[time-nuts] Clock Project Help (Matt Boyer)

Matt Boyer mboyer at vistacominc.com
Thu Oct 29 12:21:31 UTC 2009


Check out the NTP clock kit from Tuxgraphics. 

http://tuxgraphics.org/electronics/200710/avr-ntp-clock.shtml 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of time-nuts-request at febo.com
Sent: Thursday, October 29, 2009 8:00 AM
To: time-nuts at febo.com
Subject: time-nuts Digest, Vol 63, Issue 106

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Today's Topics:

   1. Re: G P S D O (Ray Hudson)
   2. Re: Clock Project Help (Brent Gordon)
   3. Re: G P S D O (Javier Herrero)
   4. Solartron 7150+ filters (David C. Partridge)


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Message: 1
Date: Wed, 28 Oct 2009 21:10:19 -0700 (PDT)
From: Ray Hudson <hudsonray at yahoo.com.au>
Subject: Re: [time-nuts] G P S D O
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Message-ID: <464955.36303.qm at web65711.mail.ac4.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1


Brian use PDF999    http://www.pdf995.com/ its a printer driver that prints to PDF file. When installing it just untick all the other junk it wants to install. You get a few of ads when using it but its free otherwise.

Ray.

--- On Thu, 29/10/09, Brian Kirby <kilodelta4foxmike at gmail.com> wrote:

> From: Brian Kirby <kilodelta4foxmike at gmail.com>
> Subject: [time-nuts] G P S D O
> To: "precise time" <time-nuts at febo.com>
> Received: Thursday, 29 October, 2009, 2:32 PM
> I have attached a plots of various
> GPSDO's compared against a HP5065A rubidium.
> 
> The first plot is of a HP Z3801A.? The left scale
> spans 36 nanoseconds.
> 
> The second plot is of a Trimble Thunderbolt, its running
> default 100 second time constant with a 1.2 damping
> factor.? Its from the group purchase.? I changed
> the scale to span 36 nanoseconds.
> 
> The third plot is of Efratom FRS-C rubidium that is
> controlled by the Shera Controller, and its GPS source is an
> older Motorola Oncore VP, ver 10.? The scale
> spans???36 nanoseconds.? Bear in mind
> this was not his stock PIC, but a PIC that we modified for a
> rubidium.? His stock PIC had a update rate of 30
> seconds, we tested units at 60, 120 and 240 seconds and
> settled on 120 seconds after the preliminary
> data.???The time constant was set up for mode
> 7, I believe that works out to? the proportional
> controller time constant around 1/3 of a day? (I'll
> have to find the paperwork and run the calcs).
> 
> I tried to present some information earlier, but the only
> instrumentation I had was a HP 53131A, with TAC32, and a
> Efratom FRK-L for reference.? At that time I did not
> have the computing horsepower, plotting capability or some
> more serious instrumentation.
> 
> The instrumentation used in these plots was a HP 5370B, it
> baselines at 2x10-11 at one second and drops a magnitude for
> every decade in tau.? The recording was done via a
> Prologix GPIB USB adapter and HyperTerminal in
> Windows.? The plots were generate in DF6JB/Ulrich's
> Plotter program (thanks !).
> 
> After generating the plots, I scanned them into PDF at 200
> DPI to save bandwidth.? I have not been able to
> generate PDF's directly inside of Plotter.? I use
> version 6 of PDF and it takes an internal error.? AT
> the present, I cannot afford to upgrade it.
> 
> I bought a Fury controller a couple of years back and due
> to personal issues I could not put it to use.? My next
> project it to put the Fury on the FRS-C and see how much we
> can smooth it out....
> 
> Brian KD4FM
> 
> -----Inline Attachment Follows-----
> 
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Message: 2
Date: Wed, 28 Oct 2009 22:27:55 -0600
From: Brent Gordon <time-nuts at adobe-labs.com>
Subject: Re: [time-nuts] Clock Project Help
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Message-ID: <4AE919CB.9090909 at adobe-labs.com>
Content-Type: text/plain; charset="ISO-8859-1"

   There is an article in Circuit Cellar magazine that you need to read.
   It is Time Server Design:  Synchronize with the WWVB Time Code.  It is
   in the Nov 2008 issue (#220).  You can buy the article at
   [1]http://www.circuitcellar.com/magazine/220.html for $1.50.  Although
   it is the opposite of what you want to do (it acts as an NTP server),
   the article has lots of useful information.
   I vaguely recall that they also had an article very close to what you
   want, possibly in 2007.  If I remember correctly it was a combination
   alarm clock/MP3 player that got the time using NTP.  If it wasn't in
   Circuit Cellar then it was in Nuts & Volts magazine
   [2]http://www.nutsvolts.com/ .  Nuts and Volts is more beginner
   oriented than Circuit Cellar.
   If you want a microcontroller with an OLED display look at Luminary
   Micro Stellaris LM3S811 Evaluation Kit
   [3]http://www.luminarymicro.com/products/stellaris_811_evaluation_kits.
   html .  You can get them from Digi-Key for $49.  It doesn't have
   ethernet but it does have USB.  Add one of the internet-on-a-chip
   boards from Microchip or Wiznet and you're done.
   I just found out Circuit Cellar is sponsoring a contest with $15000
   total prize money for cool designs using the Wiznet W7100.  You can get
   an eval board with LCD display for $49.  I think it would be ideal for
   your project.
   [4]http://www.circuitcellar.com/newsletter/1009.htm
   I'm not affiliated with Circuit Cellar in any way other than as a
   subscriber.  Most of what I know about embedded systems I learned from
   reading the magazine.  They even have Time Nuts related articles:
   Microcontroller Clock-Locking:  Frequency Reference Synchronization in
   the Jan 2009 (#222).
   Brent

References

   1. http://www.circuitcellar.com/magazine/220.html
   2. http://www.nutsvolts.com/
   3. http://www.luminarymicro.com/products/stellaris_811_evaluation_kits.html
   4. http://www.circuitcellar.com/newsletter/1009.htm


------------------------------

Message: 3
Date: Thu, 29 Oct 2009 08:06:20 +0100
From: Javier Herrero <jherrero at hvsistemas.es>
Subject: Re: [time-nuts] G P S D O
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Message-ID: <4AE93EEC.9080708 at hvsistemas.es>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I prefer PDFcreator http://sourceforge.net/projects/pdfcreator/

Free without ads, and as far as I remember, better than PDF995 :)

Regards,

Javier

Ray Hudson escribi?:
> Brian use PDF999    http://www.pdf995.com/ its a printer driver that prints to PDF file. When installing it just untick all the other junk it wants to install. You get a few of ads when using it but its free otherwise.
>
> Ray.
>

-- 
------------------------------------------------------------------------
Javier Herrero                            EMAIL: jherrero at hvsistemas.com
HV Sistemas S.L.                          PHONE:         +34 949 336 806
Los Charcones, 17A                        FAX:           +34 949 336 792
19170 El Casar - Guadalajara - Spain      WEB: http://www.hvsistemas.com




------------------------------

Message: 4
Date: Thu, 29 Oct 2009 10:47:46 -0000
From: "David C. Partridge" <david.partridge at dsl.pipex.com>
Subject: [time-nuts] Solartron 7150+ filters
To: "'Discussion of precise time and frequency measurement'"
	<time-nuts at febo.com>
Message-ID: <54B8BB1F521540FD9967C72A7EFC5C54 at APOLLO>
Content-Type: text/plain;	charset="us-ascii"

Ian,

If you have time/inclination, I'd be interested to see pics of your
dissassembly/reassembly process.

Dave
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of gonzo moto
Sent: 28 October 2009 18:11
To: time-nuts
Subject: Re: [time-nuts] time-nuts Digest, Vol 63, Issue 101
I hear you David!

I thought I'd start on the working filter and the repair the smoked unit
when I know what I'm doing.

I've burrowed inside the filter and was surprised to find the filter caps
(WIMA MP3-E) are only rated for 250V.
The MP3-E is a discontinued line (read: I can't find a datasheet).
These might be ok for European 220V, but my UPS shows my line voltage to
average 243V, with regular excursions over 250V.
These caps may be good, but I'd like to see a bit more margin there (it'll
be going back together with MP3-X2/275V caps).

Robert, while it's not that I don't value my time, my workmanship is up to
the task, and I'm reluctant to replace a component (possibly with one no
better than the failed part) when I can fix it better than it was in the
first place. 

ian
 		 	   		  
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