Contrary to popular belief, most of us in the U.S. have heard of the metric
system and understand how it works. Personally, I agree that it is a
simpler and superior system.
But, English is the system we "think" in. We know that if a person is 300
lbs they need to lose weight, you need to drink
I've done it before with the Palisade driver in non-polling mode. It
works, but you have to rely on the timing of a serial port and apply your
best guess for a delay. If he's trying to detect phase differences between
multiple thunderbolts, the serial port + OS combination might be too
jittery to
There are some issues using a Thunderbolt with NTP. See
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver29.html (the stuff
about event polling).
Also, you will need http://www.tapr.org/kits_fatpps.html (or something like
it) if you want to use its PPS signal with NTP.
On Wed, Nov 30, 201
If you can get that part working, let me know and I'll give you a way to
choose a different COM port in Thunderhead.
On Wed, Nov 30, 2011 at 12:10 PM, David VanHorn <
d.vanh...@elec-solutions.com> wrote:
>
> So the question is, does the Ipaq BT implementation support SPP? If so,
> then this shou
Happens with traditional serial ports, too.
On Tue, Nov 29, 2011 at 12:53 PM, David VanHorn <
d.vanh...@elec-solutions.com> wrote:
>
> That sure sounds like "Psychomouse"..
>
> I've never seen it happen except on USB serial ports. Apparently when they
> enumerate, windows tries to figure out what
;d
just use the Emerald-Sequoia NTP app :-)
On Mon, Nov 28, 2011 at 5:12 PM, Chris Albertson
wrote:
> On Sun, Nov 27, 2011 at 8:00 PM, Justin Pinnix
> wrote:
> > Sounds like a good idea for a modern handheld, but the relics we are
> > talking about don't have WiFi or a
l fit the iPaq display. Thanks to you, that may become my
> next
> > project. I'm very appreciative that you posted your work.
> >
> > Just wanted to let you know there is interest in your work and to
> encourage
> > you.
> >
> > tnx & 73
> &g
> >
> > Robert G8RPI.
> >
> >
> >
> >
> > From: Kevin Rosenberg
> > To: Discussion of precise time and frequency measurement
> >
> > Sent: Saturday, 26 November 2011, 17:12
> > Subject: Re: [time-
l cost.
>
> Thank you for making this avialable.
> Robert G8RPI.
>
>
>
> ________
> From: Justin Pinnix
> To: Discussion of precise time and frequency measurement <
> time-nuts@febo.com>
> Sent: Friday, 25 November 2011, 22:55
>
Dunno. Does the NMEA driver work on the Meinberg NTP for Windows?
On Fri, Nov 25, 2011 at 6:45 PM, Chris Albertson
wrote:
> On Fri, Nov 25, 2011 at 2:01 PM, Don Latham wrote:
> > Just redoing a PC in the shop. Don't know if I've suggested a program
> > called NMEATime to the nuts.
>
> This work
Nuts,
A while back, I scored an old Compaq iPaq Pocket PC for cheap at an
auction. Recently, I wrote a program for it that reads the time and health
information from a Thunderbolt and displays it in real-time. More info
available here: http://www.fuzzythinking.com/projects/thunderhead/
I may b
I'm no physicist, but is it possible that the speed of light is faster than
we thought it is? Space isn't a perfect vaccum, and we know neutrinos are
less affected by "stuff" than photons. Maybe they travel closer to c than
the actual photons we have been able to measure...
On Sunday, November 2
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 I
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 ow
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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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ti
I like his "NO timewaster" disclaimer. I've been yelling that at people
around the office :-)
On Tue, Nov 15, 2011 at 3:57 PM, Javier Herrero wrote:
> El 15/11/2011 20:09, Peter Gottlieb escribió:
>
>
>>Ebay seller "nichegeek" will take $35.00 shipped for these units. You
>>can't buy a
On Mon, Nov 7, 2011 at 11:30 AM, Jim Lux wrote:
> $100k/hr -> about $1000/day.. If the $250 widget and an hour meets the
> need, it's a win.
>
Might oughta check your math there, buddy. $100K/hr is quite a lot of money
:-)
(just kidding, was obviously a typo)
But, back to the original point
Update -
I attempted to look at the analog signal. I looked at the output of the
crystal. With the scope's low-pass filter turned on I was able to see a
very weak sine wave with a period of roughly 15us. It was too weak for any
analysis.
http://www.fuzzythinking.com/wordpress/wp-content/upload
On Mon, Oct 31, 2011 at 1:54 AM, David J Taylor <
david-tay...@blueyonder.co.uk> wrote:
> Nuts,
>>
>> I recently picked up a C-Max evaluation kit from SparkFun to see if this
>> $10 board could be used as a precision timing source. The short answer is
>> no. The long answer is available at:
>> h
d it hard to believe. I'm certainly not suggesting
> this explains your results, only that you might want to look into it.
>
> Regards,
> Brent
>
> On Oct 30, 2011, at 16:09, Justin Pinnix wrote:
>
> > Nuts,
> >
> > I recently picked up a C-Max evaluation k
Nuts,
I recently picked up a C-Max evaluation kit from SparkFun to see if this
$10 board could be used as a precision timing source. The short answer is
no. The long answer is available at:
http://www.fuzzythinking.com/?page_id=29 .
It was a fun experiment and a great excuse to play with test e
Looking at recent instances of thread-breaking tells a different story:
X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20110929
Thunderbird/7.0.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.21)
Gecko/20110
If I'm doing my math right, the supernova is a 2.03e-9
discrepancy(3/24/365/168000). CERN's discrepancy was 2.464e-5
(60e-9/2.435e-3) That's nearly 4 orders of magnitude more dramatic.
Thanks,
-JP
On Mon, Oct 24, 2011 at 10:06 PM, Hal Murray wrote:
> > Sounds like a good excuse to build a moon ba
The thunderbolts produce status information and error estimates about how
they are doing. If you are willing to trust that, you can remove the one
that is falling out of tolerance. If you aren't willing to trust that, then
I'm pretty sure you'll need a third frequency standard to compare each to.
You guys should get out of the dark ages and use a modern mail client. Then
it won't matter!
I won't name names, but the one I use is popular, has a web front end, keeps
all of my mail around in a searchable format (no need to waste your time
generating a word doc), squashes out quoted fragments
Brooke,
I disagree. Hard drive sizes have done nothing but soar over the last
30 years. So, even if you have to replace them every 10 years, you
only have to buy 1/10th the number of drives every decade.
This is exactly my data retention strategy. Every time I get a new
computer, I copy my dat
I have a Nuvi and I love it. I have used it all over the country and
it has gotten me where I need to go. Is it wrong sometimes? Sure,
but it's wrong a lot less than I am in a strange city. Also, I don't
care if it is wrong in my own neighborhood - I know where everything
is there. It stays in
Paul,
That is very much appreciated. I have one of these boxes. I didn't realize
that the signal was no longer being broadcast, so at this point I'm all for
whatever hacks will make it useful.
Thanks,
-JP
On Fri, Dec 3, 2010 at 5:55 PM, paul swed wrote:
> Well I think this puts me in the dan
" pulse appears where you expect it to be on the
scope.
Thanks,
-JP
On Sat, Dec 19, 2009 at 2:01 AM, Don Latham wrote:
> Is this the basis document for the Heathkit Most Accurate Clock???
> Don
>
> - Original Message - From: "Justin Pinnix" <
> jus...@fuzzythi
Hi Nuts,
Most of you have probably seen this before, but I ran across a great
1975-vintage paper on how to synchronize your clocks and frequency standards
to WWV's HF broadcasts. The equipment needs are very basic - a clock, a
radio, and an oscilloscope. The procedure is simple and far more reli
On Sat, Dec 12, 2009 at 6:33 AM, Mike S wrote:
> At 06:47 PM 12/11/2009, gandal...@aol.com wrote...
>
> Unfortunately, that's not really the way it is.
>>
>
> That's opinion, stated as fact.
That all depends on what your definition of "is" is :-)
___
I'm hearing a lot of recommendations for types of oscillators, but noone has
asked the question - what is the desired performance?
For me, I wanted a clock that stays within a second of UTC for a year. I'm
pretty sure the LPRO I bought will exceed that, (though I guess I won't know
for another 12
Yes. I just built one. It was an original design based around the parts I
could scrounge. My cost was around $200 and it took me about 2 months to
complete. I don't know of any kits or any commercial units available in
that price range.
But, remember that Rubidium just gets you a stable oscill
David,
You probably know this already, but you can walk into any electronics store
and buy a 16GB USB thumb drive for 20 dollars that will hold the equivalent
of 136 LS-120 floppies. You might be better served by moving your
collection to a more modern media.
Remember that magnetic media (disks,
The procedure you describe is useful for a retrieving data from a drive
where some files have been corrupted rendering the system non-bootable. But
NO operating system (not even MacOS) can cure a drive that has suffered a
complete hardware failure. It's just not possible.
On Fri, Dec 4, 2009 at 9
Hi Mike,
I'll reply to the list because others will probably give you a similar
reply.
First of all, thank you for your interest in amateur radio. It's often
described as a hobby with lots of sub-hobbies, so chances are you can find
something that will pique your interest for a long time.
Don't
Hi Rex,
Sounds like a neat application. 100 meters might be a bit long for RS-232.
I was taught that 50 feet is the limit for 9600bps. You may need to use
RS-422 (balanced version of 232), low capacitance cable, or a lower baud
rate. Since you're a ham, you could also do it wirelessly over UHF
Contrary to popular belief, us pilots do know how to fly without GPS. I
have never seen an IFR aircraft with a GPS that didn't also have a VOR
receiver. Any VFR aircraft can be navigated using the Mk I eyeball.
IFR certified GPSes have integrity monitoring. So, if the signal gets
jammed or ther
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