Date: Thu, 9 Jul 2009 01:46:07 +1200
From: Steve Rooke sar10...@gmail.com
Subject: [time-nuts] GPS just got very accurate
Was just checking the GPS status page of my Truetime NTP
server and it reported Number of Satellites Tracked 892!
Quite apart from it only being able to track 8
Hi Dave,
I have a copy of MS Java but of course it only woks under Windows on
IE. This is not an ideal solution for me as I run Linux and only use
Firefox. If I access the servers web page with an browser running SUN
Java I get all sorts of errors so this is probably out. At the moment
I check
I have another reading key.
When the manufacturer publishes the specs of its crystals, it
alrady took into account all of the possible known variables,
some of them very tiny such as dependences on orientation
(which do exist), so freeing the assembler (and the end-user)
from caring of.
Hi Antonio,
Your probably right about the jump as has also been pointed out by
others. My initial reaction was to wonder what was going on here and
could not seem to attribute it to anything else.
Your welcome to my traces and it will be interesting to see if
anything does occur.
Cheers,
Steve
iov...@inwind.it wrote:
I have another reading key.
When the manufacturer publishes the specs of its crystals, it
alrady took into account all of the possible known variables,
some of them very tiny such as dependences on orientation
(which do exist), so freeing the assembler (and the
Hi again Steve...
I found this:-
http://www.tatanka.com.br/ies4linux/page/Main_Page
looking arround for any hints of IE and Linux.
I'm wondering if it's more a problem of no ActivX in FireFox on 'nix,
than any Java issue as such?
OK on the self contained NTP boxes appearing time to time (punn
Hal Murray wrote:
I've got an HP 5334B collecting data via a Prologix USB setup. It's been
running for months.
Mostly, it's doing what I expect. But then I got 2 glitches in the last two
days.
Here is a graph:
http://www.megapathdsl.net/~hmurray/time-nuts/Drift-ocxo3mhz-d.gif
Here is
Just found these on eBlag.
Way outside my price range, but...
220445049656 Not sure if it actualy does GPS disiplined stuff, as there is no
GPS antenna socket!
180370118043 Still too rich for me. And when you consider even a new NSLUG
is about £65, and the GPS is not an expensive item
I bought, but haven't received yet, one of the Datum LPRO units from eBay.
In trying to find information, I was able to locate some info on the
LPRO-101. However, looking at the picture on eBay, The model looks like
LPRO-FLX. Is this the same as the dash 101? Also, are these units nearing
the end
I have seen one instance where crystal orientation does matter. Among
other things, I'm interested in WW II military radios. Admittedly long
ago.
The Canadian Wireless Set 19, the standard radio for many tanks, etc., in
WW II had an external crystal calibrator. It put out 1 MHz, 100 KHz, and
10
Bob Camp wrote:
Hi
I think that if you dig into it, you will find that there is a polarized
light process to orient the blank before the base plate is applied.
Unfortunately for the discussion at hand, the direction of maximum G
sensitivity is still random relative to the mount.
Bob
On Thu, Jul 9, 2009 at 7:17 AM, Dave Baxterd...@uk-ar.co.uk wrote:
Just found these on eBlag.
Way outside my price range, but...
220445049656 Not sure if it actualy does GPS disiplined stuff, as there is
no GPS antenna socket!
180370118043 Still too rich for me. And when you consider
Richard (Rick) Karlquist wrote:
Bob Camp wrote:
Hi
I think that if you dig into it, you will find that there is a
polarized light process to orient the blank before the base plate is
applied.
Unfortunately for the discussion at hand, the direction of maximum G
sensitivity is still
Yes Chris, I did notice that. (red herring that is)
But I also do know that many people do indeed put various flavours of
Linux etc on the Slugs as they are known, for all sorts of odd
purposes. So (subject to enough memory) I suspect they could do the
job, somehow. What that was advertised
Some of the earlier Linksys WRTG routers are also popular targets for
home brewed Linux based appliances, and there is also a lot of
information about regarding hacking the hardware to include a real
serial port too. (Seems, the only parts missing are the RS232 line
drivers, and the 9way D
Also, are these units nearing the end of their expected lifetime?
I wanted something to use at work where it is difficult to put up a
GPS antenna.
They are telco gear so I would expect long life. But I assume the lamp will
wear out eventually.
If you are worried about a unit at work dying
Jim,
It is very much on topic!
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Palfreyman
Sent: 08 July 2009 23:37
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 10811 crystal
Agreed. Has anyone done the crucial experiment? establish stats, rotate
assembly, establish stats, etc? Should be able to measure at least if
there is an effect, and also if it is present, an approximate magnitude...
Don
Rob Kimberley
Jim,
It is very much on topic!
Rob Kimberley
Wonder too just how accurate it is, using a USB based (non PPS) GPS?
The picture looked like a GlobalSat BU-353. I guess you could build a NTP
server out one, but I wouldn't expect time-nuts quality.
I've been looking for low cost GPS units that work well with NTP. I haven't
found much.
Agreed. Has anyone done the crucial experiment? establish stats, rotate
assembly, establish stats, etc? Should be able to measure at least if
there is an effect, and also if it is present, an approximate magnitude...
Don
Hi Don,
There are two rather different topics here.
One is do crystal
Early WRT54G boxes had lots (relatively speaking) of RAM/ROM. To cut costs,
Linksys switched from Linux to ??? and reduced the RAM.
to VxWorks
Regards,
Javier
--
Javier HerreroEMAIL:
Some of the earlier Linksys WRTG routers are also popular targets for
home brewed Linux based appliances, and there is also a lot of
information about regarding hacking the hardware to include a real
serial port too. (Seems, the only parts missing are the RS232 line
drivers, and the 9way D
You are right, Tom, there are two mixed topics.
On the on-topic subject, instead of making tests to measure the frequency
dependence on orientation, It would be much more interesting looking at
possible ADEV dependences on orientation, particularily for small tau (the
bottom of the curve). I
iova...@inwind\.it wrote:
You are right, Tom, there are two mixed topics.
On the on-topic subject, instead of making tests to measure the frequency
dependence on orientation, It would be much more interesting looking at
possible ADEV dependences on orientation, particularily for small tau
Thanks. Tom. Glad to see the references.
I've some experience with clock time difference, as I showed an astonishing
number of years ago that the phase changes between two clocks as measured by
their respective LORAN-C signals was due to changes in the atmospheric index
of refraction for 100
Ah, never touch, bump, etc. implies that the effect of
changing the orientation of gravity is not reversible.
Or is it that returning to the original orientation undoes
the 10E9 effect but leaves a 10E12 permanent change?
I'd like to do the experiment myself, but I'm still getting
rid of stuff
Don Latham wrote:
Thanks. Tom. Glad to see the references.
I've some experience with clock time difference, as I showed an
astonishing number of years ago that the phase changes between two
clocks as measured by their respective LORAN-C signals was due to
changes in the atmospheric index of
iov...@inwind.it wrote:
You are right, Tom, there are two mixed topics.
On the on-topic subject, instead of making tests to measure the frequency
dependence on orientation, It would be much more interesting looking at
possible ADEV dependences on orientation, particularily for small tau (the
The Zhou paper should be taken with a grain of salt. It does report on a
number of deviations measured during eclipses. More investigations is
needed to characterize the cause of these deviations.
Agreed. It is not uncommon for well-done experiments to
spend more time on analysis of error
Hello Time-nuts,
Just wondering what the group concensus might be concerning maximizing Cs
tube life. On one extreme, if a tube is not used at all it will lose its
vacuum. That is why Symmetricom instructs that stored tubes be powered for
at least 30 minutes each 6 months. At the other
Many standards have a rear-panel jack for a dedicated ion-pump supply, which
can be left powered up 24/7. If you run the ion pump continuously, but not
the Cs oven, the tube will presumably last forever.
I added a switch to my 5062C that allows me to leave it plugged in with the
ion pump and
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