven't
checked.

Regarding the cost of repairs, I don't care what company you talk to,
they are ALL too expensive for me. But since I didn't buy the
equipment new with a warranty I don't see where that is their problem.
I bought my car out of warranty and I don't expect the dealer to do
repairs for cheap. I have several pieces of test equipment that were
labeled Not Economical To Repair. That is why they were in the scrap
bin. But they work good enough for me to use as long as I can live
with the fault.

I do like the counter even though I've never used any of the advanced
features it has. My only complaint was the 10^-6 accuracy of the TXCO
reference oscillator but since I can calibrate it at will and can use
my Z3801A as an external reference, I can live with that. Somewhere
along the line I need to do some research or get one of the gurus on
the reflector to explain how to use the SR620 for doing Allen variance
and other quality checks of the various GPSDO, rubidium, and OCXO
oscillators I've collected in recent years. That is about the most
advanced feature I need from the SR620.

I probably don't qualify as a real time-nut since my main interest is
to get my 10GHz station within a few hundred Hz of 10368.100 MHz. A
few parts in 10^-11 is good enough for that. And I would like to
compare my various reference oscillators just to verify they are
working as well as can be expected. But that doesn't make me a REAL
time-nut :-)

I don't intend to rekindle the previous discussion, I just don't
understand the negative comments. I have several SR620 counters and
for a 1GHz counter I think they are pretty good. For higher
measurements I got lucky on eBay purchasing an EIP 25B counter that
seems almost new. I didn't get as lucky with the HP 5340A I bought
first. Expensive and unobtainable mixer parts make the 5340A
unrepairable.

I do enjoy the technical discussions on the list. I particularly liked
the discussion about rejuvenating a rubidium lamp. The N4IQT web page
mentions the procedure but the time-nuts discussion provides a lot
more detail. That should be added to a web page somewhere along with
long term measurements of the results to indicate how the fix is
holding. I'm sure there are a lot of people who would be interested in
extending the life of their old rubidium oscillator. Having that info
would certainly make me sleep better if buying a surplus rubidium on
eBay.

73, Doug Reed, N0NAS.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.






___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] Looking for service manual for WG SNA23 spectrum analyzer

[Jean-Louis Oneto]

Hello,
By any chance, would anybody have a service manual for a spectrum analyzer 
model SNA23 (same as BN2101/23) from Wandel  Goltermann.
Otherwise, a service manual for another model in this serie 
(SNA-20/-23/-30/-33) would be also helpful.

Thanks in advance,
Jean-Louis Oneto
France
e-mail: jean-louis.on...@obs-azur.fr 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Looking for service manual for WG SNA23 spectrum analyzer

[Jean-Louis Oneto]

Hi Gerhard !
I have exactly the same error message. I checked the user manual (page 8-1 
of my edition), and they mention that it could be the lithium battery on the 
CPU board. Inside mine, the model of the battery is Renata 1000-0B, (CR2477N 
Lithium, 3 V, 950 mAh, inside an horizontal orange box 30x30x10 mm) and it's 
socketed.
It seems not too difficult to find: http://www.renata.fr/modulesDoc.php, but 
I am unable to find reseller in Europe, and there is restriction of export 
to UE from the USA... 8-{
There is still a possibility with Farnell, but their site is offline for 
maintenance right now.
They said that that's a CR2477N battery inside the package. That one is a 
lot easier to find, but I will have to check if I can tear apart the box and 
replace only the cell... There is a big warning Do not open ...

I will let you know
Best regards,
Jean-Louis


- Original Message - 
From: Gerhard Hoffmann dk...@arcor.de

To: time-nuts@febo.com
Sent: Monday, February 21, 2011 10:10 PM
Subject: Re: [time-nuts] Looking for service manual for WG SNA23 spectrum 
analyzer




Am 21.02.2011 22:50, schrieb Jean-Louis Oneto:

Hello,
By any chance, would anybody have a service manual for a spectrum 
analyzer model SNA23 (same as BN2101/23) from Wandel  Goltermann.
Otherwise, a service manual for another model in this serie 
(SNA-20/-23/-30/-33) would be also helpful.


Same problem here, with a SNA-33. Mine thinks that its disc controller is 
defunct. Maybe I still
can get service for it (called them last year), might be only the battery 
for the CMOS ram disk...
Eningen is not far from here, perhaps a 40 min. drive. Currently I only do 
software and digital
stuff and cannot really justify the expense, but the SNA-33 is still a top 
notch SA and would

deserve repair  calibration.

regards, Gerhard, dk4xp

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Problems with Garmin - maybe we should cut them a little slack

[Jean-Louis Oneto]

Let's look at it from another point of view:
as it is, the map data store about very few points for each road (less than 
10 in most cases anyway).
To have correct coordinates for each number on each road (I suppose here 
that these data exist somewhere...) would multiply that by a factor between 
10 and 100, if not 1000, and I think I'm rather conservative here.
The last map I have from Garmin are almost 2GB for North America, more than 
3 GB for Europe: do you know of a device (beside HDD/SDD, which must be 
excluded for volume/weight/price/shock_sensitivity in most of GPS related 
uses) able to store 100's of GB ?

Happy New Year to all of you,
Jean-Louis Oneto

- Original Message - 
From: J. Forster j...@quik.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Friday, December 31, 2010 5:49 PM
Subject: Re: [time-nuts] Problems with Garmin - maybe we should cut them a 
little slack




Well, I won't rant back at you, Dick, but your expectations are way off
base.  GPS cartographers have to designate billions (yes, billions) of
addresses and the fact that they miss a few scarcely justifies a backhand
brushoff as shoddy work.


Look at it another way:

They are producing one product for 10s of millions of customers. The
reproduction costs are trivial, so they have hundreds of millions of
dollars to get one product right!


Can you have a product of this size and complexity that is completely
error free.  No.  No matter how hard you try, the answer remains...no.
(References on stochastic processes available on request.)

Can you have a product with* fewer* errors?  Of course.  Can you have it
for eighty bucks.  Nope.


The $80 is for one copy. Try near a $1,000,000,000 for the digital map of
the USA.


Be a good capitalist and take your choice.



-John

=


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Dead Thunderbolt Explored - Any Chance of Resurrection?

[Jean-Louis Oneto]

Hello,
Last time(s) I found similar symtoms (in somewhat different equipments), the 
main culprit was a tantal capacitor failed in short-circuit mode. It could 
be worth a check...

HTH,
Best regards,
Jean-Louis

- Original Message - 
From: Hal Murray hmur...@megapathdsl.net
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Sunday, November 28, 2010 8:13 PM
Subject: Re: [time-nuts] Dead Thunderbolt Explored - Any Chance of 
Resurrection?





1.  Is it likely that the FPGA is the culprit or just the victim of 
another

failure?


It could be getting hot trying to drive some signals while some other chip 
is

driving it in the other direction.

You might poke around and see if you can find any signals that aren't at a
clean high or low.

Or look for signals that are shorted to Gnd or Vcc.  Maybe add a few mA of
load and see if they shift a bit.



2.  What is the likelihood of repair?


My guess would be low, but what do you have to lose if you feel like 
trying

something?



--
These are my opinions, not necessarily my employer's.  I hate spam.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Setting clocks 100 years ago

[Jean-Louis Oneto]

Other Timeballs that I know are at USNO (Washington DC) and Real 
Observatorio de la Armada (ROA, San Fernando, Cadiz, Spain).

Regards,
Jean-Louis
- Original Message - 
From: Dave Brown tract...@ihug.co.nz
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Friday, November 05, 2010 11:37 AM
Subject: Re: [time-nuts] Setting clocks 100 years ago


Another existing sample of a time ball station close to home (for me) is 
here in Lyttelton near Christchurch, NZ (quake city)

http://www.teara.govt.nz/en/timekeeping/2/3
It too suffered some building damage in the recent seismic event but will 
no doubt be restored in due course.

 Worth a look if you're ever out this way.
DaveB, NZ

- Original Message - 
From: Murray Greenman murray.green...@rakon.com

To: time-nuts@febo.com
Sent: Friday, November 05, 2010 12:30 PM
Subject: [time-nuts] Setting clocks 100 years ago



Navigators used chronometers to determine their longitude. If they were
stopped in one place long enough, they could work out longitude by a
complicated process of star and lunar observations; however, when they
left an established port, they usually took with them a time standard
based on local measurements of the sun and the known location of the
port.

These measurements used a device called a 'Transit', which was a simple
telescope mounted so that it pivoted in elevation, but was fixed N-S in
azimuth. Midday was marked by the time at which the sun transited the
telescope. It thus had higher resolution than a sundial. Getting N-S
axis correct involved determining by iteration and surveying the axis
that gave maximum elevation at time of transit.

Once the transit was observed, a large ball on top of the building was
dropped, indicating midday, and in some locations a cannon was also
fired. Ships in port could observe the ball drop and hear the cannon. To
this day the ball drops at midday at Greenwich.


73,
Murray ZL1BPU


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] A real world project need for timing accuracy...

[Jean-Louis Oneto]

In the atmosphere, if your aperture is smaller than the R_0 (Fried 
parameter, typically about 1~2 in daylight, can be several feet by a still 
night), your resolution is similar to that corresponding at your aperture, 
and the whole image will seems to move. If your aperture is greater than 
R_0, the image will explode in several speckles, each with a size 
corresponding to the diffraction limit of your aperture, grouped in a 
cluster corresponding to the diffranction limit of R_0, and the pattern of 
the speckle will change rapidly (several 10's of Hz). You can exploit the 
theoritical diffraction limit by using a fast camera, processing each frame 
(autocorrelation or FFT) and then averaging the results. (search Speckle 
Interferometry for details, that will hardly be low-cost or easy...)

HTH,
Regards,
Jean-Louis
- Original Message - 
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Wednesday, November 03, 2010 12:04 AM
Subject: Re: [time-nuts] A real world project need for timing accuracy...



Hi

The Wikipedia numbers would all work out just fine in a vacuum or in 
*very* still air. I have yet to find a real world situation (daylight) 
where you are anywhere near those conditions.


Bob


On Nov 2, 2010, at 1:16 PM, Robert Darlington wrote:


Hi Jim,

This doesnt' look right to me.  I'm getting roughly 2.3 inches at 2400 
feet
is 0.08 miliradians.0.01  miliradians (1*10^-5 radians) at 2400 feet 
is

0.288 inches (roughly 30 caliber).  Wikipedia says that to resolve 0.01
miliradians you need:

R (in radians) = lambda / diameter (of scope)  (aka, Dawes Limit if you 
use

562nm light)

1 * 10^-5 radians = 562nm (green) / X

X= 5.62cm aperture or 2.2.This is what it comes to on paper, in
practice you'd probably need something bigger because of atmospheric
effects, lens quality, and the like.

That being said, I can't see my holes at 300 yards with my Leupold scope
with an opening greater than an inch.  I can just barely make them out at
200 yards.  See http://en.wikipedia.org/wiki/Angular_resolution  - Also,
somebody please double check my math.

-Bob

On Tue, Nov 2, 2010 at 7:28 AM, jimlux jim...@earthlink.net wrote:


Bob Camp wrote:


Hi

Ok, I mis-understood the question.

In my experience, you can have big buck (as in many thousands of 
dollars)
optics and not see .2 holes at 800 yards. The bull's eye is a *lot* 
bigger

than the hole the bullet made.

0.2 at 2400 ft is about 0.08 milliradian.. or 0.3 minutes of arc. 
Your

eye can resolve about 1 minute of arc... I'm not questioning your
experience, but it seem that even a moderate power scope should allow 
you to
see the holes.  As I recall, the Rayleigh limit for resolution is 
something
like 0.7 milliradian/mm of aperture, so 10-15 mm aperture would be in 
the

right ballpark..

I can imagine needing more aperture than 3, though.. you're not 
interested

in resolving a star, but something more akin to separating dots.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Absolute time (was Time of death-Again)

[Jean-Louis Oneto]

Hi group,
The most absolute remarkable event in our _Universe_ is the Big Bang, and it 
seems to be pretty well defined in time. It's rather sad that we're unable 
to relate this event to our usual timescales (with a better precision than 
several 10^9 years...!)
That would make a nice absolute zero for time, at least in our tiny 
universe.

Jean-Louis
- Original Message - 
From: Brooke Clarke brooke95...@att.net
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Thursday, October 28, 2010 4:47 PM
Subject: Re: [time-nuts] Absolute time (was Time of death-Again)



Hi Bill:

The Mayan calendar does not stop in 2012, only the short hand year 
notation.
It's just like when our calendar stopped at 12/31/99, i.e the next year 
was ZERO (aka Y2K)!

See:
http://en.wikipedia.org/wiki/Mayan_calender
http://en.wikipedia.org/wiki/2012_phenomenon

Have Fun,

Brooke Clarke
http://www.PRC68.com


Bill Hawkins wrote:

If a far future observer was to make any sense of a date, quite
a lot would have to be known about the culture, including how to
read its markings.

It would be impractical to carve a map of the sky showing the
location of a stellar beacon on each tombstone, and then adding
some number of rotations of the Earth around the sun to it. How
would you describe leap seconds? Or seconds?

The use of BC and AD pervades our culture. What's needed is a
Rosetta Stone that has a lengthy description of the relation of
astronomical events to the year 0, after first describing the
time system (Y, M, D, H, M, S). Perhaps radioactive dating by
isotope ratios would be easier than describing years, using a
stellar event to pin down the base ratio to absolute time.

Any understanding of a culture includes an understanding of its
religions. Perhaps the Mayan calendar would be discovered first.
Too bad it stops in December 2012.

Bill Hawkins


-Original Message-
From: Raj
Sent: Thursday, October 28, 2010 9:17 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Time of death-Again

T=0 could be a recent supernova for a secular short measurement span
considering the life span of Earth.
OR
T=0 could also be a local solar system event that is easily determinable 
on

Earth.

For someone measuring events on Earth a million years from now, give or 
take

a ppm :-) or they may not care!


I think this is a sort of relativity question, isn't it?  That is, you 
just



have to pick some place/time, and reference everything else to that.  So
which astronomical event do you want use as your reference (e.g. a T=0
epoch)and is it sufficiently well determined that you can figure it out
later?  It's all well and good, for instance, to use noon on January 1st,
1900 or something as your time zero, but that's hardly a universally
available reference point.




--
Have Fun,

Brooke Clarke
http://www.PRC68.com


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Determining Time-Nut infection severity.

[Jean-Louis Oneto]

Since it's a volume, isn't rather 30k x 30k x 5k = 4.5 Gbit ?
(I ignored the toolholder parameter, I don't understand how to take it into 
account)

;-}

- Original Message - 
From: Poul-Henning Kamp p...@phk.freebsd.dk
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Sunday, October 24, 2010 8:58 PM
Subject: Re: [time-nuts] Determining Time-Nut infection severity.


In message 53601812-fc62-4098-9266-55edf50af...@nf6x.net, Mark J. 
Blair wri

tes:


Does anybody know how many bits of precision are used
on tombstones these days?


Most tombstones are engraved with CNC machines and while I have yet
to see a company advertise it as a competitive parameter, your vital
lack of stats will be engraved with better than 1/50mm precision.

On one picture I saw at cnczone.com they used approx 10 different
diamondcrusted bits.

Estimating bitcounts we find:

X-axis ~30k [60cm / 1/50mm]
Y-axis ~30k [60cm / 1/50mm]
Z-axis ~5k [10cm / 1/50mm]
Toolholder ~10 [visual estimate]
-
Total ~65k bits

:-)

--
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by 
incompetence.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] [rather OT] nice MJD

[Jean-Louis Oneto]

Hello,
I just realized that there will be a nice time coming: MJD=5.5, 
which happen to fall on Chrismas Day 25-Dec-2010 at 13:19:59.52 UTC.

I would dare to say that it must carry any theological significance...
Jean-Louis Oneto 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] No Comment

[Jean-Louis Oneto]

I suppose it could be something like leapprayers? (no offence intended!)
Jean-Louis Oneto
- Original Message - 
From: Don Latham d...@montana.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, August 10, 2010 9:49 PM
Subject: Re: [time-nuts] No Comment



Thing is, Islamic time stops 5 times a day...
Don

Tom Holmes

The reality of this, hoping not to deteriorate the discussion into
politics,
is that outside of the scientific community, the greater mass of the
population might be easily swayed to go along with the idea of moving to 
a

different time standard. After all, most of the planet's populace has no
clue about the need for standard time, or its history, and is likely to
see
the change as 'good'. And those who follow Islam will certainly not
object,
and they are a significant force on this planet.

You have all seen instances where voters have defied logic and good sense
to
'fix' a problem they could not be bothered to truly understand, so just
voted on gut or heart or whatever their favorite talking head told them.

So laugh or be skeptical, but be aware that there is enough power to make
such a thing happen if properly sold.

On the other hand, does it really matter? We have put up with the farce
that
is Daylight Saving Time for years.

Tom, N8ZM



-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: Tuesday, August 10, 2010 4:42 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] No Comment

http://www.google.com/hostednews/afp/article/ALeqM5hghTFlnZ0yYigLDaCnQT8
xowHaJA


-John

==


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to

https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




--
Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind.
R. Bacon


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Remove Pictic boards from envelopes

[Jean-Louis Oneto]

Nevertheless, there is a mention (with picture) of mine de plomb (=lead 
pencil) in the French version of Wikipedia:

http://fr.wikipedia.org/wiki/Mine_de_plomb
They were extensively used in Antiquity (Egyptians, Greeks and Roman).
But I don't think they have RoHS compliant problems ;-}
Jean-Louis Oneto

- Original Message - 
From: Alan Melia alan.me...@btinternet.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, August 10, 2010 11:12 PM
Subject: Re: [time-nuts] Remove Pictic boards from envelopes



Hi Jim ...being ironic...see the smiley
Alan
- Original Message - 
From: jimlux jim...@earthlink.net

To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, August 10, 2010 11:55 PM
Subject: Re: [time-nuts] Remove Pictic boards from envelopes



Alan Melia wrote:
 Pencil?? only us oldies know what that is... it is surprising the

lead

 pencil hasn't been banned under RoHS :-))
 Alan G3NYK



I don't know that lead (as in the element) has ever been used in
pencils.. I read a fascinating book on the history of the pencil a few
years back.. it described how graphite (the mines of Cumberland were
famous for graphite with good writing/drawing properties) was called
plumbago (lead ore) because chemical analysis didn't really exist and
the dense black substance seemed to resemble lead.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to

https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] A different timenuts interest

[Jean-Louis Oneto]

I also think so,
but Time-nuts are nuts about attoseconds, not decades... ;-}
Jean-Louis Oneto

- Original Message - 
From: Bob Camp li...@rtty.us
To: 'Discussion of precise time and frequency measurement' 
time-nuts@febo.com

Sent: Thursday, July 22, 2010 8:03 PM
Subject: Re: [time-nuts] A different timenuts interest



Hi

I assume that was Napoleon III rather than the original

(I'd hate to see the time-nuts list get banned by the French History
Police).

Bob

-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of mike cook
Sent: Thursday, July 22, 2010 3:27 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] A different timenuts interest

As a number of examples have been referenced in the reply to the
original post, I will add a note on one of  pendulums that Foucault
himself constructed.
 Foucaults original experiments used shortish cables, but Napoleon
wanted a more prestigeous affaire.  It was originally installed by
Foucault in the Panthéon in Paris in 1851, but was moved from there in
1855 to the  Musée des Arts et Métiers where it has been ever since. In
the doc I found it appears that the original cable has been used since
then.

The sphere :

   * steel, brass, lead .
   * diameter = 18 cm.
   * mass = 28 Kg.

The wire :

   * steel.
   * lenght = 18 m
   * has used since 1855.

The oscillation period of the Foucault's pendulum of the museum is 8,5 s
and is apparent complete rotation occurs in 31,78 h = 31h 47 min at the
latitude 48° 50 '.


 Unfortunately the cable reached its sell by date on the 18th May this
year when it broke, dropping the ball on the marble floor , denting it.
Most unfortunate.



Le 22/07/2010 04:02, Donald Henderickx a écrit :


On 7/21/2010 7:13 PM, Morris Odell wrote:

Hi all,

I have been asked to help with the construction of a Foucault
pendulum. This
is a long pendulum which oscillates in a slow stately fashion in a fixed
plane which appears to move as the earth rotates. In reality the
surrounding
environment is really moving relative to the plane of oscillation.

The pendulum requires a sustaining system to compensate for the
inevitable
energy loss with each swing. The system is located in the building and
therefore rotates relative to the pendulum. It needs to provide an
impulse
which does not affect the plane of oscillation of the pendulum. I was
thinking of an electromagnet located below the centre of the swing which
would be pulsed appropriately as the bob passes over it.

Has anyone here had any experience with such a system of have any
suggestions regarding the sustaining system? This is an interesting and
challenging project.

Cheers,

Morris



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



Hello Morris:
You might contact Fermi National Accelerator Lab in Batavia Illinois
at www.fnal.gov .
There Foucault pendulum is sixteen stories from the suspension point
to the atrium floor,it's impulse device is buried in the sand under
the bob.
They may even have a picture of it on there web site.
Try the public information office they should be able to get in
contact with the people that maintain it.
If you are unable to get any help let me know as I might have some
contacts there that would help.
Good Luck
Don Henderickx

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Long period variation of GPS PPS timing?

[Jean-Louis Oneto]

Hi,
If your GPS run in fixed position mode, how do you determine the position? 
Could this cycle be an artefact caused by a bad position? 50 mn could be the 
order magnitude of visibility of a satellite?

Just a thought...
HTH,
Regards,
Jean-Louis Oneto
- Original Message - 
From: David C. Partridge david.partri...@perdrix.co.uk
To: 'Discussion of precise time and frequency measurement' 
time-nuts@febo.com

Sent: Thursday, July 01, 2010 8:38 PM
Subject: Re: [time-nuts] Long period variation of GPS PPS timing?


Sawtooth variation in pps time - that does sound a bit familiar in 
reference to GPS timing.


e.g.: http://www.leapsecond.com/pages/m12/sawtooth.htm  but that's over 
a MUCH shorter time scale than you report which seems to a around 3000 
seconds.


So I wouldn't write it off as being unrelated to the GPS quite yet, but I 
admit I can't think of an obvious candidate with this sort of period.


Regards,
David Partridge


-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On 
Behalf Of Paul Nicholson

Sent: 01 July 2010 19:44
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Long period variation of GPS PPS timing?

FYI, some time has elapsed with one soundcard instead of two and the slow 
cycle is still present, same period, and the phase of the slow cycle did 
not make a step change.


Now I must take a careful look at how the centroid is being determined, 
the resampling, RC temperature, etc.
Maybe the 'sawtoothness' of the cycle should be telling me something.  If 
nothing jumps out at me, I'll change the rise/fall time constants of the 
RC network and see if that alters the slow cycle.

--
Paul Nicholson
http://abelian.org
--

___
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] GPS receiver stuck at South Pole :)

[Jean-Louis Oneto]

Sorry for late reply, I was away from home.
I spoke of high latitude problem mostly from book knowledge (GPS system 
specifications), et had in maind the navigation application, where you need 
at least 3 (2D+time fix) or better 4 (3D+time fix) birds.
Otherwise, my higher latitude experience  was around Borås, Sweden, and even 
if I had the feeling to get rather less bird than in South of France, my 
Garmin (iQue3600) was still very useable up there.

Have a nice day,
Jean-Louis
- Original Message - 
From: b...@lysator.liu.se
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Friday, April 16, 2010 9:21 AM
Subject: Re: [time-nuts] GPS receiver stuck at South Pole :)



Congratulations ;-}
Most of the time, it's rather difficult to get a GPS working at high
latitudes...


Is it high or low latitudes at the South Pole?  ;-)

Back to your GPS experiences... at what latitudes have you had problems?
What kind of application/type of receivers?

--

  Björn


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] GPS receiver stuck at South Pole :)

[Jean-Louis Oneto]

Congratulations ;-}
Most of the time, it's rather difficult to get a GPS working at high 
latitudes...


- Original Message - 
From: Hal Murray hmur...@megapathdsl.net

To: time-nuts@febo.com
Sent: Friday, April 16, 2010 12:08 AM
Subject: [time-nuts] GPS receiver stuck at South Pole :)




I've got a Garmin GPS 18 USB.  (18, not 18x)  It's inside.  I'm not 
surprised

when it fades out.

At first, I thought it was just giving a garbage location while trying to
find some satellites, but now that I've plotted it...

It took about 7 hours to fly from here to the south pole.  The latitude is 
a

straight line.  The longitude looks like an exponential.  Then it spiraled
around the south pole at lat  -89.995877.  It was there for a couple of 
days

before I power cycled it.  The trip back home was quick.



--
These are my opinions, not necessarily my employer's.  I hate spam.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Sound Card Spectrum Analyzer

[Jean-Louis Oneto]

Hello,
A long time ago (1996-2000...), there was a shareware program called 
CoolEdit (96 then 2k in case you didn't guess) that was really powerful, 
written by David Johnston. Unfortunately, (it was may be a little too smart 
;-} ), Adobe took it over and it become the Audition product, and of course 
make it a commercial product.
If you're able to grab a copy of the old shareware, the trial version, even 
limited on the number of filters and/or transforms you can use together, 
should be worth a try.

Best regards,
Jean-Louis
- Original Message - 
From: Bob Camp li...@cq.nu
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Friday, February 19, 2010 12:26 AM
Subject: Re: [time-nuts] Sound Card Spectrum Analyzer



Hi

Linrad is one that I have looked at. It was in a SDR adventure, but I've 
seen it. Lots of very neat RF stuff packed in there. Still missing the 
part that I'm after.


I guess I need a program written by an audio guy who's never heard of RF 
...


Bob

On Feb 18, 2010, at 7:08 PM, Stan, W1LE wrote:


Linrad should fill the bill.

Do a search for the SM5BSZ website

At his index page,   http://www.sm5bsz.com/update.htm

there is some recent work on phase noise.

Usable in Linux or windows. Not for the faint of heart, very capable,
very experimental, very flexible. Grab your saddle and hang on.

If Spectrum Laboratory does not immediately satisfy the need, contact the 
author


http://freenet-homepage.de/dl4yhf/spectra1.html

Stan, W1LE



Bob Camp wrote:

Hi

Assuming I have a decent sound card, and a computer, the next thing I 
need is software. If I want:


Required:

1) non- commercial 2) 1 Hz normalization
3) good low frequency processing (decimation ahead of the fft)
4) low cost

Much preferred:

5) a non-evil OS 6) Rational performance on a non-quad core system
7) free
8) rational calibration 9) scope view.
10) reasonable graphics
11) active support by the author

The application is measuring phase noise. That what makes 2  3 pop up 
on the list.
I've looked at a lot of programs and they all seem to be pretty slick. 
The ones I've looked at so far don't quite hit the mark for phase noise. 
I'm pretty sure that there are others on the list who have dug into this 
same issue already.


Bob
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.





___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Characterization of Oscillator w/ HP5345a

[Jean-Louis Oneto]

Yes, but the only problem is that you never know _when_ ;-}
Cheers,
Jean-Louis
- Original Message - 
From: J. Forster j...@quik.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Wednesday, January 13, 2010 2:04 AM
Subject: Re: [time-nuts] Characterization of Oscillator w/ HP5345a



The one that does not run at all is PRECISELY correct twice a day.

-John

=



paul swed wrote:

The more you know, the more you don't actually know.
Whats the saying?
A man with one watch knows what time it is. The man with three never
does.


 From an old film:

Q: Why do you have three watches?
A: Well, one runs slow, one runs quick and the third one doesn't run at
all.

This is why a man with three clocks does not know what time it is.

Cheers,
Magnus




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] are any time-nuts also random-nuts?

[Jean-Louis Oneto]

I'm not sure there is nothing behind the remark that the sum is somewhat 
average: a long time ago (1973...) I used sum (or rather average) of 
uniform PRN to generate gaussian PRN. I think it described either in The Art 
of Computer Programming - Semi-numerical algorithms (Knuth), and may be also 
in Numerical Recipes.
I didn't check if the standard deviation for 6 values in [1, 49] is 
consistent with the range used by your friend.

FWIW,
Jean-Louis
- Original Message - 
From: Dr. David Kirkby david.kir...@onetel.net
To: j...@quik.com; Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Thursday, December 24, 2009 11:03 PM
Subject: Re: [time-nuts] are any time-nuts also random-nuts?



J. Forster wrote:

Many years ago, when the State Lottern Numbers Game started up here, I
noticed that doubles were coming up a lot...  like 4662. I was utterly
convinced they were overrepresented.

However, being cheap and sane, I decided to test the theory before
spending $$. I collected ALL the numbers for a year or more and did
statistical tests, including FFTs on each digit wheel.

Bottom line, the numbers were random. It was my PERCEPTION of a pattern
that was tricking me.

All in, I spent $1 for a ticket to read.

YMMV,

-John


There's a guy in my local pub, that believe he has a way to increase his 
chances of winning the National Lottery in the UK. There are 49 balls 
numbered 1-49, and 6 balls are chosen at 'random'.


What he has discovered, with the aid of a spreadsheet, is that when the 6 
winning numbers are announced, they usually sum to a number somewhere in 
the range 130 to 170. Very rarely is the sum very low or very high. So he 
reckons that if he picks numbers 6 numbers, and ensures they sum to 
something in the range 130 to 170, he has more chances of winning than if 
he picks numbers with a low or a high sum.


Of course, the minimum they can sum to is 1+2+3+4+5+6 = 21, and the 
maximum is 44+45+46+47+48+49 = 279.


My wife thought I was going to have an argument with him once over this, 
so I decided to let him believe that his strategy maximises his chances of 
winning.


I'm sure I buy him far more beers than he ever buys me, so I guess his 
stratergy has not yet netted him the jackpot. I believe in the UK, the 
exptected return on a ?1.00 ticket is ?0.14, which is why I never do the 
lottery myself.



Dave

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] GPS chicken tracker (slightly OT butsorta-not-really)

[Jean-Louis Oneto]

Hello,
Around here (Provence, France), to describe a very steepy land, one say that 
the inhabitants need to attach nets to the hen *ss to avoid egg from rolling 
downhill...
Of course, it not electronic and don't solve the timing part of  the 
question, but since the original questin was _where_, that could a 
traditional approach...

Best regards,
Jean-Louis
- Original Message - 
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
To: j...@quik.com; Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Wednesday, December 23, 2009 8:02 PM
Subject: Re: [time-nuts] GPS chicken tracker (slightly OT 
butsorta-not-really)



The success of that will depend on the vegetation cover available to the 
chickens.
One problem is that at least some countries require that the time that the 
egg is laid be known to within a few hours.

Several day old eggs sitting in the heat of the sun cannot be sold.

Bruce

J. Forster wrote:

Depending on the range area, if it could be monitored with TV cameras, a
simple relaxation oscillator and IR LED on each chicken might work. 
They'd

be tiny and light weight.

The cameras could be equipped with narrow band pass optical filters and
the video frames added up into say 10 minute integrated images in a PC.
Because it's pulsed IR, it'd work both day and night.

The integrated image would look like a trail of bread crumbs, 
interspersed

with blobs where the chivcken stopped for a while.

FWIW.,
-John

==






Jim Palfreyman wrote:


A friend of mine has asked me for a good GPS method to find out where
his chickens are laying eggs.

A GPS tracker comes to mind but some
(http://www.coolest-gadgets.com/20060405/really-cool-portable-gps-tracker)
   seem good but expensive.

Does anyone have any cheap (and possibly smaller) alternatives?

Regards,

Jim Palfreyman




Turn the problem on its head and fix a transmitter to each chicken.
One can then use range measurements from several antennas to track the
chickens, just assign a unique PRBS code to each transmitter.
You should be able to do all this with a SDR and some software.
This is likely to be cheaper per chicken than using a GPS tracker.

Bruce




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

and follow the instructions there.






___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] GPS chicken tracker (slightly OT butsorta-not-really)

[Jean-Louis Oneto]

LORAN-C = Localization Of Roasters And Nesting Chickens !!!
I didn't realize that before !
Cheers,
Jean-Louis
- Original Message - 
From: Magnus Danielson mag...@rubidium.dyndns.org
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Thursday, December 24, 2009 12:32 AM
Subject: Re: [time-nuts] GPS chicken tracker (slightly OT 
butsorta-not-really)




Mark Sims wrote:

The answer is simple and elegant,  if I do say so myself:

Connect a small (or even better a large) eggsplosive charge to the 
chicken with a breakwire across the eggsit hole.   Chicken lays egg. 
Look for feathers/crater/red splatter/mushroom cloud...


There are few problems that the suitable application of high eggsploves 
can't cure...


Rigg a few mikes up and the sound-blast can be used for trieggulation. 
Maybe left-over LORAN-C receivers could be resued for the purpose. Just 
add the eggstra hardware needed...


Cheers,
Magnus

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Beginner's time reference

[Jean-Louis Oneto]

If you want a _Time_ reference, somewhat you need a way to 
compare/synchronize your time reference with others, event if it's the best 
cesium or maser available. If you only need a _Frequency_ reference, a 
rubidium will probably get you happy, even without exterior comparison...

Best regards,
Jean-Louis
- Original Message - 
From: Charl ch...@turingbirds.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Friday, December 11, 2009 12:00 PM
Subject: Re: [time-nuts] Beginner's time reference



Dear Hal and others,

Thank you for your suggestions. I suppose I should have emphasised that I
was looking to have my own reference, i.e. something not dependent on GPS,
LORAN, or other signals from the aether. Indeed I might get better 
accuracy
for less money by tapping the GPS time signal, but to me that's not as 
much

fun as building my own atomic reference.
Hal, is there much difference in quality for these rubidium tubes? Will I
get what I pay for? In any case, you make a good point about measuring the
accuracy. I'm a university student, so perhaps I can pay the physics
department a visit. Otherwise, maybe I could compare it to the GPS signal?

Kind regards,
Charl



On Fri, Dec 11, 2009 at 9:30 AM, Hal Murray hmur...@megapathdsl.net 
wrote:




 I'm hoping to build my own circuit around the device, which might cut
 down the costs somewhat. Some rubidium sources on eBay go for less
 than $100, but I'm not sure what quality to expect. Any advice or
 suggestions are appreciated!

Short answer:  Sure, get one of the $100 rubidium boxes and see what you
can
do with it.

Long answer:  You just stuck you toe into a huge tar pit.  Pick a corner
that
seems like fun and dive in.

How are you planning to measure if whatever you build is any good?



--
These are my opinions, not necessarily my employer's.  I hate spam.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] GPS time, UTC and TAI

[Jean-Louis Oneto]

Hello,
You should be aware that there is a _huge_ difference between UTC and TAI: 
UUTC is a timescale which have as many realisations UTC(k) as there is 
laboratories who want/need to realize it, but there is _no_ realtime 
representation of TAI and the recommendation of BIPM/CCTF is that there 
should _not_ be! It is a timerscale that is computed on a monthly basis (cf. 
Circular T), from the data of the preceding month. If you take the leap 
seconds  out of UTC (in fact UTC(GPS), steered close to UTC(USNO)), you will 
_not_ get TAI, just UTC(GPS)-34s...!

HTH,
Best regards,
Jean-Louis
- Original Message - 
From: Martyn Smith mar...@ptsyst.com

To: time-nuts@febo.com
Sent: Thursday, October 22, 2009 10:31 AM
Subject: [time-nuts] GPS time, UTC and TAI



Helo,

Re my last question.

I've read that GPS time is ahead of UTC time by 15 seconds and TAI time is 
ahead of UTC by 34 seconds.


I need to generate time to a display based on TAI time.

Any ideas how I can do that with a normal M12M GPS receiver.

Martyn

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Adret 4101A, the DCF77 and a good antenna

[Jean-Louis Oneto]

There is a good list of time signals on the web site of the BIPM:
http://www.bipm.org/jsp/en/TimeFtp.jsp?TypePub=scale#nohref
in the Time Signals in the Scales division of the FTP server of the Time, 
Frequency and Gravimetry section. The most recent is dated 2008.

Regards,
Jean-Louis Oneto
- Original Message - 
From: Florian Teply use...@teply.info

To: time-nuts@febo.com
Sent: Wednesday, October 21, 2009 6:05 PM
Subject: Re: [time-nuts] Adret 4101A, the DCF77 and a good antenna



Am Wednesday 21 October 2009 01:16:55 schrieb Alan Melia:

Marco, have you considered that HBG on 75.0kHz might be stronger with you
from Switzerland??. In a lab or other complex quite often with off-air
standards the problem is local noise. I have a friend in Porto who used 
to
be able to lock to MSF when it was at Rugby a few years ago...I 
havent
asked since it moved north to Anthorn but I suspect he uses GPS now. If 
the

noise is not a problem these receiver will often work well on a resonable
wire antenna which is fairly easy to rig. Or see the PA0RDT MiniWhip 
design
for a very simple active low frequency antenna. This is used all round 
the

world for receiving weak amateur signals on 136kHz it is broadband up
to about 500kHz, and down to 40kHz Japanese frequency standard
transmissions. It is so small you can experiment to find the best quiet
position. At LF the secret is the higher the better.

I may very well be mistaken (and do hope so indeed), but isn't HBG about 
to be

shut down quite soon? Maybe that i'm mixing that one up with another one
though.
BTW, is there such a thing as a comprehensive page on frequency standard
transmissions on the web? That Japanese 40kHz sounds quite interesting...

And as far as i recall, reception of those LF signals is supposed to be 
better

at night as there probably is less man-made noise and better propagation.

HTH,
Florian

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] unités conventions internationa les

[Jean-Louis Oneto]

Check in a French dictionnary... that may helps!
Salut de  Grasse (France)!

- Original Message - 
From: AL1 alain2.bouc...@wanadoo.fr
To: j...@quik.com; Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, October 13, 2009 4:01 PM
Subject: Re: [time-nuts]unités  conventions internationales



John,
i don't understand mage, my dictionnary no more
is it some slangy expression?
salut de France!
Alain
F4GBC

- Original Message - 
From: J. Forster j...@quik.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Monday, October 12, 2009 11:07 PM
Subject: Re: [time-nuts] unités  conventions internationales



Thankfully, the enlightened use:

...
femto
pico
nano
micro
UNIT
kilo
mage
giga
tera
...

-John





___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] GPS from a window seat

[Jean-Louis Oneto]

I also once forgot to disable the audible overspeed alarm Ideal to stay 
discreet...

Jean-Louis Oneto
France

- Original Message - 
From: Jim Palfreyman jim77...@gmail.com
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Thursday, October 01, 2009 3:46 PM
Subject: Re: [time-nuts] GPS from a window seat



I've done this with two separate GPS units. One was a basic unit with
no maps - more designed for bushwalking, boating and other direct
navigation. It worked really well.

Just recently (a few days ago) flying to Perth I used my car-designed
Navman. It locked easily and I chuckled as it rapidly swept across
roads and intersection on the ground at 777 km/hr telling me Go to
nearest road.

Jim

Tasmania
Australia

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] time-nuts Digest, Vol 61, Issue 77

[Jean-Louis Oneto]

I also remember that one of Digital Equipment Corp. (DEC) VMS Operating 
System was defined in microfortnight...


- Original Message - 
From: Mark Sims hol...@hotmail.com

To: time-nuts@febo.com
Sent: Wednesday, August 19, 2009 8:18 PM
Subject: Re: [time-nuts] time-nuts Digest, Vol 61, Issue 77




Alas, yes,  the RCH is no longer politically correct.   It's slightly more 
acceptable cousin is now the RPH.


I have a friend that does monomolecular / monoatomic layers.  His 
definition of a thin film is a gnats ass spread over the Rockies...



On the subject of small things.  Let's replace that ugly unit of time, 
the nanosecond,  with a swooptier measure of time...  the femtofortnight. 
I once worked for a company that had utterly insane paperwork requirements 
for each project.  Clearly nobody ever read  any of it.  I would do a 
design in a week and the spend the next year twiddling my toes waiting for 
the rest of the company to catch up with the paperwork.  I wrote a spec 
for a board where all the timing was specified in ffn.  It was years later 
before anybody ever noticed and asked what the heck an ffn was.





_
Windows Live: Make it easier for your friends to see what you’re up to on 
Facebook.

http://windowslive.com/Campaign/SocialNetworking?ocid=PID23285::T:WLMTAGL:ON:WL:en-US:SI_SB_facebook:082009
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] Trak 8810 GPS station (Rb GPSDO)

[Jean-Louis Oneto]

Hello,
I'm looking for information about a GPSDO built by Trak Systems sometime 
around 1990 under the reference 8810 which include a Magnavox MX 4200 GPS 
unit and an Efratom Rubidium Oscillator FRS-C, 10 MHz, Part no. 814-100-1, 
S/N 1049, Date code 8649.
I found the manual for the Efratom FRS oscillators, even if this part number 
doesn't fit the part numbering given in the manual.
I have more problem with the GPS receiver. Till now I only found the NMEA 
proprietary sentences descriptions. I'm not sure if it will pass the GPS 
week rollover (aka y2k bug), since the unit was out broken since a long 
time.

And I found strictly no information on the Trak 8810 itself.
Every piece of information will be very welcome!
Thanks in advance,
Jean-Louis Oneto
Grasse - France
e-mail: jean-louis.on...@obs-azur.fr 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Trivia

[Jean-Louis Oneto]

And if  paying with timezones that can even be at least 48 celebrations... 
I'm not sure I will still be able to count the seconds after that!

Jean-Louis Oneto
- Original Message - 
From: Pete Lancashire p...@petelancashire.com
To: j...@quik.com; Discussion of precise time and frequency measurement 
time-nuts@febo.com

Sent: Tuesday, July 07, 2009 9:05 PM
Subject: Re: [time-nuts] Trivia



or next month if DD-MM-YY. Or if refreshments are included
celebrate both days ...

-pete



AT 5 MINUTES AND 6 SECONDS AFTER 4 A.M.,  ON THE 8TH OF JULY, THIS YEAR,
THE TIME AND DATE WILL BE: 04:05:06 07-08-09

THIS WILL NOT HAPPEN AGAIN UNTIL THE YEAR 3009!!!

-John








___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there. 



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] French Time offset

[Jean-Louis Oneto]

I don't have reference at hand but a long time ago there was a lot of 
national meridian references, but I think they disappeared by WWI or WWII in 
favor of the International Meridian in Greenwich. I agree that there was a 
Paris meridian (it is still engraved on a building of Paris Observatory, as 
well as San Fernando (Andalucia, Spain) was the reference meridian for 
Spain, etc.
As far as I know, Poland legal time is defined by UTC(PL), for USA, I'm not 
sure if it's UTC(USNO) or UTC(NIST), I believe that Germany is UTC(PTB);
I'm surprised that the _legal_ definition for UK is GMT, since there was an 
argument from British people that they cannot agree to suppress leapseconds 
in UTC without going to Parliament to change the definition for UK legal 
time. Any more insights ?
Have a nice day,
Jean-Louis Oneto
- Original Message - 
From: Rich and Marcia Putz rp...@bnin.net
To: time-nuts@febo.com
Sent: Wednesday, March 18, 2009 5:35 AM
Subject: [time-nuts] French Time offset


 Thanks John, yes I'm real.
 The 1978 date is correct, I'm looking for the article to quote. Prior to 
 the decree, France maintained a roughly twelve and a half minute offset. I 
 always was struck by this as the BIPM is located in France, and has been 
 for many years.  Disagreement on the location of the prime meridian 
 perhaps?
 Wow, I didn't expect that much response for a trivia question.
 Regards to all;
 Rich
 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] French Time offset

[Jean-Louis Oneto]

BIPM is an _international_ organisation, and apart to be in France, has 
nothing to do (and never had as far as I know) with the definition of French 
legal time. At least no more than for any other country UTC (or TAI) based.
Jean-Louis
- Original Message - 
From: Lux, James P james.p@jpl.nasa.gov
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com
Sent: Wednesday, March 18, 2009 12:58 PM
Subject: Re: [time-nuts] French Time offset





 On 3/17/09 10:35 PM, Rich and Marcia Putz rp...@bnin.net wrote:

 Thanks John, yes I'm real.
 The 1978 date is correct, I'm looking for the article to quote. Prior to 
 the
 decree, France maintained a roughly twelve and a half minute offset. I 
 always
 was struck by this as the BIPM is located in France, and has been for 
 many
 years.  Disagreement on the location of the prime meridian perhaps?

 Paris is at 2degrees 20 min longitude, which isn't enough to account for
 12.5 minutes.  Sevres (where BIPM is) is actually a bit to the west, so 
 even
 less solar time difference.



 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Railway Time and Standard Time

[Jean-Louis Oneto]

The measurement of Earth circumference by Eratosthenes is still a nice 
application of (solar) synchronisation...
http://en.wikipedia.org/wiki/Eratosthenes
The Time Balls (for example at USNO, DC, USA and Real Observatorio de la 
Armada in San Fernando, Andalucia, Spain are also nice early (one way) 
synchonisation devices. In Nice, France, there is still a solar triggered 
gun which annouce Noon to the inhabitants of the city since the Medieval Age 
(I don't have the exact date). The clocks on bellltowers had no other 
purpose either...
In fact, astronomy didn't needed synchronisation in ancient times, they were 
providing _the_time_definition_, hence synchronisation. In Islam at least, 
the basic religious events are still based on direct astronomic 
observations... (New Moon in particular)
Have a nice day,
Jean-Louis
- Original Message - 
From: Bill Hawkins b...@iaxs.net
To: 'Discussion of precise time and frequency measurement' 
time-nuts@febo.com
Sent: Wednesday, March 18, 2009 8:35 PM
Subject: Re: [time-nuts] Railway Time and Standard Time


 Thanks, Arnold.

 It's my impression that the need for time synchronization grew out of
 the need to schedule trains on limited tracks.

 Astronomy could have needed synchronization earlier, but the trains
 drove it as they grew in number.

 Any other early needs for synchronization? Longitude is a separate
 problem, one of traveling clocks.

 Bill Hawkins


 -Original Message-
 From: Arnold Tibus
 Sent: Wednesday, March 18, 2009 9:39 AM

 Searching the WWW I struggled about
 the expression Railway Time and found some very nice bloggs.

 http://wwp.greenwichmeantime.com/info/railway.htm

 Occasional Train Blogging: Central European Time:
 http://www.eurotrib.com/story/2007/1/29/183327/233



 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Loran-C French Clocks

[Jean-Louis Oneto]

Hello,
The French Legal Time Reference is defined since a 1978 decree by the 
UTC(OP) realisation of UTC, as stated here:
http://syrte.obspm.fr/index.php?prefix=tempslang=en

Furthermore, the International Earth Rotation Service at Paris Observatory 
is responsible for the leapseconds insertion in UTC...
Have a nice day,
Jean-Louis Oneto
Grasse - France

- Original Message - 
From: Magnus Danielson mag...@rubidium.dyndns.org
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com
Sent: Tuesday, March 17, 2009 7:27 PM
Subject: Re: [time-nuts] Loran-C  French Clocks


 Arnold,

 I therefore cannot see any problem is with France,
 but we have the need to define more precise and stable
 reference time from where we can then measure and add
 the Earth and Solar instabilities for our daily used standard
 watches, in order to be enabled still to continue living and
 travelling sun synchronously

 I hope not having been informed wrong so far,
 kind regards and always precise time

 Please recall that just because the TAI and UTC clocks is being
 maintained by BIPM just outside of Paris does not mean the same as being
 legally accepted basis of time within France.

 Citing relevant law stating that the time of France shall be UTC + 1h
 for normal time and UTC + 2h for summer time is providing the piece of
 the puzzle that I was asking for.

 I have read Swedish and Danish law in this respect, as well as most
 translations of the EC directive on summertime.

 It should be noted that I do not assume UTC = GMT.

 Cheers,
 Magnus

 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] OT: Basics of voltage calibration?

[Jean-Louis Oneto]

I suppose it was to to keep the electrolyt to slam around ;-}
???
Jean-Louis Oneto
- Original Message - 
From: Bill Hawkins b...@iaxs.net
To: 'Discussion of precise time and frequency measurement' 
time-nuts@febo.com
Sent: Sunday, March 15, 2009 4:24 PM
Subject: Re: [time-nuts] OT: Basics of voltage calibration?


 Yes, never load a standard cell.

 It's standard practice to put a jumper across the terminals of a
 galvanometer for shipping, so the needle (or mirror) doesn't slam
 around.

 Some years ago, I got a standard cell from eBay. The terminals had been
 shorted for shipping.

 Bill Hawkins


 -Original Message-
 From: Jürg Kögel
 Sent: Sunday, March 15, 2009 7:36 AM

 A good reference is the old Fluke publication Calibration - Philosophy
 in Practice
 by Steve Spang. (1975)

 Be very carefull with standard cells! Never load a cell. Use the cells
 only with high ohm null detectors.
 A loaded cell need a long time for regeneration (or come back never to
 the old value!)

 I think a good zener reference is a better practical solution for today.

 Juerg



 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] position determination over short distance

[Jean-Louis Oneto]

Hi,
A graphic tablet (11 square is a common size) should give you about 120 
positions/mm for something like a hundred bucks.
That's not very different from the mouse solution, but give you absolute 
position rather than relative.
Regards,
Jean-Louis Oneto

- Original Message - 
From: Rick Harold [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Monday, November 24, 2008 2:34 AM
Subject: [time-nuts] position determination over short distance


 All,

 I'm planning doing some experiments in distance measurement.  They don't
 deal with atomic time directly but with extreme short periods of time.

 I need to determine the position of a instrument with a 1mm accuracy or
 less.
 The instrument is not connected to a mechanical device but is separate 
 independent.
 The surface which the instrument is positioned on is close to the size of 
 a
 11x11 square.

 I thought of using 1 RF transmitters (not sure of freq) on bottom of the
 device near the surface.
 The surface would have RF receivers on 3 or 4 edges/corners to receive the
 signal.

 If each of the receivers positions are known and they then send a signal 
 to
 a central circuit (again known positions) how can I differentiate the time
 of arrival
 at the central location?  Does anybody know of a circuit/chip or system
 which would determine the time 'difference'.
 Obviously this is used to triangulate the position of the instrument.
 Light travels 1 mm in ~3.3 picoseconds so I would suspect the 
 differentiator
 would have to have that or better resolution.
 It could also use some proportional method to extrapolate the position 
 since
 the surface has a fixed size.

 Any ideas/thoughts?

 Thanks in advance.

 Rick Harold
 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Oh the horror

[Jean-Louis Oneto]

- Original Message - 
From: Neon John [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com
Sent: Thursday, November 20, 2008 4:29 AM
Subject: Re: [time-nuts] Oh the horror


[...]

 When the aroma of blue smoke wafted through the air, I'd usually get 
 company
 for some commiseration, a good back rub and sometimes other condolences. 
 A
 properly spec'ced wife-mate is worth more than even a hydrogen maser.

Especially if her has long-term stability as well...



 IMO of course.

 John
 --
 John De Armond
 See my website for my current email address
 http://www.neon-john.com
 http://www.johndearmond.com -- best little blog on the net!
 Tellico Plains, Occupied TN
 I'm so cool, I'm afraid to catch cold.


 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] What is opt 06 on BVA8600

[Jean-Louis Oneto]

Hi,
Extrapolating the short-term stability options for the 8607 ( 
http://www.oscilloquartz.ch/file/pdf/8607.pdf  bottom of page 2), it could 
be sigma-tau  6e-14  for Tau=3.0s-30s @ 5MHz...
Hope that helps,
Have a nice day,
Jean-Louis Oneto
- Original Message - 
From: [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Wednesday, October 29, 2008 5:07 PM
Subject: [time-nuts] What is opt 06 on BVA8600


 Hi;
 Anyone know what option 06 is on a Oscilloquartz 8600?
 Thanks;
 Thomas Knox






 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] 58532a ANTENNA CABLE?

[Jean-Louis Oneto]

I never heard a clam complain, so... ;-}
Jean-Louis Oneto

- Original Message - 
From: [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com
Sent: Thursday, March 27, 2008 10:53 PM
Subject: Re: [time-nuts] 58532a ANTENNA CABLE?


 Hi Jeff-

 I have only used SatStat with my Z3801A, and it did take a while to get it 
 set up right under XP.  I much prefer Tboltmon for the Thunderbolt.  Now 
 that both are functional, I can start playing with them.

 I found that the Z3801A with the std HP antenna and recommended cable 
 didn't work very well with the antenna in the garage (no plywood, 1x6s and 
 3 layers of asphalt shingles), it took forever to acquire sats and would 
 lose the lock at the drop of a hat.  It had to go out in the weather to be 
 stable.  On the other hand, the Thunderbolt antenna is in the corner of 
 the garage, tilted at an angle, with hanging bicycles on one side and 19 
 racks on another, and is happy as a clam.

 Are clams happy?  I've always wondered about that saying...

 -Dave

 -- Original message -- 
 From: jshank [EMAIL PROTECTED]

 There appears to be three software-monitoring programs available, GPSCon
 Pro, GPS Control  SatStat. I was just curious about what the group 
 thinks
 of these three programs or if there are any other available.



 The Z3801A manual suggest rg-213 of lmr-400. I have neither on hand but 
 am
 not apposed to purchasing either.

 I do have rg58/u and coax CATV cable on hand but the problem is that it 
 is a
 difficult process to run the cable from my basement lab to the second 
 floor
 attic and I only o want to do it once. Originally, I was going to 
 penetrate
 the roof at the ridgeline and install the antenna on a one foot but I
 understand it is possible to receive singles from under the 
 plywood/asphalt
 shingle roof. Is it worth a penetration of the roof?



 Jeff
 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.
 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] 5071A Assembly Level Service Manual for S/N Prefixes 3249A and US3930

[Jean-Louis Oneto]

); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY

Hi everybody,
I'm looking for the HP5071A (prefix 3249A) and Agilent 5071A (prefix US3930) 
Service Manuals. I have only found on the web (Symmetricom site) the manual 
for the prefix US4538 and above.
Thanks a lot in advance,
Jean-Louis Oneto
Grasse - France
e-mail: [EMAIL PROTECTED] 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] HP E1938 Web Page

[Jean-Louis Oneto]

); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY

Hi Didier,
I just put the file on your server under the name E1938_asdrawb.pdf. I can 
easily save it to other formats as well if anybody prefers.
Thanks for giving it a home...
Jean-Louis
- Original Message - 
From: Didier Juges [EMAIL PROTECTED]
To: 'Discussion of precise time and frequency measurement' 
time-nuts@febo.com
Sent: Wednesday, August 29, 2007 12:34 AM
Subject: Re: [time-nuts] HP E1938 Web Page


 ); SAEximRunCond expanded to false
 Errors-To: [EMAIL PROTECTED] RETRY

 Jean-Louis, you can upload it to my server

 http://www.ko4bb.com/ham_radio/Manuals

 Instructions are at the top of the page

 Merci d'avance,

 Didier KO4BB


 -Original Message-
 From: [EMAIL PROTECTED]
 [mailto:[EMAIL PROTECTED] On Behalf Of Jean-Louis Oneto
 Sent: Tuesday, August 28, 2007 4:03 PM
 To: Discussion of precise time and frequency measurement
 Subject: Re: [time-nuts] HP E1938 Web Page

 Hello all,
 I succeeded to read it with Corel PaintShopPro XI and then
 converted it to PDF with PDF Creator. The PDF file is 113kB
 but zip down to 96kB. Let me kow if you're interested, and
 where I can put it (I don't have a server available here).
 Have a nice day,
 Jean-Louis Oneto

 - Original Message -
 From: Brooke Clarke [EMAIL PROTECTED]
 To: Discussion of precise time and frequency measurement
 time-nuts@febo.com
 Sent: Tuesday, August 28, 2007 7:28 PM
 Subject: Re: [time-nuts] HP E1938 Web Page


  ); SAEximRunCond expanded to false
  Errors-To:
 [EMAIL PROTECTED] RETRY
 
  Hi Scott:
 
  Yes.  Can it be read?  How did you do it?
 
  Have Fun,
 
  Brooke Clarke
  http://www.PRC68.com
  http://www.precisionclock.com
 
 
 
  Scott Newell wrote:
  ); SAEximRunCond expanded to false
  Errors-To: [EMAIL PROTECTED] RETRY
 
  At 01:51 PM 8/28/2007 , Brooke Clarke wrote:
 
 ); SAEximRunCond expanded to false
 Errors-To: [EMAIL PROTECTED] RETRY
 
 Hi Scott:
 
 I have uploaded the smallest one E1938_asdrawb.hpg at:
 http://www.prc68.com/I/pdf/E1938_asdrawb.hpg
 
 
  Yep, HPGL.
 
  Want a pdf?
 
 
 
  ___
  time-nuts mailing list -- time-nuts@febo.com
  To unsubscribe, go to
  https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
  and follow the instructions there.


 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.


 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] WG: EZGPIB other software

[Jean-Louis Oneto]

); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY

Hello all,
I noticed that the garbled messages were encoded using UTF-8 (Unicode), and 
they also contained an Euro sign; often my mailer want to send mails 
containing Euros in Unicode, in spite that my default setting is ISO 8859-1 
(Latin-1).
May be a clue ??
Have a nice day/eve,
Jean-Louis Oneto
- Original Message - 
From: Ulrich Bangert [EMAIL PROTECTED]
To: 'Discussion of precise time and frequency measurement' 
time-nuts@febo.com
Sent: Tuesday, August 21, 2007 4:11 PM
Subject: Re: [time-nuts] WG: EZGPIB  other software


 ); SAEximRunCond expanded to false
 Errors-To: time-nuts-bounces+jean-louis.oneto
 Friends,

 my Outlook holds an option under International options that reads
 Codierung ausgehender Nachrichten automatisch wählen which means as
 much as Coding of outgoing mails is choosen automatically. I disabled
 that. Lets see it that works.

 Best regards
 Ulrich

 -Ursprüngliche Nachricht-
 Von: [EMAIL PROTECTED]
 [mailto:[EMAIL PROTECTED] Im Auftrag von Arnold Tibus
 Gesendet: Dienstag, 21. August 2007 17:53
 An: [EMAIL PROTECTED]; Discussion of precise time and
 frequency measurement
 Betreff: Re: [time-nuts] WG: EZGPIB  other software


 ); SAEximRunCond expanded to false
 Errors-To: [EMAIL PROTECTED] RETRY

 Daun and all,
 my mailer setting is set ISO 8859-1 (Latin-1) quoted
 printable, and I do not
 had and have problems with mails from Europe nor from USA,
 just very seldom with the special german characters (Umlaut)
 when the sender
 does use other and for me unknown settings.
 Perhaps it can help to find the reason for the problems.

 I hope it is in the sense of Ulrich, when I repeat his message:


 On Tue, 21 Aug 2007 14:48:45 +0200, Ulrich Bangert wrote:

  Hi folks,
 
  this is to inform you that
 
  a) a new version of EZGPIB is available from my homepage
 
  and
 
  b) I have come over an phantastic small LABVIEW clone by the
  name PROFILAB coming from an small German software company
  named ABACOM. I do not want to promise you too much but
  downloading the demo and playing around with it is MUCH FUN.
  I do not have any commercial interest in telling you. Its
  just that it needed only ten minutes of playing with the
  program to make sure that these were some of the best 99 Æ I
  ever spent on any software. The software is available in
  English language too.
 
  If interested look at
  http://www.abacom-online.de/uk/html/profilab-expert.html
 
 
  Cheers
 
  Ulrich Bangert
  www.ulrich-bangert.de
  Ortholzer Weg 1
  27243 Gross Ippener
 

 kind regards,

 Arnold


 On Tue, 21 Aug 2007 11:23:04 -0400, Daun Yeagley wrote:

 For me, all the messages were either scrambled or blank.  I
 never did figure out
 what Ulrich had to say!

 Daun





 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to
 https://www.febo.com/cgi- bin/mailman/listinfo/time-nuts
 and
 follow the instructions there.



 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to 
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there. 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Pendulums Atomic Clocks Gravity

[Jean-Louis Oneto]

Hi,
I think that on a satellite orbiting around the Earth, only the 
gravitational field of the Earth is zeroed, since it is equivalent to a 
freefall in the Earth gravitational field. The effects of all others 
perturbations are exactly the same (if you neglect the altitude of the 
satellite with respect to the Earth-Sun or Earth-Moon distances). Beside 
that, the Doppler effects (both classical and relativistic) are not 
negligible at all and are in fact corrected in GPS by offsets in the onboard 
clocks, steered to UTC(USNO).
Have a nice day,
Jean-Louis Oneto
OCA GEMINI - Avenue Copernic - 06130 Grasse - France
- Original Message - 
From: WB6BNQ [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com
Sent: Saturday, May 26, 2007 8:02 PM
Subject: Re: [time-nuts] Pendulums  Atomic Clocks  Gravity


 Brooke Clarke wrote:

 Gravity also effects atomic clocks, see: 
 http://www.leapsecond.com/great2005/
 and this puts a limit on what can be done with any atomic clock that's on
 Earth.  g will always have minor fluctuations (noise) due to all sorts 
 of
 things like the Sun, Moon, planets, asteroids, earthquakes, etc.  It's 
 still a
 direct g effect called red shift like (U2 â^' U1)/c2, where the Us are
 gravitational potentials, only smaller by c squared.

 If all of the above affects the gravitational action on the surface of the 
 Earth,
 then how is the statement, below, true ?

 I expect that in not too many years the official master clocks will no 
 longer
 be on Earth, but instead in satellites.  There g is precisely known to 
 be
 zero.  Since GPS satellites are excellent for time transfer that's where 
 they
 will be.  The ensemble will be the full constellation.

 It would seem that the satellite, which is just an arms throw from the 
 surface,
 would have the same affects acting upon it, albeit perhaps in modified 
 ways.  I
 would think the satellite would have to be placed at the center of the SUN 
 to have
 all of the effects (within our solar system) reduced to the smallest 
 amount.

 Can anyone elaborate on this ?  Thanks,

 Bill..WB6BNQ



 ___
 time-nuts mailing list
 time-nuts@febo.com
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts 


___
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] 5087A Distribution Amplifier

[Jean-Louis Oneto]

Hi Brian!
Last time I had this problem, it was the VERY BIG capacitor (1500MFD - 
40VDC) which measured as 21.8pF (yes PicoFarad!!!)
Jean-Louis Oneto
OCA GEMINI - Avenue Copernic - 06130 Grasse - France
Tel: (+33)[0]493.40.53.80, Fax: (+33)[0]493.40.53.33
e-mail: [EMAIL PROTECTED]
- Original Message - 
From: Brian Kirby [EMAIL PROTECTED]
To: Time Nuts time-nuts@febo.com
Sent: Wednesday, May 02, 2007 9:54 PM
Subject: [time-nuts] 5087A Distribution Amplifier


I bought an HP 5087A distribution amplifier off of ebay.  The unit is
 in good working condition.  Funny the power supply is putting out 120
 hertz square waves.which makes all the outputs look like they are
 oscillating garbagedisconnecting the power supply from the load does
 not change the situation.  I subbed a test power supply and the
 amplifiers work fine.

 Does anybody have the schematic to just the power supply and could I
 bother you to scan it and send to me, or a link to get it, or the manual ?

 The power supply looks very simple, but the schematic sure makes life
 easier !

 Thanks in advance - Brian N4FMN - [EMAIL PROTECTED]


 ___
 time-nuts mailing list
 time-nuts@febo.com
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts 


___
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Vendors of time sync hardware

[Jean-Louis Oneto]

Hello,
Have a look at:
http://tf.nist.gov/timefreq/general/receiverlist.htm
a similar list for software is at:
http://tf.nist.gov/timefreq/general/softwarelist.htm

Have a nice day,
Jean-Louis Oneto
e-mail: [EMAIL PROTECTED]
- Original Message - 
From: Jared Morrisen [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Wednesday, November 29, 2006 8:17 PM
Subject: [time-nuts] Vendors of time sync hardware


 Hola,
 
 
 
 For an RFP, I need 5 vendors of time sync hardware.
 
 
 
 I found the following:
 
 
 
 Spectracom - www.spectracomcorp.com
 
 Symmetricom - www.symmetricom.com
 
 EndRun Technologies - www.endruntechnologies.com
 
 
 
 Can anyone provide some others?
 
 Do you know of a full list of ntp based hardware devices?
 
 
 
 Thank you much,
 
 
 
 Jared
 ___
 time-nuts mailing list
 time-nuts@febo.com
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

___
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Chip-scale Atomic Clock !

[Jean-Louis Oneto]

Hello,
you will find a lots of details at:
http://tf.nist.gov/ofm/smallclock/index.htm
73,
Jean-Louis Oneto
OCA GEMINI - Avenue Copernic - 06130 Grasse - France
e-mail: [EMAIL PROTECTED]
- Original Message - 
From: Brooks Shera [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com
Sent: Wednesday, September 20, 2006 12:48 AM
Subject: [time-nuts] Chip-scale Atomic Clock !


 The excerpt  below from GPS World refers to a Chip-scale atomic clock 
 being developed by DARPA.

 Does anyone know what technology they might be using for such a clock?

 Atomic Clock Synchronization
 The U.S. Navy Space and Naval Warfare Systems Center San Diego is 
 incorporating a chip-scale atomic clock into a new GPS receiver design, 
 the Navigation Nugget. read more»The Nugget fuses a GPS software-defined 
 receiver with an inertial measurement unit (IMU), synchronized by an 
 onboard atomic clock, to create a positioning, navigation, and 
 timing-sensor suite capable of withstanding impaired and threatened GPS 
 environments. The chip-scale atomic clock is being developed by Defense 
 Advanced Research Projects Agency. Adding an atomic clock to the GPS/IMU 
 combination will help ground forces in canopy or jammed environments and 
 improve vertical accuracy. A large-scale prototype Navigation Nugget is 
 expected to be field tested in one year. Space and Naval Warfare Systems 
 Center, www.spawar.navy.mil/sandiego/.  



 -Brooks
 ___
 time-nuts mailing list
 time-nuts@febo.com
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts 


___
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

[time-nuts] schematics of the Trak 6490 microphase stepper

[Jean-Louis Oneto]

Hello,
I need the schematics of the Trak 6490 microphase stepper (should be pages 
FO-1 to FO-7 of Operating and Maintenance Manual) since I have the manual 
but the schematics are missing (I only have the power supply  schematic...)

Thanks a lot in advance,
Jean-Louis Oneto
OCA GEMINI


___
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts