Anyone know what bit 11 (0x0800) of the Thunderbolt's minor alarm field
is? My documentation stops at bit 8 (test mode).
Thanks,
-JP
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It's not generated from a DDS. It's from a xilinx PLD,
I think the DDS is implemented inside the PLD.
Sying that is not a DDS, it's a PLD, is like saying That is not an
amplifier, it is a transistor.
But a DDS would require a DAC somewhere. Here, I see can see the trace
from the PLD pin, to
The DDs is part of the Rb loop, the PLD divides by 3 and 2, the 10 MHz is a
direct function of the XTAL. I am sure the PLD also has other functions.
Older models had a 50.255 XTAL with a DDS on the output, I think the change
occurred some time between 2000 and 2002.
Bert Kehren
In a
Hello,
El 16/11/2011 07:22, Sylvain Munaut escribió:
But a DDS would require a DAC somewhere. Here, I see can see the trace
from the PLD pin, to the LC filter to the RF connector ... and I
probed the PLD output, it's a square wave.
A good DDS does, but (as was discussed here some time ago)
Hi Nigel,
I'm very interested. At £50 for the lot, it sounds a good deal.
Let me know ASAP.
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of gandal...@aol.com
Sent: 16 November 2011 01:02
To: time-nuts@febo.com
Subject: [time-nuts]
Hello,
A paper about has been published, entitled Relativity accommodates
superluminal mean velocities. According to the author, the surprise is
not that the mean velocity measured for the neutrinos by the OPERA team
is is greater than c, but the exceeding amount.
Contrarily to a widespread
Folks,
Is it my imagination or is the iPhone under IOS 5 keeping way better time?
I assume it's contacting the mobile towers more often for reading time.
Jim Palfreymam
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On 16 November 2011 12:27, Jim Palfreyman jim77...@gmail.com wrote:
Folks,
Is it my imagination or is the iPhone under IOS 5 keeping way better time?
Mine (3 GS running 5.0.1) is apparently within 1 second of UTC which is
good.
By the way... is it possible to build a custom receiver to send
Folks,
Is it my imagination or is the iPhone under IOS 5 keeping way better
time?
I assume it's contacting the mobile towers more often for reading time.
Jim Palfreymam
Lucky Jim!
Certainly doesn't apply to my iPad2. Currently 40.8 seconds out under
5.0.1. Sinful it doesn't use NTP ( I
Hi All
The TR5821 counters have now been sold, many thanks to all who showed an
interest.
Watch this space, more to follow.
Regards
Nigel
GM8PZR
In a message dated 16/11/2011 01:03:06 GMT Standard Time, gandal...@aol.com
writes:
This first offer is for five Takeda Riken TR5821
On 16 November 2011 12:47, David J Taylor david-tay...@blueyonder.co.ukwrote:
Folks,
Is it my imagination or is the iPhone under IOS 5 keeping way better time?
I assume it's contacting the mobile towers more often for reading time.
Jim Palfreymam
Lucky Jim!
Certainly doesn't apply to
I own a Mac Mini and a MacBook. Their NTP implementation is simply a
joke.
Even with a local stratum 1 I can't get decent accuracy. :-(
David, weren't you interested in a LED clock I was going to build?
Cheers,
Miguel
A pity that there isn't a port of the reference NTP for the Mac, such as
I use an app. that is called Emerald Sequoia that pings Internet time servers
and I find my iPhone 4 with IOS 5 is
off by about 1-2 seconds.
Cheers
Raj
Folks,
Is it my imagination or is the iPhone under IOS 5 keeping way better time?
I assume it's contacting the mobile towers more often
At 07:27 AM 11/16/2011, Jim Palfreyman wrote...
Is it my imagination or is the iPhone under IOS 5 keeping way better
time?
I assume it's contacting the mobile towers more often for reading
time.
My Android phone is consistently 1 second behind GPS (CDMA network)
time. That is, it's 14
At 10:03 AM 11/16/2011, David J Taylor wrote...
A pity that there isn't a port of the reference NTP for the Mac, such
as we have on Windows.
macmini-2:~ mikes# ntpd --version
ntpd - NTP daemon program - Ver. 4.2.4p4
Seems to be the standard implementation. Works fine for me.
Yes, Miguel, someone did mention an NTP synched clock some time back,
and
I thought it might be a fun project. Based on an Arduino board IIRC?
Although I don't think it had Wi-Fi by default
I have it running at the moment. Have to build a case tough. See
attached
picture.
It looks
Hi David!
On 16 November 2011 16:18, David J Taylor david-tay...@blueyonder.co.ukwrote:
Yes, Miguel, someone did mention an NTP synched clock some time back, and
I thought it might be a fun project. Based on an Arduino board IIRC?
Although I don't think it had Wi-Fi by default
I
Miguel Gonçalves m...@miguelgoncalves.com wrote:
On 16 November 2011 12:47, David J Taylor
david-tay...@blueyonder.co.ukwrote:
Certainly doesn't apply to my iPad2. Currently 40.8 seconds out under
5.0.1. Sinful it doesn't use NTP ( I suppose you know who didn't approve
of NTP, since
I found a use for the GPIB interface on my counter - record
the frequency drift of its internal timebase during warm up.
It looks like an oven warming up. I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has
On Wed, Nov 16, 2011 at 7:03 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
A pity that there isn't a port of the reference NTP for the Mac, such as we
have on Windows.
As I remember you simply compile NTP on the Mac and it just worked.
No need for a port. Has something changed?
Le 16/11/2011 18:33, Chris Albertson a écrit :
On Wed, Nov 16, 2011 at 7:03 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
A pity that there isn't a port of the reference NTP for the Mac, such as we
have on Windows.
As I remember you simply compile NTP on the Mac and it just worked.
Hi
I think that the issue is not so much harmonics, as spurious signals on the
output (signals not equal to N times 10 MHz). Harmonics by themselves are
not a big deal.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of
As I remember you simply compile NTP on the Mac and it just worked.
No need for a port. Has something changed?Mac OS is really just
BSD with a big bunch of layered software on top.
Chris Albertson
I'd looked for a download, and not found one. I cannot imagine the
typically portrayed Mac
On 11/16/2011 8:47 AM, Chuck Forsberg WA7KGX N2469R wrote:
I don't know exactly which
timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
on the back of the oscillator, The back has separate coarse
and fine frequency adjustments. Can someone identify which
timebase is fitted to
Hi Chuck,
You need to look at the option sticker on the back of the unit. The 04* is the
oscillator option.
04T is a TCXO 3x10^7 per month temp1x10^6 0-40 deg C
04A Ovened oscillator 3x10^9 per Day temp3x10^9 0-45 deg
04E High stability ovened oscillator 5x10^10 per day temp7x10^9 0-50
It's even worse on the WiFi iPad - there is no way to automatically set the
time. You can only do it via the Settings page and that only gives you
minute resolution.
The Emerald-Sequoia app is nice, but since it can't actually fix the
time, every app that has time constraints has to do its own
It's even worse on the WiFi iPad - there is no way to automatically set
the
time. You can only do it via the Settings page and that only gives
you
minute resolution.
The Emerald-Sequoia app is nice, but since it can't actually fix the
time, every app that has time constraints has to do its
On 16 November 2011 18:21, David J Taylor david-tay...@blueyonder.co.ukwrote:
It's even worse on the WiFi iPad - there is no way to automatically set
the
time. You can only do it via the Settings page and that only gives you
minute resolution.
The Emerald-Sequoia app is nice, but since it
There are other Racal timebase options as well.
I have a Racal 1999 counter that originally had a 04C timebase option
that was not ovened and had a single adjustment screw. I replaced it
with a 04A ovened ocxo that has a single adjustment screw. I will
shortly install a 04E ocxo as Robert
On Tue, Nov 15, 2011 at 10:22 PM, Sylvain Munaut 246...@gmail.com wrote:
But a DDS would require a DAC somewhere. Here, I see can see the trace
from the PLD pin, to the LC filter to the RF connector ... and I
probed the PLD output, it's a square wave.
I don't know how this device works, an
I doubt we will ever see good time keeping on an IOS type device. The
problem is battery life. Good time keeping requires a stable local
oscillator of some kind that must remain powered up 24x7. But to get
the long battery life they must power off everything they possibly
can. No mater how
These counters used Racal's own 94xx series OCXO's. The 04A normally had a
9442, the 04E had the 9420. Easy way to tell which is which is the size. They
are both 51mm (2) square with the 9442 being 51mm tall and the 9420 is 96mm
(3.75) tall. The 9442 is also classed as fast warm-up, 6 minutes
I doubt we will ever see good time keeping on an IOS type device. The
problem is battery life. Good time keeping requires a stable local
oscillator of some kind that must remain powered up 24x7. But to get
the long battery life they must power off everything they possibly
can. No mater how
Modern CPUs typically change their clock speeds and can go real slow while
idle. This is why modern PCs keep so much worse time than their 1990s
ancestors.
On Wed, Nov 16, 2011 at 2:56 PM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
I doubt we will ever see good time keeping on an IOS
Message: 5
Date: Wed, 16 Nov 2011 10:35:01 -0800
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] iPhone keeping better time?
Message-ID:
Hi Robert these were used in the old 9025 and 9026 nixie counters as well.
You can often pick these up for les than the value of the OCXOblast
there I have given my secret away :-))
My own experience is that these are very good after they have been operated
by someone else, say the military,
Chris, I can see your point, but these devices must have a CPU running all
the time, otherwise how would the soft power-up work? Can the drain of a
CMOS clock chip such as that used in millions of PCs be all that much more?
CPU chips used in battery powered systems typically have a way to
Le 16/11/2011 18:42, mike cook a écrit :
Le 16/11/2011 18:33, Chris Albertson a écrit :
On Wed, Nov 16, 2011 at 7:03 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
A pity that there isn't a port of the reference NTP for the Mac,
such as we
have on Windows.
As I remember you simply
m...@miguelgoncalves.com said:
On every sync, the timestamp returned from the NTP server is on the 6 ms
mark this means that the local clock of the Arduino drifts a lot. I am
installing a realtime clock (Chronodot) this weekend that has an accuracy of
+/- 3.5 ppm from -40C to 85C (I read
Robert,
Do you have any information as to where a 9421 stands in this regime, specs
etc? It is the same size as the 9420 and has a doubler board attached, but I
don't know what equipment it was used in.
Regards,
John H.
On 16 Nov 2011, at 19:56, Robert Atkinson wrote:
These counters used
Hi John,
The 9421 Is 5V power, 9420 is 12V.
Some turned up on ebay UK last year. ex military equipment and about $50 a pair.
From: John Howell j...@howell61.f9.co.uk
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wednesday, 16
Hi
In the modern version of the 5680 the VCXO is at exactly 60 MHz. The PLD has
a fixed divide by 6 to generate the 10 MHz output. There's no dithering or
DDS stuff between the VCXO and the output. All of the DDS stuff is in the
loop that drives the gas cell. The DDS is an Analog Devices part.
On Wed, Nov 16, 2011 at 11:56 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
Chris, I can see your point, but these devices must have a CPU running all
the time, otherwise how would the soft power-up work?
The ARM processor has a power manager that wakes the CPU and powers it
up when
On 11/16/2011 11:56 AM, Robert Atkinson wrote:
These counters used Racal's own 94xx series OCXO's. The 04A normally had a 9442, the 04E
had the 9420. Easy way to tell which is which is the size. They are both 51mm (2)
square with the 9442 being 51mm tall and the 9420 is 96mm (3.75) tall. The
Thanks Alan, just what I wanted!
J.
On 16 Nov 2011, at 22:58, Alan Melia wrote:
Hi John the attached is out of a 1987 catalogue.
Alan
G3NYK
- Original Message -
From: John Howell j...@howell61.f9.co.uk
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Hi:
Looking for any documents or other information on the subject GPS simulator.
http://www.prc68.com/I/NTgpsSTR2760.shtml
Also any info on the power supply brick which seems to be dead.
rated 5V/60A, +12V/12A, +5V/12A.
EN60950
BS7002
LR91780
p/n: E25025
--
Have Fun,
Brooke Clarke
I have two of these beasties, which I'm lead to believe work with a
5061A cesium standard.
I also managed to find and download the service manual / user guide for it.
I will offer them here first before ebay. Maybe they are useless, don't
know. Make a fair offer.
They were paired with HP
One immediate thought based on the fact that the PSU has a BABT
approval sticker and Made in the UK on it - is this designed for a
230V supply?
Regards,
Pete
On Thu, Nov 17, 2011 at 9:53 AM, Brooke Clarke bro...@pacific.net wrote:
Hi:
Looking for any documents or other information on the
Would be curious on the manual.
Thanks
Paul
WB8TSL
On Wed, Nov 16, 2011 at 9:11 PM, jim s j...@jwsss.com wrote:
I have two of these beasties, which I'm lead to believe work with a 5061A
cesium standard.
I also managed to find and download the service manual / user guide for it.
I will
Hi Pete:
The IEC line entry module has a block that can be installed for either 110 or
220 VAC operation.
The power supply brick is marked for 110VAC and the line core hot and neutral
have continuity to those input terminals.
So, I don't think it's looking for 220.
Have Fun,
Brooke Clarke
The manual says Model 10638A Degausser is used with any HP 5061A Cesium
Beam Standard which has Option 004 High Performance Tube installed.
Degaussing is needed to obtain optimum performance from the Option 004 Beam
Tube.
Thanks should be interesting was always curious about them.
On Wed, Nov 16, 2011 at 9:53 PM, Robert Darlington rdarling...@gmail.comwrote:
The manual says Model 10638A Degausser is used with any HP 5061A Cesium
Beam Standard which has Option 004 High Performance Tube installed.
Degaussing is
Bob good read and really appreciated the link.
I had a bad 004 tube so swapped in a standard tube. That tube wasn't in
great shape either but I learned a lot doing it.
So now I finally see what the magical degausser was all about. Clever how
they did it and could be reasonable implemented in newer
Yet another challenge to proper time-keeping. I think that I will
re-calibrate the sundial in my yard and declare it Montalvo Road Time
(MRT) and darn to those who disagree!
http://www.sltrib.com/sltrib/utes/52072031-68/clocks-power-grid-electric
.html.csp
Craig McCartney
160
See also:
[1] http://code.google.com/p/ios-ntp/wiki/WhatsItAllAbout
[2]
http://www.quora.com/Will-iOS-5-Support-NTP-so-that-the-iPad-can-keep-time
Under iOS 5, you can tell an iOS device to automatically set its time
and it appears to use a very simple timed to do it, see the second
Chris, I can see your point, but these devices must have a CPU running
all
the time, otherwise how would the soft power-up work?
The ARM processor has a power manager that wakes the CPU and powers it
up when events like a WiFi packet comes in or there is some input by
the user. The CPU is
Yet another example of what a reporter can do when the facts are not
understood. The speculative headline is catchy but dead wrong.
Back when it was written last summer, there was a plan to deregulate
the frequency. The reason it was even proposed is that most clocks
now are battery powered and
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