At 12:57 PM 5/21/2018, Gary E. Miller wrote:
As the manual says:
"Quantization error of time pulse (not supported for the FTS product
variant)."
The NEO-M8T is an FTS product.
Are you sure about that? I thought the M8T was timing, and the M8F
was FTS. Please check your firmware version strin
At 09:23 PM 5/20/2018, Gary E. Miller wrote:
I do not see the keyword 'sawtooth' in the u-blox 8 doc. Can I buy a clue?
UBX-TIM-TP, "Time Pulse Timedata". Look for "Quantization error of
time pulse". I'm seeing this on page 359 of the ublox 8 receiver
description/protocol spec book.
--
ne
At 05:46 AM 4/12/2018, jimlux wrote:
It turns out that some of the newer Android phones support an API
which returns raw GNSS data and that can be logged to a file in
RINEX format. There's a few apps out there that do this although
I've not tried it (my Samsung S6 doesn't have the right hardwa
At 01:21 PM 3/31/2018, Mark Sims wrote:
Or on the GPS/GNSS signals... I was verifying Lady Heather's
support for the old SV6/Palisade/Acutime receivers and came across a
mention of the "GPS System Message" command. It is requested by
TSIP packet 0x28 and returns
I dug into this a while bac
At 06:44 AM 11/11/2017, Tom Van Baak wrote:
So, Scott, give the FS740 a try. See if SRS will loan you one for a
few weeks and report back to us on what you think.
I've sent a couple of emails to i...@thinksrs.com with no reply yet.
If anyone has a sales contact at SRS, please pass it along.
At 12:39 PM 11/11/2017, Tom Knox wrote:
The FS740 is interesting. Obviously it has a lot going for it, but
what appears to be missing is graphic data display capabilities
which would simply be a few line of code. Perhaps I missed something
skimming through the manual.
I don't think you missed
What current production freq counters do people like for general
time-nuttery these days? There's a chance I can get a decent counter
for work, so I'm looking for suggestions. Bonus points for fanless.
Don't need anything past 200 MHz or so. Prefer ethernet over USB or GPIB.
The SR620 looks to
At 05:20 PM 9/26/2017, Tom Van Baak wrote:
An interesting note from Said, below...
I've sent a couple of queries out to GPS professionals.
Feel free to comment if you have concrete information that would help.
Also, if during the past week any of you were logging almanacs or
continuously recordi
At 10:35 PM 8/21/2017, Mike Garvey wrote:
thanks Scott...
where are you located?
The weather data is from western Arkansas.
--
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We got about to about 90% here.
My most interesting data so far is the minute-by-minute weather data:
http://n5tnl.com/time/eclipse_2017/index.html
I've got raw data from two GPS units (uBlox LEA-6T), but I don't know
what to do with it. Tried to set up and capture WWVB, but it looks
pretty ra
At 12:13 AM 8/4/2017, Chris Waldrup wrote:
So no voltage out to antenna. I do have one of those 6V max
polyphasers but we did get some really close strikes recently.
Oh. As someone who lost a tbolt to lightning last year, I feel your pain.
I've had to change the Oncore UT Plus receiver board
I've come up with a couple of old net4521 boards, and I'm looking for
advice on what OS to run. They're 486 class CPUs, so I doubt anything
recent will run. If you've still got one running, please let me what
OS and release you're on.
Thanks!
--
newell N5TNL
___
At 03:52 PM 3/22/2017, Nick Sayer via time-nuts wrote:
Just a little side query
For those using one of
these sorts of splitters with a Thunderbolt, have you seen anything odd?
My thunderbolt *insists* on being on the DC Pass port. If you put it on a DC
Mine doesn't. I just swapped ports arou
I see that my credit card has been charged. Is that a hint that the
TICC project is moving along? Should I start gathering up cables and
SMA adapters?
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Decent signal tonight. Looks like they got the DUT1 bits (from -0.4
to +0.6 s), the leap year bits, and the leap second bits switched
over on schedule, too.
Sat Dec 31 23:59:00 2016 | | X
Sat Dec 31 23:59:01 2016 |
I'm trying to watch the google NTP server leap second smear. This
page should update once/minute with my latest data.
http://www.n5tnl.com/time/leap_2016/index.html
Sorry about the coarse resolution--I've set another monitor station
to poll more often and I'll try and append that graph shortly
At 03:19 PM 3/31/2016, Ryan Stasel wrote:
I do know 74AC04s are horribly prone to ESD
damage
replaced more than a few when working on older bench multimeters.
You may need to get in there and probe a bit. In
my case, my bad RS232 driver was drawing about
350mA and getting VERY hot, VERY fa
At 11:46 AM 4/11/2016, Tom Van Baak wrote:
Another way might be to use single-channel common view GPS. I've not
checked recently to see if 100 ps is possible over a 1 km baseline.
If so that would be a less expensive solution. Someone should dig
into the RINEX mode of the ublox 6T. It's on my l
At 08:13 AM 3/31/2016, paul swed wrote:
Its just that a strike that close creates one heck of a pulse. Further
todays homes may have a lot more wire in them phone cable power and
ethernet. So lots of ways to carry the pulse.
Agreed. The only tbolt cables attached, serial and PPS, ran around
t
10 MHz output active, no PPS, no comm with LH.
My tbolt was disconnected from the outdoor GPS antenna today, and so
I wasn't too concerned when we had a strike in the backyard this
morning. The PC attached to the serial port and PPS output died, and
that cable was fairly long, so I guess that'
I've been recording the WWVB timecode output from a salvaged walmart
clock module, so I examined the recent changes at bits 57 and 58.
Looks like they got it exactly right. Here's the minute before and after.
Midnight Saturday (UTC), they turned on bit 57 to indicate DST begins Sunday:
Sat Mar
At 12:59 AM 2/14/2016, Hal Murray wrote:
newell+timen...@n5tnl.com said:
> My tbolt shows a massive loss of sats starting around 00:15 through 01:56.
Where are you located?
Arkansas.
I have crappy antennas so holdover is common. It's been good weather
Outdoor antenna, but so-so placemen
At 07:34 PM 2/13/2016, Rob S. wrote:
Content-Transfer-Encoding: 7bit
Hello Group,
A friend about 2Km up the road from me and I both run the Trimble
Thunderbolt GPSDO. For a few years now they have both worked flawlessly.
Around 1/2 an hour ago ( I wasn't in front of mine when it happened ) at
At 09:12 AM 1/26/2016, Paul Boven wrote:
Has anyone else seen GPS time jump by -13.7 usec today?
My tbolt locked ntp server saw an unusual spike of about that
magnitude just after 00:00 1-26-2016 UTC. (The bump at 4 seconds
is from the daily backup run.)
--
newell N5TNL
__
At 10:00 PM 12/29/2015, Bob Camp wrote:
DSP by a legit Time Nut:
http://link.springer.com/book/10.1007/978-1-4757-4990-8
How about xtal osc and temp compensation by same dude:
http://link.springer.com/book/10.1007/978-94-011-6056-8
--
newell N5TNL
___
At 10:48 AM 12/29/2015, Bob Camp wrote:
Is there a practical way to download the entire book rather than
doing 60 individual
downloads for each fragment of the text?
Sure, click the "Download book" link? (OK, I had to create one of 'em.)
> The Quantum Beat
> http://link.springer.com/book/1
At 12:40 PM 8/5/2015, Graham / KE9H wrote:
Content-Transfer-Encoding: 8bit
There are several high end audio Analog to Digital Data converters that
will clock at 192 kHz, ~23 bits ENOB, which puts a 60 kHz signal sweetly in
the first Nyquist zone. Typical NF of the front end of the data converter
At 05:43 PM 8/4/2015, Donald wrote:
I have been looking into WWVB receivers.
I see that the sources I had purchased from a few years ago are no
longer available(in the US).
I've bought modules and antennas recently from Germany and the UK:
http://www.pvelectronics.co.uk/index.php?main_page=i
At 07:15 AM 7/1/2015, J. L. Trantham wrote:
Interestingly, the time is 23:59:60 but the UTC ofs is still 16.
I guess it increments to 17 at the end of that operation, i.e., at 00:00:00.
I just pulled the next screenshot to check, and you're correct:
https://www.n5tnl.com/time/leap_2015/tbolt_
At 09:23 PM 6/30/2015, Tom Van Baak wrote:
That's a nice WWVB result. Yes, the triple marker pulse looks is
correct for a positive leap second. What did you use for a receiver?
The receiver module and ferrite bar antenna from a Westclox 70026
desktop 'atomic clock', as available from Walmart
My linux parallel port WWVB 'scope got a bit confused at the leap second:
Tue Jun 30 23:58:59 2015 | | X
Tue Jun 30 23:59:00 2015 | | X
Tue Jun 30 23:59:01 2015 | -
The "/nd=1sr" command made this capture a piece of cake:
http://www.n5tnl.com/time/leap_2015/tbolt_leap.gif
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At 04:20 PM 10/22/2014, Alexander Pummer wrote:
may I get some copy of that datasheet?
I don't have the correct datasheet. The seller has a catalog page,
but it doesn't have specs for the non-EFC unit he's selling:
http://www.excesssolutions.com/cgi-bin/item/ES6542
http://www.excesssolution
At 03:43 PM 10/22/2014, Dave M wrote:
Content-Transfer-Encoding: 7bit
I contacted one of the MTI Milliren marketing guys a few days ago, and got
some specs on the MTI model 260-0624C and 260-0544C OXCOs that are currently
Be careful. I bought a couple of those $15 MTI 260-0544-C from a
surplu
At 11:24 AM 8/29/2014, Charles Steinmetz wrote:
Burt wrote:
Starting with time-nuts Digest, Vol 121, Issue 70, all of the posts
in a digest are running together with no breaks between individual
posts, just one long paragraph.
It's not just digests, I have the same problem since the list s/
I'm curious if an OCXO has an SC or AT cut crystal in it. There's no
EFC, so I can't measure sensitivity. I did measure the frequency
change from cold startup, thinking that an SC cut would stabilize
quicker than an AT. I don't have a good AT OCXO to compare against,
but I do have a Morion MV89
At 11:48 AM 7/21/2014, Chris Albertson wrote:
A better solution is to use a tachometer fan. Then the controller does not
set the fan voltage but sets the fan speed. there are still extra pins on
My thought exactly. I have not tried it, but it seems like this would
also automatically restart
At 04:09 PM 7/14/2014, saidj...@aol.com wrote:
I think we need to have a "Time Nuts For Dummies" article written that
takes J. Vig's writing and puts it into much less of a technically rigorous
And maybe a recommended list of simple experiments that new time-nuts
can perform.
--
newell N5
At 07:23 AM 7/4/2014, Bob Camp wrote:
There is a bunch of stuff on the Wentzel site about their double
wall mini-test chambers. It's probably the best approach to the
gradient issue. You still have a gradient around the inner chamber /
box, but it's consistent. You eliminate the coupling of th
At 11:01 AM 6/29/2014, Chris Albertson wrote:
Scott,
Could I ask you to post that "C crap" someplace? Would save me and
others some time.
It was posted back in 2012:
http://n5tnl.com/time/fe-5680a/control/fe5680_logger.c
Beware that the comments may be inaccurate. We now know more about
the
At 04:32 AM 6/28/2014, wb6bnq wrote:
monitoring process ? In other words have you traced out the
connections to see what is driving the pin you think is the temperature input ?
No. I've only traced back from the ADC input to the voltage divider.
The next big question is have you monitored t
At 10:40 PM 6/27/2014, Scott Newell wrote:
to pin 4 of the 4 channel 12 bit ADC. Command 0x22 returns the ADC readings
Doh! Correction: command 0x5A reads the ADC, command 0x22 reads the
DDS tuning words. Sorry for the confusion.
--
newell N5TNL
At 10:03 PM 6/27/2014, Chris Albertson wrote:
So the FE5680A will actually change the DDS tuning word based on an
internal temperature sensor?
It appears so. (Again, assuming it's actually a temperature sensor. I
guess it could be measuring heater current?)
on how it works. Does the FE568
Bert asked me to send an update on the FE-5680 tempco mod progress.
It appears that the FE-5680A temperature signal (or maybe it's really
a current sense signal?) can be disabled by removing a single 10k
0805 surface mount resistor.
Using Elio Corbolante's terrific high-res scans, I've noted
At 04:23 PM 5/31/2014, paul swed wrote:
And though first run chips were available they are not to us unless we want
1000 of them. Also pricing is unclear.
If they don't have distribution set up yet, I can understand 1k min
orders...but no samples?
That said yes the intent is to receive tim
At 08:01 AM 5/31/2014, Bob Camp wrote:
Hi
Well that's a bit more information. We seem to be missing the
deployment schedule on the other new modulation formats. I kind of
doubt that the watch and clock guys are going to start the fabs
turning out millions of chips until they can test all the
At 04:38 PM 4/10/2014, Hal Murray wrote:
Does anybody have a favorite low-cost ARM board? I'm looking for a simple
I'm using one of the TI Tiva C series Launchpads for my ovenized PC
xtal project. ~$13, 80 MHz Cortex M4F (f=floating point), 256 kB
flash, 32kB ram, 12 bit ADCs, 32 bit timers
At 08:59 AM 3/27/2014, John Nelson wrote:
there something about Windows 7 that degrades the performance of NTP? Or is
there anything subtle I can check?
I've had some luck on win7 by setting maxpoll to 8.
--
newell
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At 11:03 AM 2/27/2014, Poul-Henning Kamp wrote:
Seriously: Keeping the computer alive and eating power is
silly. We just need to find out how to get the Linux configured
correctly.
Exactly. We use the PC-Engines ALIX x86 single board computer stuff
at work, and even I didn't have too much t
At 04:20 PM 2/14/2014, d0ct0r wrote:
hours is the same, but seconds and minutes has changed. Is there any
method to read all three values (HH:MM:SS) by one single requests ?
Or is there any other workaround for this issue ? Or it is not issue
at all ? Thanks !
Sure, read multiple registers (0
At 02:20 PM 6/2/2013, Don Latham wrote:
The manual at least hints that you will get 1 pps out no matter which
MHz signal is generated, although I find the presence of 1 pps out and
1 pps in signals a bit confusing...
It appears to have a TIC and logic for disciplining the pps out to a
GPS pps
Looks like one has issued (8,270,465). Application 20120082008
appears to be relevant as well.
http://www.google.com/patents/US8270465
http://www.google.com/patents/US20120082008
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National Institute of Standards and Technology
Telephone Time Service, Generator 1c
Enter the question mark character for HELP
D L
MJD YR MO DA HH MM SS ST S UT1 msADV
56108 12-06-30 23:59:35 50 1 -.6 045.0 UTC(NIST) *
56108 12-06-30 23:59:36 50 1 -.6 045.0 UTC
At 03:19 PM 4/18/2012, John Ackermann N8UR wrote:
The certificate "error" is because it's self-signed and not
commercial, which costs a chunk of change every year. We use SSL to
avoid sending passwords in the clear and not for ecommerce purposes,
so (apart from browsers complaining) there isn'
At 12:12 PM 2/22/2012, Chris Albertson wrote:
The only way I can figure is to look at the location they ship from.
My last package from nichegeek has a UPS label from Sain Store, Dong
Guan Sunrain e-commerce center, building 7 Songke Yuan in Dongguan.
--
newell N5TNL
_
At 09:24 PM 2/12/2012, Elio Corbolante wrote:
Being not yet able to dump the FE-5680A firmware, I started to write down
the DIGITAL part of the schematics:
<
http://www.rhodiatoce.com/pics/time-nuts/FE-5680A/FE-5680A_schematics_v0.0.pdf
>
I hope it can be useful to some of you. (any suggestion is
At 03:50 AM 2/13/2012, Azelio Boriani wrote:
I have always thought the space inside the cover was the outer oven... now
I realize this is not quite correct but then the MV201, specified as a
double-oven, can't be a double-oven. The MV201 has the crystal under a sort
I just checked the MV201 onl
At 11:10 AM 2/13/2012, Bob Camp wrote:
trash the unit. Of course if somebody has one they hooked up backwards on
the supply...
I doubt that would do it--there appears to be a series Schottky on
the power input line.
--
newell N5TNL
___
time-nu
At 05:45 PM 2/12/2012, Sam wrote:
Thanks for the pictures Scott, it was interesting to see under the
shell of these.
I wasn't expecting the inside to look so "hand made".
Yep. Some of the surface mount components appear to be hand
soldered. I was a little surprised that there was no mechani
At 08:26 AM 2/12/2012, Azelio Boriani wrote:
Extremely delicate that fluffy contton, try not to tear apart it so that
you can place it again on top when closing the MV89. In my opinion the
internal oven is the inner one...
If that's actually the inner oven, where's the outer oven? I don't
see
As requested, pics of the inside of my Morion XO00281M-CT-MV89 MV89A
double oven ultra precision OCXO, serial ZA5310, date 03/22. Sorry,
I didn't feel like peeling apart the outer oven.
Small pics (~50 kB):
http://n5tnl.com/time/mv89a/mv89a_1_small.jpg
http://n5tnl.com/time/mv89a/mv89a_2_small
At 11:20 AM 2/9/2012, Bob Camp wrote:
Hi
I would avoid super heat type approaches. The risk is getting the glass to
metal seals on the base to hot to fast. Normally the can needs more heat
than the base, but not always. A lot depends on just how thick each one is
and what they are made of.
It'
Got my replacement FE-5680 and a MV89 in from Nichegeek. I figured
I'd better power up and check the MV89 before I let 'em know
everything was ok. The MV89 is warming up nicely, the current is
down to 290 mA (and still dropping), but the output seems low; about
40 mV RMS as measured on a scop
At 03:20 AM 2/2/2012, Javier Herrero wrote:
I forgot... have you had the opportunity to check if the difference
between the two DDS programming words is the same in all cases? All
my readings leds to 1400.00x Hz, I've not looked at it but probably
the difference in DDS counts is constant.
So
Javier Herrero's exciting DDS discovery led to this plot of the unit
tweaking the frequency (cmd 0x22):
http://n5tnl.com/time/fe-5680a/graphs/dds_autotuning.png
It appears to make an adjustment even before lock!
--
newell N5TNL
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At 05:45 AM 1/29/2012, Javier Herrero wrote:
For example, the following data has been gathered:
Serial offset 00 00 00 00
DDS A word: 44 02 62 F6 = 1141007094 = 5 313 228.32219 Hz
DDS B word: 43 FD CC 8E = 1140706446 = 5 311 828.32085 Hz
Can you do a test at +/- fullscale offset as well?
Thi
At 06:17 PM 1/27/2012, J. L. Trantham wrote:
Same thing happened to me. AVG has no problem with it. I turned off
Symantec, downloaded it, saved it, and proceeded.
I don't really think there's much I can do. I sent in a false
positive report to Norton/Symantec, but I got back the dreaded "ca
At 07:08 PM 1/26/2012, Don Latham wrote:
I'd like to try this program, but my browser simply times out at the URL
supplied below. Is it right at:
http://n5tnl.com/time/fe-5680a/control/fe5680_info_win32.exe
Try again, please. (I had a firewall rule that kept getting
triggered by a bad link fr
At 11:36 AM 1/26/2012, Chris Albertson wrote:
The "option 2" that is in the book is different from the fine scale
adjustment the current $40 can do. the true option two units can be
programmed over a range of many MHz by sending RS232 commands but the
current units can only by programmed over
At 01:21 AM 1/26/2012, Rex wrote:
physical differences (like an sma output). Also, FEI has not been
responsive, to my knowledge, to any questions from us surplus
consumers/hackers.
I wonder if they'd be responsive to a 'group-buy' of documentation or
answers? Maybe it comes down to whether i
At 09:13 PM 1/25/2012, J. L. Trantham wrote:
Both pin 3 and pin 6 are 'high' when power is first applied. When the unit
'locks', both pin 3 and 6 go 'low' but pin 6 then puts out a 5 uSec wide 1
PPS pulse, as judged by my 'calibrated eyeball' which means that I used a
stop watch and counted the
I've been asked for a windows version of the FE5680 info dump app, so
here it is:
http://n5tnl.com/time/fe-5680a/control/fe5680_info_win32.exe
Please let me know if you have any trouble. It's a command line
program that's expecting a com port number as the only parameter
("fe5680_info_win32.e
Here's a graph of the ADC readings as I dropped the power supply
voltage from 18V down to 6V on my non-locking FE-5680:
http://n5tnl.com/time/fe-5680a/graphs/unit_1_volttest.png
I'd hoped that channel 2 would have been a supply voltage, but it
isn't, or it's one of the low voltage regulated ra
Here's some source and a cygwin binary (let me know if I need to do a
win32 binary) for a little app that will try all the known data
request commands on your FE-5680. If you're willing and able, I'd
like for you to run this against each unit you have before it's
locked and again after it's lo
John Beale was nice enough to convince me to clean up and release the
source code I've been using to plot data from undocumented FE-5680
serial commands. It builds cleanly on linux and cygwin at
least. Don't forget to link with the rt libs ("gcc fe5680_logger.cpp
-lrt"). Let me know if you h
[Resend due to oops last night involving multiple email accounts.]
And here are the graphs from unit #1, the one that won't lock:
http://n5tnl.com/time/fe-5680a/graphs/fe5680_1_ch3.png
http://n5tnl.com/time/fe-5680a/graphs/fe5680_1_ch4.png
--
newell N5TNL
Here's some data from one of my working FE-5680A units:
http://n5tnl.com/time/fe-5680a/graphs/fe5680_2_ch3.png
http://n5tnl.com/time/fe-5680a/graphs/fe5680_2_ch4.png
This assumes that the reply from the undoc command 0x5a is the raw
counts from the 4 channel 12 bit ADC. I think channel 3 is a
I'm playing around with the unlockable problem child. Turns out I
get a response from the unit to several undocumented serial port
commands. In particular, the replies from 0x22, 0x57, 0x59, and 0x5A
seem to vary each time I read the unit. Not all the commands respond
each time; there's cert
At 03:50 PM 1/18/2012, Robert Benward wrote:
I got my first one from nichegeek and it took a long time to
lock. Someone suggested I adjust C217 which worked, but if I jarr
the oscillator it will go
I've run it at least an hour without a lock. Tried running it open
and adjusting C217, but st
Just got my 3 in from nichegeek. Paid Thursday, shipped Friday,
arrived this evening. Wow. (Actually arrived too quickly--I don't
have my t-bolt running, so I can't easily do an accurate frequency check.)
Two power up and lock in <3 minutes. One powers up, gets toasty, and
gives 10MHz, but
At 10:26 AM 12/7/2011, Jim Lux wrote:
Yes, but do you have precision mass standards for feed scales at home?
Some of us do. ;-)
--
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At 07:09 AM 10/5/2011, John Ackermann N8UR wrote:
The mailing list system resends messages rather than just relaying
them. List messages won't show details of the originating sender path.
Really? It appears to me that your message was sent from
10.73.100.66 through a dsl line
(h69-128-27-
I finally built a timelapse movie of the 60 Hz clock + webcam
experiment. It covers about a week, but there may be a gap or
three. It's a 20 MB file (tested with VLC and mplayer).
http://n5tnl.com/tec/timelapse_clock.mov
I need to improve the lighting to eliminate the horrible shadow
around
Looks like they're going to talk about it again in December:
http://www.nerc.com/page.php?cid=6%7C386
--
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and f
Cumulative error, starting at MJD 55780 (difference scaled by 100 and
smoothed):
http://n5tnl.com/tec/55780/55780.png
Frequency error, 3600 s intervals:
http://n5tnl.com/tec/55780/55780_3600.png
Frequency error, 600 s intervals:
http://n5tnl.com/tec/55780/55780_600.png
Frequency error, 60 s in
Added recent snapshots of the live graphs:
http://n5tnl.com/tec/55779/sparc/sparc.htm
http://n5tnl.com/tec/55779/tock/tock.htm
These are in localtime (CDT), not UTC.
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Cumulative error, starting at MJD 55779 (difference scaled by 100 and
smoothed):
http://n5tnl.com/tec/55779/55779.png
Frequency error, 3600 s intervals:
http://n5tnl.com/tec/55779/55779_3600.png
Frequency error, 600 s intervals:
http://n5tnl.com/tec/55779/55779_600.png
Frequency error, 60 s in
At 07:13 PM 8/6/2011, Hal Murray wrote:
new...@cei.net said:
> The general shape and bumps in the plots track nicely, but I'm wondering
> why there's so many cycles difference after 36 hours.
How are you collecting the data? What's the time between samples?
First off, your TEC data was an i
At 03:27 AM 8/4/2011, Bill Hawkins wrote:
What that means is, that if the two locations representing the
red and green traces are on the same grid then there should be
less than one cycle difference between them at all times.
That's what I was expecting.
NTP can't be causing the jumps becau
At 05:00 AM 8/3/2011, Magnus Danielson wrote:
On 08/03/2011 11:19 AM, Attila Kinali wrote:
Could be a measurement error (like losing ticks or something).
Have you ploted the difference between both? For me it looks as
the difference is (nearly) linearly growing over time, but it's
hard to tell
Here's the latest plot from my TEC test rigs. Y-axis is phase error
(in 60 Hz cycles), X-axis is time in MJD. The plot starts at 7AM local time.
http://n5tnl.com/tec/tec_test_01.png
Same serial connected embedded hardware, timestamped on the receipt
of first character. One machine (red line
At 04:50 PM 7/15/2011, Tom Van Baak (lab/iPad) wrote:
I've been told the NERC has decided to postpone their July 14
TEC-elimination test.
Sorry I don't have a URL with more information.
Their website has been updated:
http://www.nerc.com/page.php?cid=6|386
The TEC elimination field tests are
At 06:45 PM 7/23/2011, Don Latham wrote:
than a client. I looked up man ntpd, and it seems at first glance to be
a Linux/Unix client that will sync up a local computer. I want to
generate a network server that ntpd or other clients can access. Perhaps
ntpd is the server.
--
newell N5TNL
_
At 09:54 PM 7/3/2011, Tom Van Baak wrote:
This is about half a day from a webcam, taken at 15 minute
intervals by a PC, compressed to a 12 second animated GIF.
http://www.leapsecond.com/pages/tec/mains-clock-ani.gif
That's funny...I picked up a mains clock yesterday and started
something sim
At 01:24 PM 6/30/2011, Hal Murray wrote:
> Any advice on an easy way to convert my timestampts from time_t to mjd?
> I'm using C here.
It's trivial. All you have to do is offset by the difference in starting
days.
Got it working. Thanks!
--
newell N5TNL
___
At 01:31 PM 6/28/2011, Tom Van Baak wrote:
I'm planning on counting 60Hz line cycles with some embedded
hardware, then dumping the count over RS-232 every minute or so to
a linux box running ntp. Any thoughts on what data to log?
Scott,
You have a PC and RS232? Skip the embedded hardware.
At 02:14 PM 6/29/2011, Tom Van Baak wrote:
Out of curiosity, if anyone on the list has pointer to papers that
show actual measurements of desktop systems used as precise
timing devices let me know. Not external boxes or PCI cards, but
using the OS itself as a timer. I'm sure with care 1 us or ev
I'm planning on counting 60Hz line cycles with some embedded
hardware, then dumping the count over RS-232 every minute or so to a
linux box running ntp. Any thoughts on what data to log?
Obviously, the 60 Hz cycle counter.
Timestamp when data was received at the serial port? (It looks like
At 02:51 PM 6/20/2011, Javier Herrero wrote:
I was thinking the same... and also that Pease name was Robert A.,
not Ralph (and its usually signature was RAP)
How's this: Ralph had two stories to tell in that post. The first
was that he received an email from Bob Pease the night of the
accid
Here is a letter Bob wrote about Jim shortly before his death as posted by
one of the commentators from the below link:
Then he calls us to an awards meeting. I was only 19. He gives the new CEO
the triple humper award.He pulls a three cup bra from a shopping cart.
I saw that too, but the a
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