I know a number of you have been waiting for the results of
this M12 experiment. I compared the performance of a 100 Hz
output vs. a 1PPS output vs. a 1PPS with sawtooth correction.
http://www.leapsecond.com/pages/m12-adev/
I think it came out quite well and it may surprise some of you.
/tvb
Tom,
Interesting results - thank you. Is there a small problem with the graph
plotting routine though? On the left of the 100Hz
plots, at some tau there are two points above each other (5 + 7 * 10^-2), and
other tau have no data points (4, 6, + 8 * 10^-
2).
Peter
On Fri Dec 5 8:32 ,
Nice and useful
What about Jupiter's 10 KHz output under same conditions?
Predrag Dukic
At 09:32 5.12.2008, you wrote:
I know a number of you have been waiting for the results of
this M12 experiment. I compared the performance of a 100 Hz
output vs. a 1PPS output vs. a 1PPS with
/tvb
Nice work, I was afraid you had dropped the subject.
There is a chance that the Allen noise ripple using the 100Hz can be reduced or
eliminated
if you have a processor in the system.
The short of it is that every once in a while the 100 Hz syncs up for a short
time to the 1 Hz
which
Bruce
asked)
Doesn't this phase detector, like all digital phase detectors, have
significant non linearity at the ends of its range?
In the case of an XOR gate phase detector this is caused by the finite
slew rate of the gate output.
Thanks for all the ideas and Information.
True, XORs don't
On Sun, 23 Nov 2008 20:26:52 -0800, Lux, James P [EMAIL PROTECTED]
wrote:
There's a fair amount of F/OSS software from JPL available to do this sort of
calibration. It's used to calibrate cameras used on Mars rovers, among other
things. The target pattern for calibration is a bunch of big
In message [EMAIL PROTECTED], WarrenS writes:
The short of it is that every once in a while the 100 Hz syncs up
for a short time to the 1 Hz
As far as I have ever been able to tell, that is not how it
works.
The 100Hz and 1Hz are generated with the same hardware and same
behaviour relative to
On Mon, 24 Nov 2008 17:33:25 -0800, Tom Van Baak [EMAIL PROTECTED] wrote:
Yes. I know of several commecial systems. If you only need to do a short
jump, then using fairly basic E/O-O/E equipment should work well
enought. It all depends if you want/can to roll your own or need to buy
a
In message 02c801c956c9$4aa089a0$6401a8c0 at WSOffice, WarrenS writes:
The short of it is that every once in a while the 100 Hz syncs up
for a short time to the 1 Hz
As far as I have ever been able to tell, that is not how it
works.
The 100Hz and 1Hz are generated with the same hardware and
It's actually [1]http://www.bb-elec.com for those looking.
Bill Ezell
--
They said 'Windows or better'
so I used Linux.
Neon John wrote:
On Mon, 24 Nov 2008 17:33:25 -0800, Tom Van Baak [2][EMAIL PROTECTED] wrot
e:
Yes. I know of several commecial systems. If you only need to
It's regular Heliax that's been temperature-conditioned by repeated
temp cycling to minimize dielectric size change vs temperature. This
minimizes phase shift over length. The cycling affects the foam used
as the dielectric, which apparently eventually stops expanding and
In message [EMAIL PROTECTED], WarrenS writes:
The short of it is that every once in a while the 100 Hz syncs up
for a short time to the 1 Hz
As far as I have ever been able to tell, that is not how it
works.
The 100 Hz is defiantly update or at least different on every cycle,
and has about the
In message [EMAIL PROTECTED], Poul-Henning Kamp writes:
We are talking about different things here, you are talking about
collapsing the chosen (software) frequency (estimate) to phase
samples using the hardware, I'm talking about updates to the
(software) frequency (estimate).
Forgot to say: if
Dear All,
A couple of weeks ago I send a request to the list for a HP 1600A logic
analyzer manual. Hans Agema was kind enough to send his manual to me for
scanning. I made a scan of the manual, which is now available to the
whole group through Didiers website (www.ko4bb.com). Check the
Warren
Bruce
asked)
Doesn't this phase detector, like all digital phase detectors, have
significant non linearity at the ends of its range?
In the case of an XOR gate phase detector this is caused by the finite
slew rate of the gate output.
Thanks for all the ideas and Information.
pablo alvarez wrote:
Hi,
Perhaps the most apropiate solution for the time-nuts world is to use
an standard development kit and add a custom mezzanine with the extra
required logic.
Unfortunately the one I have in my lab is based on a Virtex5 fpga
which is rather expensive, but one can find
Rick Harold wrote:
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
On 12/5/08 3:32 AM, Neon John [EMAIL PROTECTED] wrote:
On Sun, 23 Nov 2008 20:26:52 -0800, Lux, James P [EMAIL PROTECTED]
wrote:
There's a fair amount of F/OSS software from JPL available to do this sort of
calibration. It's used to calibrate cameras used on Mars rovers, among other
On 12/5/08 3:48 AM, Neon John [EMAIL PROTECTED] wrote:
On Mon, 24 Nov 2008 17:33:25 -0800, Tom Van Baak [EMAIL PROTECTED] wrote:
Yes. I know of several commecial systems. If you only need to do a short
jump, then using fairly basic E/O-O/E equipment should work well
enought. It all
Bruce,
I just wanted to thank you for the interesting information. I
grabbed a few other electronics related files that I saw on your FTP
site. Much appreciated!
Regards,
Brad
At 10:31 PM 12/2/2008, you wrote:
Fellow clock-tickers,
The manual may be found on the Blue Feather
Tom,
I've sent you a couple of messages off-list. I suspect they are caught
in your spam filters somewhere. I am interested in the next group
buy of TBolts.
I think we'll do one more group buy next month and then I'm
done with this project. At that time I'll also announce the plans
for all
Hi all,
Last month's lot of 100 Thunderbolts sold out in a day or two.
The status is that more than half have been shipped so far; the
rest within a few weeks. Thank you all for your patience.
That was the 4th large batch of Thunderbolts that I was able to
obtain, test,
Hi Tom,
I also sent you an email off-list, requesting two TBolts, but I have
not received a reply. I'd like to prepay so I don't lose out due to
transfer of funds from Canada like the last time.
Please let me know if this is possible.
Thanks,
Best Regards,
Mike Monett
Fri, 5 Dec 2008 09:31:50 -0800
From: Tom Van Baak [EMAIL PROTECTED]
Subject: Re: [time-nuts] Thunderbolt time-nuts/TAPR Group Buy - status
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Message-ID: [EMAIL PROTECTED]
Content-Type: text/plain; format=flowed;
Sorry to jump in here so late in the discussion thread.
Have you considered a laser interferometer (which is an accepted primary
standard for measuring displacement). Over the distance you want to measure
you'll get much better than 1 mm accuracy (closer to 1 micron actually,
assuming you
On Fri, 2008-12-05 at 09:49 -0800, WarrenS wrote:
The way you are describing doing it may have one additional BIG problem you
may not of addressed.
The antennas must be smaller than 1mm or at least be stable in effective
position to that accuracy.
Good geodetic quality GPS antennas have
Greetings again fellow listers - I have been trying to build a voltage
multiplier to replace what I believe to be a dead one in my 5062C ion
pump power supply. I downloaded the 5061service manual (thanks
Leapsecond!!), and it states that it is a doubler in that power supply.
I long ago got
Tim Schulz wrote:
Greetings again fellow listers - I have been trying to build a voltage
multiplier to replace what I believe to be a dead one in my 5062C ion
pump power supply. I downloaded the 5061service manual (thanks
Leapsecond!!), and it states that it is a doubler in that power
WarrenS wrote:
Bruce
asked)
Doesn't this phase detector, like all digital phase detectors, have
significant non linearity at the ends of its range?
In the case of an XOR gate phase detector this is caused by the finite
slew rate of the gate output.
Thanks for all the ideas and
Warren
Another potential issue is crosstalk between flipflops in the same
package, in particular between the 2 clock signals.
Such effects will not be evident when using a single clock source to
evaluate the system noise.
Using fully differential logic such as ECL will reduce such
Warren
Another potential issue is crosstalk between flipflops in the same
package, in particular between the 2 clock signals.
Such effects will not be evident when using a single clock source to
evaluate the system noise.
Using fully differential logic such as ECL will reduce such coupling at
Bruce
Thanks, for pointing out my FF mistake. I do know that at this level of
resolution
you can not have two edges that are close together in the same AIR Space,
let alone the same IC without some interaction.I would not put them on the same
PCB or PS
when checking what the best possible
WarrenS wrote:
Bruce
Thanks, for pointing out my FF mistake. I do know that at this level of
resolution
you can not have two edges that are close together in the same AIR Space,
let alone the same IC without some interaction.I would not put them on the
same PCB or PS
when checking what
To Björn
wow, neat, mm accurate antennas,
That means the RF way still has some hope.
How does it get the information down the cable without unacceptable loss of
accuracy?
Anyone know how they make these antennas, and can it be done with small cheapy
ones?
To Rick:
I guess Rick, you now
On 12/5/08 8:55 PM, WarrenS [EMAIL PROTECTED] wrote:
To Björn
wow, neat, mm accurate antennas,
That means the RF way still has some hope.
How does it get the information down the cable without unacceptable loss of
accuracy?
Anyone know how they make these antennas, and can it be
James
Question
So if the antenna is rotated in any and all of its axes, it does not should
like from what you are saying there is really just a single point in it like
you get for say 'center of mass'. that stays at a known spot.
It sounds more like a bunch of calibration points than a single
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