On 9/24/11 1:58 AM, Magnus Danielson wrote:
It would be interesting to see what a combination of mutual
synchronisation within a constellation and central synchronisation would
yield. Your constellation would maintain contact with each other and
pull eachother to some form of average time
On 9/23/11 4:15 AM, Peter Gottlieb wrote:
I was just wondering, what real use is the kind of accuracy most of the
list members strive for, and there is the answer.
I can give you some other day to day practical uses of what gets
discussed on this list:
- radio science in deep space
Here's topic that I hope will provoke some useful discussion (and maybe
the problem has already been solved?)
I'm working with a software defined radio (SDR) for spacecraft which
conforms to a new architecture standard for such radios ( referred to as
STRS) (and I'm also one of the authors
On 9/23/11 8:35 AM, Poul-Henning Kamp wrote:
Take a look at FreeBSD's timecounters, what you are asking for
sounds pretty much like what I did 15 years:
http://phk.freebsd.dk/pubs/timecounter.pdf
I used a 32.64 internal format, to avoid rounding errors, particularly
in your k1 term.
On 9/23/11 10:04 AM, Jose Camara wrote:
I think you are right, often the internal, free running osc will give you
better results. You can use the GPS or rubidium to calibrate the internal one
just before you need some more accurate absolute frequency measurements on the
SA.
It will depend on
On 9/23/11 10:13 AM, Poul-Henning Kamp wrote:
In message4e7cbca1.9010...@earthlink.net, Jim Lux writes:
What I'd like to do is take the next step beyond what you promulgated
with a representation of time and the conversion between count and time
with a linear equation.
I'd like to propose
On 9/23/11 10:25 AM, Jim Lux wrote:
One aspect of why at least a standardized second order model would be
nice is that it allows you to make smooth non-discontinuous changes in
rate. the transformation from count to time would be discontinuous in
rate of rate (i.e. it would go from zero
On 9/23/11 10:50 AM, Chris Albertson wrote:
I'd like to propose a standard description of a higher order model of
time and the transformation between raw clock and time (in some agreed
upon time scale).
A good time transform will let you transform between time scales at
points in the far
On 9/23/11 10:54 AM, Brooke Clarke wrote:
Hi Jim:
Do you know how the HP/Agilent 4395A stacks up as a SA? I really like
the true RMS power detection and the 1 Hz RBW (not video).
On 9/23/11 1:23 PM, Brooke Clarke wrote:
Hi again:
What is the speed of light in rock?
that's a really interesting question, because it's not like a EM wave
propagating, where the dielectric constant is what you care about.
OTOH, I suppose that since EM waves are also photons, there must
On 9/23/11 1:45 PM, Poul-Henning Kamp wrote:
In message4e7cdeb0.8070...@earthlink.net, Jim Lux writes:
Actually, the really annoying one is where I have a good clock that's
stable, but I need to keep adjusting time to match someone else's
terrible clock. Most clock disciplining/time
On 9/23/11 2:00 PM, Chris Howard wrote:
Seems like a lot of unknowns. You would have to
have sensors monitoring the sensors.
I think the clock model (insofar as variations in the oscillator) are
outside the scope, as long as the effect of that variation can be
represented cleanly.
For
On 9/23/11 2:24 PM, Chris Albertson wrote:
On Fri, Sep 23, 2011 at 12:32 PM, Jim Luxjim...@earthlink.net wrote:
On 9/23/11 10:50 AM, Chris Albertson wrote:
Yes, in the general case, but in the spacecraft case, I think we're more
concerned about smoothness and such over time spans of days,
On 9/23/11 4:01 PM, Poul-Henning Kamp wrote:
In message4e7d0353.2040...@earthlink.net, Jim Lux writes:
But as we move towards constellations of spacecraft with LONG light time
to earth, that whole time correlation process needs to be done
autonomously. So the process of converting local count
On 9/22/11 10:34 AM, NeonJohn wrote:
On 09/21/2011 04:57 AM, David C. Partridge wrote:
Howsabout HFC-236fa - very similar properties to R114 but not banned.
Tektronix used a Freon in their 40 KV High Voltage probes. The Vapor
pressure of some of those compounds is low at 70F, but they do
top posting works very nicely with mail clients that have a preview
screen, as well. And, yes, the whole threading thing gets implemented
in a variety of ways (even within the same product). I use, variously,
thunderbird, Outlook, Outlook Web Access (OWA)-lite via Firefox/Safari,
the iPhone
On 9/20/11 11:39 AM, Dick Moore wrote:
Is there a relatively inert gas that has much higher thermal conductivity than
air? Then a flask makes sense and is not the size of the basement...
Helium
___
time-nuts mailing list -- time-nuts@febo.com
To
On 9/20/11 12:46 PM, J. Forster wrote:
Likely one of the Freons (TM) or Sulphur Hexafluoride.
Tektronix used a Freon in their 40 KV High Voltage probes. The Vapor
pressure of some of those compounds is low at 70F, but they do have to be
sealed.
Unfortunately, virtually all Freon useage has
On 9/16/11 5:56 AM, Luis Cupido wrote:
Just read this one...
I just wonder if I did anything that terrible in a past life to
deserve reading this ... ;-)
Recently on Microwaves and RF.
http://mwrf.com/Articles/ArticleID/23644/23644.html
lc.
ct1dmk.
Yes, Luis... you are clearly a very bad
On 9/13/11 3:10 PM, gary wrote:
since they trespassed on my
land (undeveloped) to place a satellite cross mark for a shoot. Needless
to say I was pissed to see the big X on google earth, though now I have
free pointers for NEWS. The while paper had mostly rotted away.]
tangential to time nuts
On 9/13/11 4:24 PM, li...@lazygranch.com wrote:
I think I mentioned this is a thread one before. If you are really interested
in position accuracy, you look up a calibrated point from the USGS that you can
safely and legally access, then take a reading. I say safely because many
points are in
On 9/11/11 3:14 PM, gary wrote:
Since Demming is also the father of SPC, I'd like to know the context of
that statement.
I'll find it.. but I think it's in the context of the process has to be good
On 9/11/2011 2:10 PM, Jim Lux wrote:
On 9/11/11 12:20 PM, J. Forster wrote:
ears ago
On 9/10/11 8:57 AM, Magnus Danielson wrote:
On 10/09/11 05:15, Richard (Rick) Karlquist wrote:
This article was in the PTTI proceedings around 1990.
Highly recommended.
This article might be what you refer to:
http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2doc=GetTRDoc.pdfAD=ADA515384
On 9/10/11 9:38 AM, Magnus Danielson wrote:
Probably, but the horology server seems to have gone offline, which is
sad since it was a good place to find almost all of Greenhalls papers.
Interesting.. I just checked inside the firewall, and the hostname isn't
valid (so it's not just that it's
On 9/10/11 3:20 PM, Tijd Dingen wrote:
Same here. Does anyone know of an alternative source for that paper by Oliver
Collins? I was trying to make sense of Bruce's generalization of the hard
limiter, but found that to be a bit tricky without original paper...
On 9/9/11 6:37 AM, ehydra wrote:
Hi Bruce -
Do you have a reference to read on for this?
I imagine that's the standard cascade of limiters used in zero crossing
detectors..
google for JPL and Greenhall to get started. I can't remember the exact
cite (or even if Greenhall was one of the
On 8/30/11 12:40 AM, Chris Albertson wrote:
How is the speed of light accounted for in the definition of UTC?
00:00:00 UTC is the same time everywhere. propagation only affects it
if you are transmitting a signal based on UTC. If I send a signal at
00:00:00 UTC from LA to Greenwich,
On 8/27/11 7:45 AM, Tom Van Baak wrote:
I can't say the same for carbon (C14) or potassium (K40). See
http://en.wikipedia.org/wiki/Banana_equivalent_dose
Hmm, clocks based on the decay of C14 or K40... Definitely the other
end of the timing spectrum from picoseconds.
But think about
On 8/27/11 8:22 AM, Brian, WA1ZMS wrote:
Can anyone recommend a goid commercial grade freq ref synth that will generate
a 10MHz output range with .1Hz step sizes based on a 10MHz ref? Agilent sig
gens are not a good fit for this application. Would like a 1 RU high compact
box with PC
On 8/14/11 8:10 PM, Paul Cianciolo wrote:
Folks,
I amtrying to understand some of the terms used here quite often.
I quoted this from Wikipedia
An Allan deviation of 1.3×10−9 at observation time 1 s (i.e. τ = 1 s) should be
interpreted as there being an instability in frequency between two
On 8/15/11 8:07 AM, Ulrich Bangert wrote:
Jim,
pardon to correct you but
no apologies needed..
It's if you measured the frequency (instantaneously) at one second
intervals, and calculated the standard deviation, that would be the
ADEV for tau=1 second.
is simply wrong in at least two
On 8/4/11 9:08 AM, Dave M wrote:
hn
BAMA is kinda strange nowadays. According to the note on the edebris
mirror page, the main BAMA site has been down for repairs and upgrades
since 9/17/2009; almost 2 years ago. Will the main site ever come back
online, or has it been written off permanently?
On 8/2/11 10:47 PM, David J Taylor wrote:
That said of all the systems I like the Mayan one best. They defined
the year as 360 days. Then after 360 days they stopped counting and
had a party while they waited for the priest to watch the sun and
declare the start of a new year. They got a week
On 8/3/11 12:14 PM, J. Forster wrote:
Hi Brooke,
Maybe. The photon counting gear is pretty trivial. You'd need:
A scintillator
A PMT (Photo Multiplier Tube) and HV stable HV PS.
A preamp
A SCA (Single Channel Analyzer). These can be built.
A counter, stable time base, and data recorder
The
On 8/3/11 2:20 PM, Brooke Clarke wrote:
Hi Jim:
The problem I'm having is that just counting the clicks from a source is
a way to get random numbers. If you average the clicks over a large
amount of time and plot that average, it will decrease over time. So to
see the change in decay rate the
On 7/23/11 9:42 AM, Bob Camp wrote:
Hi
The simple answer is that normal NTP via the net will give you accuracy similar to the
zero beat to WWV approach. It will take a few days to get to that level. Much
faster to fire up the radio and use WWV.
Bob
If you aren't somewhere that has no
On 7/22/11 11:59 AM, Chuck Forsberg WA7KGX N2469R wrote:
On 07/22/2011 11:48 AM, Javier Herrero wrote:
El 22/07/2011 20:39, michael taylor escribió:
I think all NTP server appliances have this functionality by their
nature, whether or not the oscillator is of particular high quality
(low
On 7/22/11 3:46 PM, brent evers wrote:
After that all you need to do is write some code to...
Oh - if I had a nickel for every time I've heard that!
Brent
When I worked in the physical effects business, we'd get a set of
storyboards from a director, and we'd have to figure out how we were
On 7/14/11 10:54 PM, Poul-Henning Kamp wrote:
In message3209.12.6.201.213.1310686158.squir...@popaccts.quikus.com, J. For
ster writes:
If you got all the Chinese to just stand on a chair, it would increase the
Moment of Inertia of the earth a smitch, and it would slow the rotation
because of
On 7/15/11 12:10 AM, Hal Murray wrote:
Does anybody have a good graph for summer vs winter? I'd expect snow loading
might be big enough to show up.
This is the kind of thing that Richard Gross at JPL fools with. As I
recall, atmospheric drag changes on a cyclical basis too. And
On 7/15/11 12:48 AM, Tom Van Baak (lab/iPad) wrote:
1E14 we might be able to notice
Hal,
No. Look at the adev of the earth (earlier posting). The length of earth day
varies in the *milli*second range, day to day. VLBI measurements are under 0.1
millisecond, which comes to about 1e-9
On 7/15/11 3:17 AM, Steve Rooke wrote:
Well, instead of leap seconds which seem to be the biggest bug bear
for everyone, keep the second as 1/86,400 of the earths current
rotation and adjust the factor used in the calculation of atomic time
on a regular basis. No more leap seconds just leap
On 7/14/11 6:08 AM, Steve Rooke wrote:
It's a shame these, and other elderly scholarly works, can't just be
released for the greater good, without all this red tape tying them
down. I wonder how much better the world would advance if we could all
go back to the days when we shared knowledge and
On 7/14/11 6:40 AM, J. Forster wrote:
So?
That statement clearly imlies the Earth's period was shortened aganst some
standard.
If the Earth was the standard, how could it be shortened with respect to
itself?
It can't be. Time standards are atomic now.
-John
You've raised an interesting
On 7/12/2011 at 9:04 PM Bill Dailey wrote:
Ok, I have a dds receiver locked to a gpsdo, the radio can only be tuned
in 1 hz increments but should be dead on. I can feed the passband into
speclab via VAC and measure a carrier OTA. No problem there...can get
decent resolution but there is
On 7/13/11 5:55 AM, paul swed wrote:
hp3335 then as I sent last night
or 3325... we use a lot of them at work. takes a 10MHz input, settable
to microhertz, etc.
On Wed, Jul 13, 2011 at 8:38 AM, Bill Daileydocdai...@gmail.com wrote:
Thanks for the input. I think i am asking for too
On 7/13/11 6:55 AM, J. Forster wrote:
there is a Yahoo Group, MIT-Rad-Lab-Books where you might get lucky on the
missing volumes.
There was a complete, scanned set on two CDs around also. The copyright
status is unknown though.
Have to check for sure, but they might be non-copyright. Were
On 7/13/11 8:02 AM, J. Forster wrote:
That is apparently the case for the HC books.
I'm not so sure about the CDs. A friend who is an IP attorney has told me
that if you scan something, you cannot copyright the scan. You can
copyright any new content you add.
And you could copyright the
On 7/13/11 8:05 AM, jmfranke wrote:
The original series was copyrighted 1947 by McGraw-Hill Book Company.
The agreement with the government was the copyright would later be
lifted. I know in 1964 the grey colored small size book series were
printed by Boston Technical Publishers, Inc. with no
On 7/13/11 12:13 PM, Chuck Harris wrote:
I can conceive of a case where a publisher like McGraw-Hill's
copyrighted book
full of public domain IP could be copied if you used your own type font,
and
formatting of pages, pictures and text, etc...
This is precisely the case with West Publishing
On 7/12/11 1:01 PM, Chris Albertson wrote:
Soubnds good if you have a computer GPIB interface. I don't. Which
is the best one at a reasonable price?
I use the prologix ones (Ethernet flavor)..
Brand new, there's several makes to choose from.. last I checked,
they're in the $100-200 range.
On 7/12/11 5:41 PM, Bill Dailey wrote:
Looking for recommendations for a broadband synthesizer with external
reference connection, at least 1mhz to 1ghz with micro to millihertz
resolution. Oh yeah under $1000 or so. I found a real nice one
from holzworth but it is about $5k which is a bit
On 7/10/11 12:56 PM, Marco IK1ODO wrote:
At 18:54 10/07/2011, Ed wrote:
I agree that the extra converter is to provide isolation and input
voltage flexibility.
Thanks to all that answered my questions; very interesting thread.
Possibly only input voltage flexibility and EMC considerations,
On 7/9/11 7:49 AM, Marco IK1ODO wrote:
Hello Paul,
thanks for info. Another list member gave me two good links: KO4BB has
the schematic of PS board (!) in
http://www.ko4bb.com/cgi-bin/manuals.pl?dir=05)_GPS_Timing/Z3801/Z3801A_Power_Supply
and there are some more info in
On 7/9/11 8:31 AM, Bob Camp wrote:
Hi
Guess 1:
Design it all with the first set of switchers, run it through all the fancy do
them one time tests. Get to the last test, fail. Project is now well behind
schedule.
What's the fast fix? Slap on a wider range / lower emission / better isolation
Seemed like a time-nuts-y sort of thing:
http://www.latimes.com/entertainment/news/la-et-turan-notebook-clock-20110708,0,4924534.story
This is how The Clock works. In every city it plays, the screenings
are synchronized to local time. At least once in every minute, there is
a shot of a
On 7/4/11 11:47 AM, Javier Herrero wrote:
Hello all!
I'm in the need of a network analyzer, and after some considerations
about the different available options, I think that the unit that best
suits my present and near future needs would be an 8510C system (well,
surely a new PNA-X would
On 7/4/11 1:40 PM, Javier Herrero wrote:
Hello, Jim,
Again for now, no extensive frequency precision, so would be suitable. I
suppose that this is valid with the 8350B sources, but does it operates
in the same way with an 8340 synthesized sweeper, or in that case it
commands the frequency
On 7/2/11 4:12 PM, Shane Justice wrote:
Hi All,
I have an ebay special TrueTime XL-DC that seems to work fine, only
thing is, I pulled the lid and found one of the BNC's was not connected
on the 87-601 board, and would like to know what the jumper/plug
arrangement is. (some BNCs have a black
On 7/2/11 4:12 PM, Shane Justice wrote:
Hi All,
I have an ebay special TrueTime XL-DC that seems to work fine, only
thing is, I pulled the lid and found one of the BNC's was not connected
on the 87-601 board,
Is your XL-DC a 600,601, or 602?
As I recall..
600 has blank front panel
601 has
On 6/29/11 9:21 PM, Daniel Schultz wrote:
http://nutsvolts.texterity.com/nutsvolts/201107?pg=12search_term=symmetricom#pg12
http://www.symmetricom.com/products/frequency-references/chip-scale-atomic-clock-csac/SA.45s-CSAC/
SA.45s CSAC
An unmatched combination of breakthroughs — in reduced
On 6/30/11 2:26 PM, Charles P. Steinmetz wrote:
The Working Group final report on the LightSquared--GPS interference
issue has been released. You can download it using the FCC's ECFS
electronic comment filing system. It is posted in 7 parts totaling 1,035
pages:
ALso at
On 6/27/11 9:43 AM, Mark Spencer wrote:
I'm not sure if the results I am seeing are valid or not.My signal source
is a 16 volt doorbell transformer that feeds a voltage divider which in turn
feeds my 5370B with an approx 2 volt sine wave. Setting the trigger point on
the 5370B to 0 volts
On 6/25/11 5:03 PM, Neville Michie wrote:
An interesting question about making a 50/60 hertz source,
Does a 120 to 12 volt transformer have enough inductance to use as a 12
to 120 volt transformer?
Remember, the inductance is proportional to the square of the no of
turns, where as voltage is
On 6/26/11 8:34 AM, Alberto di Bene wrote:
A simple way to measure the line frequency (up to a given precision...)
is to watch on a waterfall program to one of its harmonics.
In the following picture you can see the 53rd harmonic of the 50 Hz line
frequency in Italy. It was captured by just
On 6/26/11 10:38 AM, Poul-Henning Kamp wrote:
My idea for measuring this, was to measure the time from the
utc second from a GPS receiver to the first zero-crossing of
the grid, and try plot Magnus and my measurements together.
So, to make this easy on folks..
Seems the easiest PC hardware
On 6/26/11 6:29 PM, Thomas A Frank wrote:
On Jun 25, 2011, at 7:31 PM, Jim Lux wrote:
although it's a lot easier if one of the links is down and they're running with
the ocean return path.
Ocean return path? Please say more.
I picture a gigantic carbon electrode stuck in the ocean
On 6/26/11 8:23 PM, Jim Lux wrote:
I just have to look for a set of towers with a single duplex cable.
(actually a bit of googling found a report
www.kentercanyon.org/index.php/download-public-docs/doc/25/raw
)
OK.. the electrodes are about a mile off shore from Gladstone's-4-Fish
on PCH
Extrapolating further, I wonder if anyone has done common view
time transfer based on synchronized power grids? Although not
as precise as LF or TV or GPS methods it would make a nice
demo of the concept.
/tvb
Interesting idea.. but here's a potential wrench in the works.. the
phase in the
On 6/24/11 6:47 PM, Hal Murray wrote:
I don't see how they connect grid that aren't totally in sync.
Each grid is in sync with itself. In the US, there are several grids. They
aren't connected except maybe by DC lines.
all of the US is interconnected, except for Texas.
That said there's
On 6/24/11 8:20 PM, Chris Albertson wrote:
On Fri, Jun 24, 2011 at 5:59 PM, garyli...@lazygranch.com wrote:
I use a Logitech Squeezebox radio in the bedroom. Network timed!
I don't see how they connect grid that aren't totally in sync.
The big long distance transmission lines are high
On 6/24/11 9:22 PM, Jim Lux wrote:
On 6/24/11 8:20 PM, Chris Albertson wrote:
On Fri, Jun 24, 2011 at 5:59 PM, garyli...@lazygranch.com wrote:
I use a Logitech Squeezebox radio in the bedroom. Network timed!
I don't see how they connect grid that aren't totally in sync.
The big long
On 6/22/11 3:36 PM, Luis Cupido wrote:
I knew I must not have been the fist one to be looking for such.
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4014919
(unfortunately I'm not ieee member and $30 looks more like a
book price to me... not an article... bahhh!)
Luis Cupido.
On 6/21/11 6:14 AM, dk...@arcor.de wrote:
There is an excellent article about cordic on
http://www.andraka.com/files/crdcsrvy.pdf
Yes..good explanation..
So, in the general case where you might want to rotate by an arbitrary
angle at each time step, where the angle doesn't happen
Ohh..
It just came to me..
You're not using CORDIC as a replacement for both the phase accumulator
and cos LUT, but JUST instead of the LUT, so you ARE doing the give me
cos(theta) on every sample.
So then, it's a trade between a big ROM LUT or a bunch o'gates for
CORDIC. And for big N the
On 6/21/11 9:38 AM, David Martindale wrote:
16 bits in is 64K *entries* of 16 bits each, a total of 1 megabit of
ROM. The usual 90/180 degree folding could reduce that to 256 kbit.
Dave
On Tue, Jun 21, 2011 at 7:49 AM, Jim Luxjim...@earthlink.net wrote:
So then, it's a trade between a
On 6/20/11 7:46 AM, Luis Cupido wrote:
Folks, a quick one...
A DDS, that is an accumulator with a DAC followed by a low pass filter
and comparator (zero crossing) to produce a square wave to drive a PLL
or a MIXER or else (at logic levels).
Isn't it the very same thing as just using the most
On 6/20/11 8:39 AM, Luis Cupido wrote:
Well, if we really need to filter it out
we better filter the MSB and square it
again...
Why having a DAC for ???
Spur content heading into the filter.. the sine table and DAC greatly
reduces the harmonic content of the output, which makes filtering
On 6/20/11 9:46 AM, Luis Cupido wrote:
Gracias, Javier.
As you read in my previous email I'm basically
worried about close-in spurs (those that
will pass through the PLL loop filter).
will digest that 4th section... tks.
...
Since I'm inside an FPGA... I'm eager to get
spurs down without
On 6/20/11 12:17 PM, li...@lazygranch.com wrote:
Just a FYI, you don't have to use sine lookup tables. You can generate sine and
cosine on the fly with a coordic. Perhaps not easy at RF speed, but very common
in audio DSP.
It's a tradeoff.. To do CORDIC you need four multiplies and 2 adds,
On 6/12/11 2:29 PM, Rich and Marcia Putz wrote:
HI all;
I believe the T-nuts have coined a new name for GPS antennas, Mushrooms! I always hated
the term pucks any how.
well.. when you put a puck on top of a 6 foot length of conduit, it
really does look like a mushroom (sort of like Enoki)
On 6/12/11 7:57 PM, Dave Brown wrote:
For a given OD the centre conductor will be SMALLER diameter for 75 ohm
cable wrpt 50 ohm cable.
Google for the whole minimum loss/highest power xfer capability etc
issue as regards coax cable diameter and impedance. All std textbook
stuff. Or used to be!
On 6/10/11 7:01 PM, Hal Murray wrote:
li...@rtty.us said:
There's an enormous amount of gear out there that gets timing off of GPS.
That's an interesting claim. Does anybody have any data on the usage of GPS
for timing?
I assume there is one in every cell tower and one in every 911 call
On 6/9/11 10:36 PM, Henry Hallam wrote:
On Thu, Jun 9, 2011 at 2:42 PM, Jim Luxjim...@earthlink.net wrote:
GPS orbits are tough from a radiation standpoint too.
In particular, the orbits are considerably worse for radiation than
GEO, and photovoltaic panels are quite susceptible to
On 6/10/11 6:55 AM, ehydra wrote:
Jim Lux schrieb:
The MEO height of GPS was a deliberate choice (again, that GPSWorld
series is a fascinating history of how it came about). Don't forget
that one of the original reasons for GPS was for doing midcourse
correction on ICBMs.
Where
On 6/9/11 12:22 PM, Chuck Forsberg WA7KGX N2469R wrote:
According to the John Deere article, the higher performance GPS
receivers, such as those used
for agricultural application and IFR navigation have wider front ends to
obtain more precise information
from GPS signals. The LightSquared
On 6/9/11 1:00 PM, Mark Spencer wrote:
Perhaps in the longer term (ie. next the several decades) moving away from the
current wide band spread spectrum scheme to a higher power narrow band scheme
might make more sense for GPS.A previous poster mentioned the use of nuclear
powered satellites
On 6/9/11 1:18 PM, William H. Fite wrote:
I well recall the furor over Cassini-Huygens in 1997 but approval was
ultimately granted and, of course, the launch was without incident. Since
then, New Horizons, Galileo, and Ulysses have been launched with far less
public outcry, despite the fact
On 6/5/11 3:28 AM, Will Matney wrote:
More on LightSquared from the Washington Post.
http://www.washingtonpost.com/local/lightsquared-wireless-internet-plan-conc
erns-officials-pushing-gps-for-aviation/2011/06/03/AGDX0qIH_story.html?nl_he
adlines
Best,
Will
WHat are the odds that Light
On 5/23/11 6:07 AM, Dr. David Kirkby wrote:
On 05/23/11 09:31 AM, Rob Kimberley wrote:
Try
http://www.symmetricom.com/media/files/downloads/product-datasheets/DS_SA.22
c.pdf
Rob Kimberley
Thank you. I don't have know what board area I have available, but I
think think its going to be
-Original Message-
From: WB6BNQ wb6...@cox.net
Sent: May 23, 2011 2:17 PM
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Subject: Re: [time-nuts] smallest rubidium
David,
You should have said so in the first place. Unless you are sure that the
reference
Sometimes, though, interspersed responses are appropriate. For instance, if
you've got a long analysis or list of things, or a list of questions, then
answering interspersed is more appropriate. (with a note at the top saying
answers interspersed below)
Many mail clients facilitate the
On 5/20/11 8:59 PM, w...@aol.com wrote:
So here are some URL's to explain the pattern for KNTH...
Fascinating stuff..
I note that the mailing address shown at radio-locator is about 5 miles
from my house in Southern California. Lots of other communications
related businesses at that same
On 5/20/11 11:51 PM, cook michael wrote:
Le 21/05/2011 08:30, Robert Darlington a écrit :
Guys, I gotta ask, what does this have to do with time keeping? Am I
missing something?
-Bob
I know what you mean. I was desperately fighting down the urge to reply
to Lamar's post to query the
On 5/20/11 3:28 PM, Lamar Owen wrote:
On May 20, 2011, at 5:54 PM, Jason Rabel wrote:
Television, radio, navigation... or something else? Looks like 11
towers...
29° 59' 34N, 95° 28' 24W
KNTH, DA2, 1070kHz AM, Houston. 10kW-D, 5kW-N; 11 towers daytime, 9
towers use nighttime, and man those
On 5/20/11 3:45 PM, Arthur Dent wrote:
The antenna arrays at these locations in Maine are much more
interesting, especially if you know what they are.
N45° 10.325 W069° 51.725
N45° 09.650 W069° 51.300
N45° 08.450 W069° 50.300
-Arthur
on your chosen frequency.
It doesn't square for me.
1,002737909350795 solar/sidereal time ratio
x 32768 crystal frequency
32857,72 required frequency for sidereal clock with 2^15 divider chain
I agree with your calculation.
Here I ask Jim Lux for help, as when I wrote
On 5/17/11 7:01 AM, Jean-Louis Oneto wrote:
I realized that there was lot of way to avoid this [pulldown] problem,
but as I said, it was a long time ago (around 1976...), I was young and
inexperimented, and I just tried once on an almost broken 5 FF (~$1)
wristwatch, then I decided that the
On 5/16/11 6:30 AM, brent evers wrote:
Can't you just use a programmable crystal? Digikey will do this for
you prior to ship. Search on crystal, then under the field type,
filter by Programmed by Digikey. Four types pop up as in stock.
Not sure if they would meet you footprint requirement,
On 5/16/11 2:58 PM, iov...@inwind.it wrote:
Neville,
at present I have not enough skill with micros to solve the problem.
I think I will try modifying a crystal. This would not be that difficult using
a lapping sheet or the like. And opening the can would be quite easy using hot
air.
or a fine
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