On 9/13/14, 7:33 AM, paul swed wrote:
Charles I literally just sat down to do some math. What you say is the same
thoughts I have. The information I have on NAA says that for 200bit msk its
a total of a 100 hz shift +/-50 Hz. That makes no sense I would think it
would be at least +/- 100 Hz.
On 9/13/14, 7:13 PM, paul swed wrote:
If NAA is transmitting 200 baud then I would expect the MSK carrier to be
+/- 100 Hz. Not +/-50 Hz.
I'd expect the total shift to be half the baud rate: 100 Hz..
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big oops at the minimum.
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On 8/14/14, 11:12 AM, mike cook wrote:
WOW! Guaranteeing compliance with FINRA OATS 7430 !
Here it is..
All computer system clocks and mechanical time stamping devices must be synchronized
to within three seconds of the National Institute of Standards and Technology (NIST)
atomic
On 8/10/14, 5:41 AM, Bob Camp wrote:
Hi
Keep in mind that it’s relatively cheap (big company wise) to get a patent. It’s only got
major value once the courts uphold it as valid. That process costs real money. I’ve seen
a variety of estimates on how many patents get issued that would never
On 8/10/14, 8:30 AM, Bob Camp wrote:
Hi
…. which also eliminates a full examination and challenge.
Bottom line as I still see it -
For Time Nuts one off / home use / zero profit/ personal
experimentation, I would not worry about the patents that are or are
not present on the
On 8/10/14, 9:26 AM, Kenneth G. Gordon wrote:
On 10 Aug 2014 at 6:24, paul swed wrote:
Hello again, Paul. Thanks for replying. Please see below.
On iPhone
Yes but those stations are fsk so the offsets an issue.
As I understand it from back in the 1970s when I was first working on this
sort
On 8/10/14, 11:54 AM, Mike Feher wrote:
Unless on what you were working on it had a different meaning, MSK means
Minimal Shift Keying. It is still a PSK modulation of any order, however
the transition between significant phase locations is not instantaneous,
but, shaped in various ways to smooth
Clarifying my previous question..
There's no doubt that multipath exists, and how to test is fairly
straightforward, whether with multiple antennas, cables, or waving
cookie sheets around..
What I was really asking is if anyone had observed this in the output of
their GPS receiver.
That
On 8/9/14, 9:33 AM, Magnus Danielson wrote:
Jim,
On 08/09/2014 05:31 PM, Jim Lux wrote:
Clarifying my previous question..
There's no doubt that multipath exists, and how to test is fairly
straightforward, whether with multiple antennas, cables, or waving
cookie sheets around..
Ultimately
On 8/9/14, 10:49 AM, Brooke Clarke wrote:
Hi:
I've been reading papers by Yingsi Liang who works for Xtendwave and she
seems to be the key person developing the new clocks.
I've starting collecting info on my web page:
http://www.prc68.com/I/Loop.shtml#PhaseMod
I don't understand how Xtendwave
. I think I would want to have some information
on license costs before I made that phone call though.
precisely so
Jim
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On 8/9/14, 3:49 PM, Bob Camp wrote:
Hi
That’s not the way it was presented to me. My understanding is that the case
law on proving “individual study” versus “individual use” is a bit murky. I’m
certainly no lawyer (thank goodness ..).
murky is a good way to describe it...
On 8/9/14, 12:27 PM, John Seamons wrote:
On Aug 10, 2014, at 5:49 AM, Brooke Clarke bro...@pacific.net wrote:
I don't understand how Xtendwave can get patents when their work was partially
funded by NIST?
We had this discussion a few years back:
On 8/9/14, 9:36 PM, Lee Mushel wrote:
Jeeze, Brooke, I wish you hadn't brought up the possible patenting of
Time Delay Beam steering antennas! I wonder if my highly esteemed SDR
radio which I think uses some such technology, is illegal?
long since expired..
(but, I gotta say that a lot of
Does anyone have a feel for what the minimum size reflector at some
small distance would be detectable on a GPS timing receiver? WOuld you
be able to see a change of a 1 meter square reflector 10 meters away?
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of mangling the pronunciations.
Jim
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freezing apparatus being
active. It should come to the freezing point till all of the ice melts.
Jim
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, or do I need to run the power to the antenna thru pin 1? And
can I hook up the same +3.3 to all three supply pins? Or should I hook
up a separate antenna supply, and assume the ground for that supply is
the pin 8?
Jim
From: jim s jwsm...@jwsss.com
To: time
Jim
http://leapsecond.com/pages/itrax/
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What channel was the transmitter on? I already have 2m and 220 capable,
looking for 6m or UHF.
Thanks 73,
Jim
wb4...@amsat.org
On 7/8/2014 1:26 PM, Dan Kemppainen wrote:
Hi All,
Was looking through my basement the other evening, and ran across an
OCXO I have laying on the bench. I
Hi,
I'm looking for a Datum 9300 time code generator and / or manual...
Thanks,
Jim
On Sat, Jul 5, 2014 at 2:44 PM, walter shawlee 2 walt...@sphere.bc.ca
wrote:
I am trying to make some space in a very over-crowded storage area here.
I have a very nice Fluke VLF receiver comparator, s/n 130 c
to again display time, but am only now getting to where I may
attempt to use his design and convert mine.
Thanks to Tom for letting me in, and I've learned a huge amount from
everyone here.
thanks
JIm
On 7/2/2014 9:42 PM, Bob Stewart wrote:
Jim,
I'm a rather junior member of the list, but I
On 7/2/2014 1:29 PM, Jean-Louis Oneto wrote:
Hello,
AFAIK, the differential variant of RS-232 is RS-485. I'm not sure about the
levels.
Best regards,
Jean-Louis Oneto
You have to control the direction of RS485. You don't have to with
RS232. One of the problems with support of RS485 in
, or
will the Primary power propagate and power the antenna?
The Antenna power is pin 1.
thanks
Jim
On 6/20/2014 8:31 AM, Tom Van Baak wrote:
Hi Ernie, Jason, (also Hal, Chris),
I'm able to get NMEA and 1PPS out of the Fastrax/iTrax130 board now.
Before I sink any more time into this project, have any of you
Jim
On 6/20/2014 8:31 AM, Tom Van Baak wrote:
Hi Ernie, Jason, (also Hal, Chris),
I'm able to get NMEA and 1PPS out of the Fastrax/iTrax130 board now.
Before I sink any more time into this project, have any of you made 1PPS
measurements?
Compared to ublox, using the same antenna, these units
that would be good.
Thanks
Jim
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attached?
Thanks to you both for answering.
jim
On 7/1/2014 9:30 PM, Bob Stewart wrote:
Jim,
Are you trying to find out how to hook up a receiver in your
office/radio room to an antenna that is some ways away? Or are you
specifically trying to remotely hook up a receiver near your antenna
On 6/3/14, 5:51 AM, Chuck Harris wrote:
nuts wrote:
Regarding radiation, I've used my Geiger counter at mile high altitudes
in Nevada and never got a count per second, even with the gamma shield
not used. You can look at the DOE CEMP stations:
1 Mile high is still on the ground compared
On 6/2/14, 1:55 AM, Tom Van Baak wrote:
Has anyone else noticed this? Or know about this? Please respond only if you
have real information. I can speculate as well as anyone; so it's solid
technical, RF, EMF, or composite carbon fiber engineering info I'm looking for.
I haven't noticed it
On 6/2/14, 2:27 AM, Poul-Henning Kamp wrote:
It would be trivial to add a passive GPS repeater to the plane, but
the airtraffic industry has never been happy about people being
able to receive navigation signals inside planes, worrying that
somebody might try to blow up the plane at some
Jeff:
Was really great to see you yesterday at BreezeShooters! Hope to see
you again soon, maybe better yet, chat on the air!
73,
Jim
wb4...@amsat.org
On 6/2/2014 6:11 PM, k...@aol.com wrote:
To the learned audience:
I agree that the 8410 is an excellent place to start to learn about VNA
On 6/2/14, 7:16 AM, Brian Lloyd wrote:
On Mon, Jun 2, 2014 at 8:57 AM, Jim Lux jim...@earthlink.net wrote:
O, and since navigation using the ADF and tuning to a AM
broadcast station wasn't unusual.
Well, it is quite unusual for IFR (instrument flight rules) operation. But
VFR pilots would
On 5/31/14, 5:48 PM, Bob Camp wrote:
Hi
A thousand chips at $1 a chip is a very different thing than a thousand chips
at $100 a chip. The next issue might be that they only have them in die form.
The issue after that probably is that you really want the version 3 (or 9)
chips that actually
On 5/30/14, 2:41 AM, Dr. David Kirkby wrote:
On 28 May 2014 14:06, Tom Holmes thol...@woh.rr.com wrote:
Which begs the question: just where the heck, exactly, is the center of
the
Earth given that it is in the 'middle' of a molten and dynamic core.
I always thought that the centre was
On 5/30/14, 3:00 PM, Hal Murray wrote:
[Structure of Earth's core]
jim...@earthlink.net said:
Molten, but it's a composite material under a lot of pressure, so the
transition between liquid and solid isn't like between ice and water.
Think cold peanut butter.
Seismic evidence is how
On 5/28/14, 6:04 AM, Tom Holmes wrote:
Which begs the question: just where the heck, exactly, is the center of the
Earth given that it is in the 'middle' of a molten and dynamic core. Are the
satellite orbits so stable and/or measurable around the center of
gravitational pull that the location
On 5/27/14, 9:21 PM, Chris Albertson wrote:
On 5/27/14, 10:24 AM, Brooke Clarke wrote:
BACK ON TOPIC... What does it take to measure ones distance from the
center of the Earth accurately enough to detect geological movement in
a reasonable amount of time? Measuring distance really is,
On 5/28/14, 2:11 PM, Tom Holmes wrote:
Thanks Jim.
So if, just for fun since this is time-nuts after all, I wanted to make a
similar measurement in my back yard here in the relatively stable Ohio,
would I be able rig something up to monitor the position changes? Obviously
a lot of averaging
On 5/27/14, 10:24 AM, Brooke Clarke wrote:
Hi:
Classical tide gauges measure the height of the water relative to the
gauge. But since the gauge is attached to a tectonic plate it's
elevation is changing.
This is one of the problems I have with the claim that sea level is
rising at 2mm per
I'm in the middle of implementing a lightweight time distribution system
using SpaceWire (a fast point to point serial link with simple routers
to build networks).
SpaceWire provides a special token called a timecode which propagates
from a tick source to various nodes, but that just provides
On 5/26/14, 11:13 AM, Magnus Danielson wrote:
Hi Jim,
On 05/26/2014 07:43 PM, Jim Lux wrote:
I'm in the middle of implementing a lightweight time distribution system
using SpaceWire (a fast point to point serial link with simple routers
to build networks).
SpaceWire provides a special token
On 5/2/14, 7:07 PM, Tony wrote:
On 03/05/2014 02:07, Edesio Costa e Silva wrote:
Welcome!
Take a look at NavSpark from SkyTraq (http://www.skytraq.com.tw/).
They had
an Indiegogo
(https://www.indiegogo.com/projects/navspark-arduino-compatible-with-gps-gnss-receiver)
campaign recently and
On 5/4/14, 8:40 AM, Chris Albertson wrote:
Looks like this is all you'd need for most timing projects. Just add your
favorite OCXO and some wire.
The SPARC (not Spark) is actually a step up from ARM. It was developed by
Sun Microsystems (now Oracle) it is optimized for things like fast
On 5/4/14, 10:07 AM, Bob Camp wrote:
Hi
Well some of us still have RSX-11M (and RSTS/E) code floating around …..
B
As do I, but the stuff I'd actually reuse is pretty OS independent
(signal processing code in FORTRAN, and in reality, I'd most likely
rewrite it anyway.)
I suspect you'll
On 5/4/14, 11:38 AM, Chris Albertson wrote:
These guys claim IEEE-754 FPU. But this is not the board to use for a
Posix-like OS. For that you'd want disk controller, networking and so on.
Ah, so they did include the FPU: that's handy.
Actually, an in-ram file system, along with a decent
On 5/4/14, 11:44 AM, Bob Camp wrote:
Hi
Well I do have those Sparc machines sitting over in the shed ….. I
suspect hauling over the CRT monitor to go with it would be a bit of
a pain. I doubt I would win the “low power GPSDO of the year” award
with it.
Like it or not, once you get to 64
. I am using
the Adafruit antenna outdoors, with a view of about half the sky, looking
east.
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?
Or is an external delay line or TIC plus software the only way?
Thanks
jim ab3cv
On Sat, Apr 26, 2014 at 7:59 PM, Jim Miller j...@jtmiller.com wrote:
I'm reading though the manual for my recently acquired M12+T which I'm
looking forward to using.
I notice that the manual is dated 09FEB05.
So
distracted all investment from timing receivers
except at the high end?
Thanks
Jim AB3CV
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.
The anomaly in the microwave component business is the hobby guy or
gal who buys 2-3 pieces for a project, puts it on the shelf until they
get around to doing the project 6-12 months later, and never buys again.
Jim
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On 4/24/14, 11:43 PM, Magnus Danielson wrote:
Jim,
On 04/25/2014 05:32 AM, Jim Lux wrote:
On 4/24/14, 6:26 PM, Said Jackson wrote:
Hi Magnus, Bob,
Thanks much for your kind words.
The failure rate is thankfully so low that we are not greatly alarmed,
and Microsemi has been a champ
Out of curiosity, what's the current price for one of these for a time-nut
to play with?
Regards,
Jim Palfreyman
On 25 April 2014 11:26, Said Jackson saidj...@aol.com wrote:
Hi Magnus, Bob,
Thanks much for your kind words.
The failure rate is thankfully so low that we are not greatly
prompts a is it the
failure...
Good luck..
JIm
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On 4/17/14, 11:09 AM, Lester Veenstra wrote:
The classic DIY test of material for RF use is give it 60 seconds in a
microwave oven.
If it gets warm, it’s not a good candidate.
that's fine if you're looking for a gross measure of suitability.
If you're concerned about things like dielectric
I've opened up my Casio G-Shock watch, found an electrical point, put an
oscilloscope on it and successfully adjusted it. From memory the frequency
was something weird, but I still tuned it successfully to within about a
second a month. I even think I posted to time-nuts on this...
Jim Palfreyman
On 4/15/14, 8:16 PM, nuts wrote:
I don't use the surf board resin. I use
http://www.tapplastics.com/product/fiberglass/polyester_resins/tap_marine_vinyl_ester_resin/34
I don't have specifics on what Tap sells, but vinyl ester resins have a
dielectic coeficient around 4 and dissipation of at
On 4/15/14, 1:53 AM, nuts wrote:
I'd be inclined to look at radome construction.
http://www.mpdigest.com/issue/articles/2008/may/mfg/default.asp
The E-3 AWACS is mostly S-2 glass, but they need the strength. For a
radome sitting outside, you might be able to do better.
Radome design is
On 4/15/14, 8:13 AM, ewkeh...@aol.com wrote:
Working off list on a super high performance GPSDO but low cost thanks to a
time nut (sorry forgot his name) he directed me to DX.com which have ublox
with antenna for lwss than $ 23. Super performance and though they are out
of the one with 1 pps
On 4/15/14, 11:02 AM, ewkeh...@aol.com wrote:
The Gerber Baby Food Jar at Wall Mart $ 0.49
Is there a particular kind of food that works best? Perhaps strained
prunes has the best regularity?
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On 4/14/14, 12:11 PM, ewkeh...@aol.com wrote:
Am experimenting with small low cost GPS antennas and am considering as an
alternative RTV/silicon. Any information on RF attenuation of RTV/silicon
at 1.6 GHz ?
Are you potting the antenna in a solid mass of silicone? Or using it to
seal an
On 4/12/14, 12:50 PM, Bob Camp wrote:
Hi
I’ve been working with some friends on an ARM based Arduino project. The
support for ARM in the Arduino tool chain is still not really up to speed. It’s
actually been faster / easier to take the stuff we need over to another board
and tool chain than
are driving it with the same frequency ad the same phase it
naturally oscillates at
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of it.The steps are less
than I can measure
What TIC capacitor did you use. If it is that temperer sensitive you
might want to replace it.
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works in North America. I don't know details elsewhere, but the
PMTK313 message says it turns searching for SBAS satellites on and off.
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On 4/10/14 2:38 PM, Hal Murray wrote:
Does anybody have a favorite low-cost ARM board? I'm looking for a simple
Arduino like setup rather than something that runs Linux. The idea is to get
32 bit counters so a bunch of the recent discussion can be ingnored.
teensy3.1.. ARM Cortex M0 in the
Jim/Chris
Thanks for the connector/cable info.
Regarding the battery:
I used a 2032 coin cell battery and holder I un-soldered from an dead PC
motherboard.
Even a coin cell will last its shelf life at least.
According to the manual the module is designed for a rechargeable type
while
. If this works, it is a cosmetically and
functionally perfect solution. I'll report back after I've tried it.
The switches I picked are 6x6x10.5mm Tactile Pushbutton Switches,
ebay item 161008571229,
Jim
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On 4/3/14 8:17 PM, Chris Albertson wrote:
I just read about a discovery of a liquid water ocean on Saturn's moon
Enceladus. The method used was to measure the velocity of a
spacecraft as it makes a close fly-by. Gravitational anomalies will
cause the spacecraft to speed up or slow down as it
On 4/3/14 11:17 PM, Chuck Forsberg WA7KGX wrote:
One needs to know the carrier frequency. Must be a high quality reference
for the Cassini transmitter.
Two way measurements are most likely here (although Cassini does carry a
USO). So the downlink is locked to the uplink which comes from a
On 4/4/14 4:30 AM, Bob Camp wrote:
Hi
Back when they were designing this stuff, they were very interested in getting
into the parts in 10 to the 15th. They didn’t get there, but that was the
desire.
Roughly that...
http://lasp.colorado.edu/~horanyi/graduate_seminar/RSS.pdf is a good
On 4/4/14 7:39 AM, Bill Hawkins wrote:
Jim,
Thanks for sharing the details and preventing this subject from turning
into shared ignorance.
It was working on this kind of thing that led me to time-nuts in the
first place..
Deep Space nav is probably one of the most precise measurements made
On 4/4/14 5:01 AM, Dr. David Kirkby wrote:
On 4 Apr 2014 08:55, Tom Knox act...@hotmail.com wrote:
90 microns is approx a freq res of about 1 x 3.66 -12
Thomas Knox
Since the Doppler shift is prortional to the frequency, I can't see how
one can determine the absolute frequency.
But
On 4/4/14 9:34 AM, Chris Albertson wrote:
On Fri, Apr 4, 2014 at 6:19 AM, Jim Lux jim...@earthlink.net wrote:
Radio science and navigation measurements are quite impressive in their
accuracy and attention to detail. measuring range to cm (out of a billion
km, i.e 1 part in 1E14) and velocity
On 4/4/14 9:58 AM, Alex Pummer wrote:
gravitation measurement, particularly gravitation measurement in space
is based on the Eotvos -effect see here:
http://en.wikipedia.org/wiki/E%C3%B6tv%C3%B6s_effect and here:
http://en.wikipedia.org/wiki/Lor%C3%A1nd_E%C3%B6tv%C3%B6sand from
the begin
header.
Thanks
Jim ab3cv
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On 4/4/14 6:51 PM, Chris Albertson wrote:
The data connector is a standard 0.05 inch double row of male headers.
These are common but not nearly so common as the 0.1 type. I used a 2032
coin cell battery and holder I un-soldered from an dead PC motherboard.
Even a coin cell will last its shelf
On 4/4/14 5:45 PM, paul swed wrote:
I mean no disrespect to anyone here. Jacksonlabs makes some very fine
components. Brookes comment was spot on. What happens etc. I did run out to
the site and take a quick read. The short piece I read did not have a lot
of specifics or I simply missed them. It
I've got some GPS-18x LVC units i'm using for a time reference, and
they're showing an odd behavior: the position isn't updating.
I moved them across the US (from Los Angeles to the east coast), and
when I powered them up here, it's returning the LA Lat/Lon (34N,118W),
the (reasonably
On 3/27/14 8:53 AM, David J Taylor wrote:
From: Jim Lux
[]
Has anyone seen a similar behavior? I've tried the power cycling, and
the Garmin reset command. I've not done the clear non-volatile
memory which makes it forget the almanac.
===
What
On 3/27/14 4:10 PM, Tom Van Baak wrote:
Recently I happened across an eBay listing for an Antelope Audio
Isochrome, a device that apparently packages an SRI-PRS10 rubidium
oscillator and distribution amplifier in a box and sells to
audiophiles for a price in the
True, the PRS10 is a better
Thanks for all the helpful replies!
Lots to learn.
73
jim ab3cv
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On 3/24/14 10:18 PM, David McGaw wrote:
I am surprised it took them this long. A number of satellite telemetry
systems can use doppler as a matter of course for locating transmitters,
such as Iridium and Argos.
Those are actually designed for measuring Doppler..
That's really the difference..
On 3/25/14 11:38 AM, J. Forster wrote:
Could well be. I never saw the bird, of course. The portable ground
station was roughly the same size as an OD Manpak radio of the period and
read out Lat/Long on LED digital readouts. In retrospect, it may have been
in the early 1980s.
Transit,
baffled as to how one would do this in software without a ton of
expensive hardware to give phase information. Could you provide in words a
simple block diagram of where you would get phase information without a Ghz
TIC to read?
Thanks
Jim
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a few simple indicator lights for status.
Jim
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Bob
I'm not sure who you're responding to but I have a couple of questions:
TDC = Time Delay Correlator?
Could you point me to one of these 50 cent threads? I've read a ton of this
list from 2007 forward but must have missed that.
Thanks
jim ab3cv (much to learn)
Hi
There have been multiple
On 3/23/14 10:48 AM, Paul wrote:
On Sun, Mar 23, 2014 at 1:08 PM, Bob Camp li...@rtty.us wrote:
I suspect that what NIST is looking for is somebody in the cloud business
(Amazon, Google, Microsoft, IBM) to step up and mention that they have
2,989,875 server racks scattered about the world and
is actually much
smaller than 128ns, ie more like 1/4th of that then the DS1123 with 0.25ns
granularity and much smaller range might have better integral linearity
performance.
73
jim ab3cv
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On 3/24/14 6:15 PM, Chris Albertson wrote:
Yes, word is that they were able to determine the Doppler shift in the
plane's signal. I'm surprised this was even recorded but it must have been
in the satellite's telemetry downlink. Projecting radial velocity and
constraining it to be close to the
in the data that has not been
corrected for sawtooth.
Am I correct?
Thanks
jim ab3cv (still learning...)
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will result in
oscillation unless a zero is inserted (the P in PID).
How would stability be maintained?
Thanks
jim ab3cv (newbie...)
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supplies.
Finally gave up shut it off. Another time.
Hoping to see some ideas . . . . .
73,
Jim
wb4...@amsat.org
On 3/23/2014 3:45 PM, John Stuart wrote:
I just bought my second HP Z3805 (this one has a 12 ch. receiver) and have
been monitoring it with Ulrich Bangert's Z38XX software tool.
Last
On 3/21/14 8:52 PM, nuts wrote:
On Thu, 20 Mar 2014 14:42:42 -0400
Joe Leikhim jleik...@leikhim.com wrote:
I just red somewhere that the last ping was the only one recorded
by Inmarsat system, Pings up to that point were presumed to occur due
to known reporting intervals. So there is no track.
On 3/19/14 9:50 AM, Chris Albertson wrote:
So they want to in-invent NTP?
I think NTP already services way more than 6.5 billion per day. The
problem with NTP is while it is nearly optimal and provides the best
time accuracy for a given hardware/network setup it is not technically
traceable
On 3/20/14 12:07 AM, Poul-Henning Kamp wrote:
In message 279331507.5734621395275538874.JavaMail.actor@webmail5, iovane@inw
ind.it writes:
My question was on what would be the expected accuracy of the circle's radius.
Projected onto the surface of the earth, the uncertainty leaves a band
On 3/20/14 8:53 AM, Poul-Henning Kamp wrote:
In message 40280C39FE7D43C79313A1755BCAF58D@StanleyPC, Stanley writes:
Would think they have many other aircraft with known position stationary or
moving with location known to help improve the estimate.
They might have been able to do that while
On 3/18/14 10:18 PM, Tom Van Baak wrote:
If you can design a system that can handle 6.5 billion requests per day, this
opportunity is for you...
https://www.fbo.gov/spg/DOC/NIST/AcAsD/RFI_InternetTimeServiceComments/listing.html
Solicitation Number: RFI_InternetTimeServiceComments
For
Original Message
Subject: Re: [time-nuts] NIST time services
Date: Wed, 19 Mar 2014 10:21:17 -0700
From: Jim Lux jim...@earthlink.net
To: time-nuts@febo.com
On 3/19/14 9:50 AM, Chris Albertson wrote:
So they want to in-invent NTP?
I think NTP already services way more than
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