Le 18/01/2011 05:07, J. L. Trantham a écrit :
An unrelated question. My Z3816A reports GPS time. I have looked but have
not found a command to make it switch to UTC. Does such a command exist?
If so, what is it?
The command to do the same on the Z3801A might work with this box aswell.
Dear Warren and Mark,
I have hacked together a very simple setup with the transistor circuit
and the opened Thunderbolt case (not its own case, but the front lid of
my outer case opened). The CPU fan was placed about 2 away, only
blowing indirectly into the case..
The results are simply
Achim, DH2VA
AFTER temperature is being controlled pretty good with the default settings
(modified if necessary),
What I use to fine tune the PID values is the Quick Auto Tune command
K,A,4,Enter.
The quick command is much faster (typ 30 min) than the full Auto Tune
command, and can and
You can specify the com port number on the command line. COM2 would use the /2
parameter, etc
If you type in ? from the keyboard or /? on the command line you get a dialog
box that shows most of the command line options.
-
Is there a way to make Lady Heather 'wake up'
Generally you have to do some playing with the fan position and internal
baffling and thermal mass for best performance of the temperature controller.
You don't want direct airflow onto the tbolt. Also you probably don't want an
large/aggressive fan... a little airflow can go a long way.
Michael,
Thanks for the hint. I've looked at that site a thousand times but never
found that hint until now. I'll give it a try.
Thanks again.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of cook michael
Sent: Tuesday, January
Mark,
That is what I understood from the 'Readme' but I could not get the program
to respond until after it had recognized the TBolt which required me to put
the TBolt on COM 1 to start with.
Thanks,
Joe
-Original Message-
From: time-nuts-boun...@febo.com
Looking at ways to optimize GPS-Rb-OCXO performance, using dewar, foam and
fan cooling, using a fan was an eye opener. I have now come to the
conclusion that for the temperature environment we are working in, a fan is
the
best way for all three. I am using a 5X5X1 cm fan drawing 50 mA at 12
The Z3816A responded to the command nicely. I was also able to use the
command:
*tst?
to reboot the receiver without having to turn off the Z3816A. This was
using Symmetricom SatStat v5.0. I have not tried with HP SatStat v4.2.
Initially, the time was off by what appeared to be the
Though this could be of interest...
http://www.insidegnss.com/node/2446
Cheers
P.
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On 19/01/11 02:35, Pierpaolo Bernardi wrote:
Though this could be of interest...
http://www.insidegnss.com/node/2446
The SA.45s reportedly provides ... short-term stability (Allan
Deviation) of 2E-10 @ 1 sec, long-term aging of 3E-10/month
From the data sheet of the bigger Rubidium
On Tue, Jan 18, 2011 at 17:04, Julien Goodwin
time-n...@studio442.com.au wrote:
On 19/01/11 02:35, Pierpaolo Bernardi wrote:
Though this could be of interest...
http://www.insidegnss.com/node/2446
The SA.45s reportedly provides ... short-term stability (Allan
Deviation) of 2E-10 @ 1 sec,
Wonder what the lifetime is?
Surely for time nuts they will have a special deal. Like $199 for today
only.
Well we might dream.
On Tue, Jan 18, 2011 at 11:20 AM, Pierpaolo Bernardi olopie...@gmail.comwrote:
On Tue, Jan 18, 2011 at 17:04, Julien Goodwin
time-n...@studio442.com.au wrote:
On
On Tue, Jan 18, 2011 at 8:20 AM, Pierpaolo Bernardi olopie...@gmail.com wrote:
On Tue, Jan 18, 2011 at 17:04, Julien Goodwin
time-n...@studio442.com.au wrote:
On 19/01/11 02:35, Pierpaolo Bernardi wrote:
Though this could be of interest...
http://www.insidegnss.com/node/2446
The SA.45s
Been getting ready to build a box for the t'bolt and instead of it all
getting hotter to maintain a stable temp
is the idea of cooling with a Peltier cooler, or a mix of a Peltier
and a heater ?
Extending life time is the major concern
-pete
___
Hi
If you had one delivered to your door today, what on your bench would you
replace with it?
A lot of what it does is not as good as a $30 e-place DOCXO. Other than
power / weight / size, you can significantly beat it today with a sub $100
Rb from the same sources. For stationary time nut in
Hi
There's pretty much nothing in a TBolt that wears out. The heat rise on the
parts on the pc board is modest and the only heated part is the OCXO.
Cooling down the OCXO actually increases the stress on it (more heater power
pulled = more stress on the heater).
Obviously you can get it to hot.
Hi
If you are going to use a fan, I would seal up the part nice and tight. Very
small drafts could have pretty major effects on gradients inside the gizmo.
Simple fiddling with aluminum tape should do the trick pretty well. A roll
of the stuff from Home Depot will last you forever...
Bob
Book seems a rather lite on actually getting Python to work with GPIB.
Instead it really a book on data manipulation using Python
Lester B Veenstra MØYCM K1YCM
les...@veenstras.com
m0...@veenstras.com
k1...@veenstras.com
US Postal Address:
PSC 45 Box 781
APO AE 09468 USA
UK Postal Address:
http://www.pddnet.com/news-ap-german-firms-ceo-removed-over-wikileaks-cable-011811/?et_cid=991385et_rid=45624211linkid=http%3a%2f%2fwww.pddnet.com%2fnews-ap-german-firms-ceo-removed-over-wikileaks-cable-011811%2f
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On Tue, Jan 18, 2011 at 9:16 AM, Pete Lancashire
p...@petelancashire.com wrote:
Been getting ready to build a box for the t'bolt and instead of it all
getting hotter to maintain a stable temp
is the idea of cooling with a Peltier cooler, or a mix of a Peltier
I've used Peltier cooling. It
sound like not worth it. My idea of 'cooling' was say keeping the insides
at something like 25C. Just having a 2nd TBolt as a spare would be easier
-pete
On Tue, Jan 18, 2011 at 9:41 AM, Bob Camp li...@rtty.us wrote:
Hi
There's pretty much nothing in a TBolt that wears out. The heat rise on
I've done a couple projects/contracts with them, still have a few
dozen units, power supplies,
heat pipes etc.
but I've ditched the idea. Spare T'Bolt or two should exceed my life.
-pete
On Tue, Jan 18, 2011 at 10:12 AM, Chris Albertson
albertson.ch...@gmail.com wrote:
On Tue, Jan 18, 2011 at
In message aanlktikoyojc5tg_x4y_wsttznxgktwf8ikmxu43k...@mail.gmail.com, Pete
Lancashire writes:
The long term aging spec is interesting to me, as a cesium physics package is a
primary standard wouldn't there be an ultimate limit to the total long term
aging ? (I took a quick glance at the full data sheet and didn't see any
reference to this.)
- Original Message
From: Julien
The comment about Galileo mainly being for the benefit of
France reminds me of the old joke about the French acronym
SECAM standing for System Engineered Contrary to American Methods.
Rick
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To
In message 848524.71272...@web38803.mail.mud.yahoo.com, Mark Spencer writes:
Don't overlook the start-up time: 2 minutes, that's pretty darn good...
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since
The 1 pps input for disciplining and the RS 232 control capability is also
interesting.
- Original Message
From: Poul-Henning Kamp p...@phk.freebsd.dk
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Tue, January 18, 2011 11:03:07 AM
Subject: Re:
Peltier takes to much power and generates more heat. A fan will work
nicely.
Bert Kehren
In a message dated 1/18/2011 12:17:00 P.M. Eastern Standard Time,
p...@petelancashire.com writes:
Been getting ready to build a box for the t'bolt and instead of it all
getting hotter to maintain a
Rick,
Maybe the French had a point... we all know NTSC stands for 'Never Twice
Same Colour'!
Regards,
Murray Greenman
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and
Hi Mark:
I got the idea that it's a Rubidium clock.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Mark Spencer wrote:
The long term aging spec is interesting to me, as a cesium physics package is a
primary standard wouldn't there be an ultimate limit to the total long term
aging ? (I took a
Looks familiar Said. Regards - Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of saidj...@aol.com
Sent: Tuesday, January 18, 2011 2:37
Strangely, the article from the original email in this thread
http://www.insidegnss.com/node/2446#Baseband_Technologies_Inc_
mentions the useage of cesium atoms in a resonance cell. The data sheet does
not mention cesium (at least from what I can see.)
- Original Message
Hi Mark:
That press release says something like Cesium like performance.
But the diagram of the unit looks like a Rb standard.
That's to say they are shining light through a heated cell.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Mark Spencer wrote:
Strangely, the article from the
In message 4d35ef76.7020...@pacific.net, Brooke Clarke writes:
The research that was announced some years ago was Cs atoms:
http://physicsworld.com/cws/article/news/20177
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD
Le 18/01/2011 20:59, Poul-Henning Kamp a écrit :
In message4d35ef76.7020...@pacific.net, Brooke Clarke writes:
The research that was announced some years ago was Cs atoms:
http://physicsworld.com/cws/article/news/20177
There is a technology pdf available on their site. It gives more
Quick question is this a rb reference.
Looked at the symetricom site they never actually say or I missed it.
On Tue, Jan 18, 2011 at 2:37 PM, saidj...@aol.com wrote:
Here is a link to the press release with more technical details and
pictures:
_
Hi all. I've grown interested in precise timekeeping so I decided to
buy an inexpensive Transystem iBlue 737 GPSr clone with MTK 3301 +
3179 chipset (32-channel, -158dBm tracking sensitivity, Silicon Wave
Bluetooth 1.2 chipset) for use with my Fedora 12 Linux Netbook (An
Acer Aspire One D150).
You'll probably get better (and more interesting!) answers on the NTP
group/mailing list, but a first thought is that NTP takes quite a long
time to stabilize after startup.
From the jitter value below being larger than the offset, I'm guessing
you took this ntpq snapshot after only a few
Some thoughts..
1) Can you really even expect 1uS timing with a BlueTooth GPS that
lacks a direct, wired 1PPS interface? My guess is no.
2) Next, add some pool servers to the ntp.conf file and let ntp get
your computer clock's rate of advance in the ball park As is
drift and offset are being
Quoting from a white paper on their site:
it uses a tiny hollowed-out silicon cube filled with cesium gas.
On 01/18/11 20:17, paul swed wrote:
Quick question is this a rb reference.
Looked at the symetricom site they never actually say or I missed it.
On Tue, Jan 18, 2011 at 2:37
To the list,
If you listen carefully to the Symmetricom slide show, particularly page 3, it
will tell you all you need to
know:
http://www.brainshark.com/Steve_FatSymmetricom/vu?pi=691826191dm=5pause=1appKey=77
You will discover that that it is indeed a Cesium operated device. HOWEVER !
It
Hi
Simply having cesium in it does not make it a primary standard. Since it's
more like a rubidium than anything else, it's a lot easier to think of it as
a really small low power rubidium. One other advantage it may have is that
the LED may have a longer life than a normal light bulb source. I
A quick question
I thought lady heather was a Tbolt program only.
Does it work with other GPSDP like the hp 3801 etc???
Thanks
On Tue, Jan 18, 2011 at 9:20 AM, J. L. Trantham jlt...@att.net wrote:
The Z3816A responded to the command nicely. I was also able to use the
command:
*tst?
Oh gosh, it would never, EVER do to find a li'l bitty product that performs
as well as our big ole spare rooms full of costly, bulky, heavy, mostly
antiquated equipment. [?]
On Tue, Jan 18, 2011 at 5:10 PM, Bob Camp li...@rtty.us wrote:
Hi
Simply having cesium in it does not make it a
No, not at this time. It would take a lot of hacking.
-- john, KE5FX
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]On
Behalf Of paul swed
Sent: Tuesday, January 18, 2011 2:18 PM
To: Discussion of precise time and frequency measurement
Hi
In this case, it's an itty bitty gizmo that has some significant compromises in
performance compared to it's bigger cousins.
Bob
On Jan 18, 2011, at 5:47 PM, William H. Fite wrote:
Oh gosh, it would never, EVER do to find a li'l bitty product that performs
as well as our big ole spare
Hi,
A couple of things not mentioned in the previous responses:
precision here is not how accurate your laptops clock is.
precision is a measure of how much the time changes during successive
reading of the system clock as viewed by ntpd. Its minimum value is 1us
due to the timeval
tnx
On Tue, Jan 18, 2011 at 5:49 PM, John Miles jmi...@pop.net wrote:
No, not at this time. It would take a lot of hacking.
-- john, KE5FX
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]On
Behalf Of paul swed
Sent: Tuesday, January 18,
Hi Tom,
Well, the phase noise is not as good as other Rb sources that can be
had for around $100 that are not much bigger in size. For example the
FE-5650A or even the FE5680A Rb's.
Would it be useful ? That depends upon your operating requirements.
For wide band FM at 10 GHz
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]On
Behalf Of Tom Holmes
Sent: Tuesday, January 18, 2011 4:43 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit
Hi
Using this directly at microwave - not a real good idea. Using it to drive a
100 MHz phase locked low noise VCXO through a very narrow loop and then taking
that on up to microwave - should work pretty well. The only gotcha would be if
they are into PSK-32 at 24 GHz and don't like to tune
Thanks for all the info.
I wasn't aware that leapsecond did any testing on the unit.
Now I gotta play more with it.
Rix Seacord K2AVP
Right, I ordered one too when the thread started in November.
I just updated the lab report page to include 1PPS risetime
and TTL/RS232 NMEA latency/jitter
I am only using LH with the TBolt. I also run a Z3816A simultaneously to
cross check frequencies to make sure I am not using a 'dead' reference. I
monitor both on the same computer that has two serial ports and runs
Win2KPro. I had previously used TBoltMon but decided to give LH a try.
Quite
Don't overlook the fact that it also puts out a square wave signal. Great
for a digital clock pulse, but for a clean radio reference you also have to
remember the nature of a square wave - it is an infinite number of odd
harmonics. There's a lot of built in jitter. You'd need to filter the heck
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