Have just done a search on EBay. Which one in particular?
From what I can see, it looks like someone has broken up a CommSync II.
There are GPS and output modules listed. Not much good on their own.
Check out http://www.zyfer.com/
for info on the CommSync II product line.
Rob Kimberley
I am looking for a commercial drop-in module/solution of a
time-to-analog or even time-to-digital converter module with = 1 ps
resolution (device should eventually go on a printed-circuit board).
Critical issues are: linearity, stability, accuracy, jitter and
precision. The maximum time
There was a thread about such a chip a few months ago, I think.
-John
I am looking for a commercial drop-in module/solution of a
time-to-analog or even time-to-digital converter module with = 1 ps
resolution (device should eventually go on a printed-circuit board).
Check out www.acam.de where the part I made note of was the TDC-GP2. But it
only has resolution of 50ps rms.
From: J. Forster j...@quik.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Tue, December 14, 2010 9:54:55 AM
Hi
Do you also require precision in the ~ 1 ps range as well as resolution?
If so, that opens up a whole series of issues about:
1) How long since it was calibrated
2) Temperature and other environmental effects
3) Traceability of calibration
Not a simple or cheap problem to solve.
Bob
Hi Dabney,
Sorry for the silence, I missed your reply. It's impossible to know without
full details but I'm not sure that the 10kHz output is that suited to this
application. The Jupiter has a 1 Hz update rate. As I understand it the 10kHz
is updated at 1Hz which can cause phase jumps. I assume
Josef Kölbl wrote:
I am looking for a commercial drop-in module/solution of a
time-to-analog or even time-to-digital converter module with = 1 ps
resolution (device should eventually go on a printed-circuit board).
Critical issues are: linearity, stability, accuracy, jitter and
precision. The
On 12/14/2010 06:10 PM, Bob Camp wrote:
Hi
Do you also require precision in the ~ 1 ps range as well as resolution?
If so, that opens up a whole series of issues about:
1) How long since it was calibrated
2) Temperature and other environmental effects
3) Traceability of calibration
Not a
Hello
I found Greg Burnett page with question about TRAK model and I have a
question, too.
Maybe you can help, where did you buy this unit cause I'm looking for GPS
synchronizer Model 8901-1 , for our Trak Modular Frequency/Time System
Model 8900-50 and TRAK stopped produce it
Best regards
Hi
If such a device is not available at a practical price / not available at all -
Are you open to building a TDC / TAC from parts?
Bob
On Dec 14, 2010, at 7:59 AM, Josef Kölbl wrote:
I am looking for a commercial drop-in module/solution of a time-to-analog or
even time-to-digital
I'm going to assemble an NTP sever.I have a suitable computer that
actually has both a serial and parallel port that I can connect a 1PPS
signal to.
I have a question about the GPS recever requirements. Realistically
what level of accuracy is required of the 1PPS signal? The reason I
ask is
I have a question about the GPS recever requirements. Realistically what
level of accuracy is required of the 1PPS signal? The reason I ask is
because I can buy a Motorola UT+ OnCore for about $15, the CW12+ for about
double the and a new CW12 for a maybe $90. My hunch is that the specs on
Fellow time-nuts.
Over in another part of the internet is a group of people who love their
Casio G-Shock watches. These digital watches have been around for decades
and are built very well.
The one I own is an atomic and solar model (i.e. no battery replacement).
However being in Tasmania, I
Hi Robert,
We have the Jupiter working well in our prototype;
just need more of them for the final units.
I've met Dave and know about his work. My timing
requirements are a bit slower than Thrust SSC.
I can only imagine what an experience that must
have been.
I'm involved with a number of Open
Jim,
I have such a watch, purchased in Singapore in Oct 2009. It is
solar, but it has no radio connection. It is water-resistant
to 20 atmospheres (bar). I don't wear it, but I keep it by a
southern window.
The back cover appears to be held on by four screws. I've not
tried to open it. It's off
On Tue, Dec 14, 2010 at 8:16 PM, Jim Palfreyman jim77...@gmail.com wrote:
Fellow time-nuts.
Over in another part of the internet is a group of people who love their
Casio G-Shock watches. These digital watches have been around for decades
and are built very well.
The one I own is an atomic
Interestingly, the module has a pad that gives off a stepped square wave at
32768/48 Hz. So with well calibrated equipment (which we all have of course)
it is trivial to adjust the trimmer to put the watch back to decent
accuracy. Using the smallest adjustment of the trimmer that I could
On Tue, Dec 14, 2010 at 7:44 PM, Hal Murray hmur...@megapathdsl.net wrote:
How good is your antenna location?
The newer units are probably more sensitive.
If you get a unit with timing mode firmware, it will work with only one
satellite.
I can place the antenna on ashort mast on rooftop
Fellow clock-tickers,
I'm finally starting to learn microcontrollers, and have selected
Atmel's AVR line as my tool of choice. I've also discovered the Arduino site,
and am starting to learn their IDE as well.
My first goal will be an open-source/open-hardware IRIG-B decoder
I've downloaded and read some of the GPS user manuals. The new ones are 12
channel and older ones are 5 or 8.I guess with a surveyed location you
could get time from just one satellite. But you'd need more if you wanted
to take account of the atmosphere. I don't know if receivers do
Fellow clock-tickers,
I'm finally starting to learn microcontrollers, and have
selected Atmel's AVR line as my tool of choice. I've also
discovered the Arduino site, and am starting to learn their IDE as well.
My first goal will be an open-source/open-hardware IRIG-B
decoder
Might want to have the watch near body temp when you adjust?
Don
- Original Message -
From: Jim Palfreyman jim77...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, December 14, 2010 9:16 PM
Subject: [time-nuts] Adjusting accuracy of
Bruce: You may not need the Mega. I started with the arduino in
duemilanuove, and found that there are chips with the bootloader available.
The IDE is actually pretty good, not too steep, and there are libraries
available for lots of peripherals and lots of sample code. I suggest
Sparkfun as a
If the goal is to learn about AVRs that is a good project. But if you
want a cheap IRIG decoder I bet you already have one. An IRIG driver
is included with NTP. The NTP driver reads the time code from an
audio interface set for 8Khz sample rate.If you are writing a
decoder it might be good
Referring to the post with the mechanical procedure, you
determine the offset over a couple of weeks. When you
open the watch to adjust it, you apply the offset to
whatever frequency you find when you open the watch.
I don't wear a watch when I sleep, and that becomes part
of the offset to be
Magnus Danielson schrieb:
On 12/14/2010 06:10 PM, Bob Camp wrote:
Hi
Do you also require precision in the ~ 1 ps range as well as resolution?
If so, that opens up a whole series of issues about:
1) How long since it was calibrated
2) Temperature and other environmental effects
3)
Bob,
yes, building a TDC/TAC is not a problem.
Thanks.
Josef
Bob Camp schrieb:
Hi
If such a device is not available at a practical price / not available at all -
Are you open to building a TDC / TAC from parts?
Bob
On Dec 14, 2010, at 7:59 AM, Josef Kölbl wrote:
I am looking for a
Bill,
Indeed undoing the four screws is all that's needed. However on some
models those screws are covered by various plastic bits which are
quite confusing to remove. (Unless you are a gshock-nut!)
Jim
On Wednesday, 15 December 2010, Bill Hawkins b...@iaxs.net wrote:
Jim,
I have such a
Le 15/12/2010 07:26, Hal Murray a écrit :
But my question was about NTP and if NTP on a typical computer could make
use of 1PPS that is down in the nanoseconds
A microsecond or few is generally great for NTP.
One of the main considerations is temperature of the local crystal which can
29 matches
Mail list logo
