On 3/19/14 5:21 PM, Bill Hawkins wrote:
They only got one ping from INMARSAT at 64E above the Indian Ocean.
There was no other ping to triangulate the position.
One ping projects a circle on the Earth. The maximum flying range of the
plane determined the ends of the NE and SE arcs of that
On 3/16/14 8:13 AM, d0ct0r wrote:
Thanks ! Looks like I am on the right track.
I've attached couple of documents which could be useful. I'am going to
use two separated voltage regulators for VCC/AVDD and DVDD. And use 10
Ohm / 100Mhz ferrite board and few capacitors to separate VCC and AVDD.
On 3/16/14 9:34 AM, d0ct0r wrote:
I would assume that using two voltage regulators will spread the load.
For the AD9851 I'am planning to put external radiator glued on top of it.
It's not the power dissipation of the regulators that's the concern,
it's the dissipation of the 9854. A
you describe in IEEE pubs (I'm a
member of the power energy society) but don't remember much detail.
All the best,
Jim
wb4...@amat.org
On 3/13/2014 2:17 AM, Hal Murray wrote:
[Context is maybe(?) withdrawing the proposal to stop keeping time on the US
power line.]
wb4...@wb4gcs.org said:
Since
On 3/12/14 10:06 PM, Chris Albertson wrote:
On Wed, Mar 12, 2014 at 9:13 PM, Daniel Mendes dmend...@gmail.com wrote:
This is a FIR x IIR question...
moving average = FIR filter with all N coeficients equalling 1/N
exponential average = using a simple rule to make an IIR filter
Isn't his
accurate.
Hope this helps.
Jim
wb4...@amsat.org
On 3/12/2014 3:23 PM, Hal Murray wrote:
So we know there are deviations in line freq. But it seems strange in this
era of very accurate and inexpensive freq references. How much is related to
the generation?
Controlling the line frequency is a giant PLL
Just curious as to the range of sawtooth values that are typical for timing
receivers.
What's the maximum correction needed?
Thanks
jim ab3cv
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Hi Hal
Not arguing for or against sawtooth or hanging bridges, etc. My needs for
GPSDO performance are unquantified but likely quite modest. I just want to
get something working that's a bit better than my OCXO. I don't think I
need the sawtooth stuff to get started.
Thanks
jim ab3cv
Date
I think the hardware delay line approach is the only solution for a simple
D FF lead/lag phase comparator. It would be placed ahead of the FF.
Which GPS being built now provide sawtooth info?
73
jim ab3cv
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time-nuts mailing list -- time-nuts
in the uBlox u-Center software users guide.
Thanks
Jim ab3cv
Message: 3
Date: Fri, 7 Mar 2014 16:26:35 +0100
From: Azelio Boriani azelio.bori...@screen.it
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Another atomic clock question
On 3/7/14 12:31 PM, Chris Albertson wrote:
On Fri, Mar 7, 2014 at 10:28 AM, Lars Walenius
lars.walen...@hotmail.com wrote:
Chris, about using one Arduino for two GPSDO controllers:
Even if a microcontroller has lots of capacity I would recommend to use
separate controllers for each
On 3/7/14 3:33 PM, Chris Albertson wrote:
Let's see what is needed.
The ADC is 10-bits so it can read to one part in 1024. It's a 5 volt
full scale so we are only able to measure 5 millivolt increments
if you use the teensy3 it has a 16 bit ADC with realistically, about 13
bits
publish a schematic, code and test results once I have something
working.
Thanks
Jim ab3cv
Date: Fri, 7 Mar 2014 09:23:54 -0800
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Another atomic
On 3/3/14 2:18 AM, Hal Murray wrote:
Junk crystals are good thermometers. Ballpark is 1 ppm/degree-C
albertson.ch...@gmail.com said:
So does this mean I can epoxy a sandstone power resister to a junk crystal
and keep the frequency exactly perfect by varying the power in the resister?
On 3/2/14 8:32 AM, Glen Hoag wrote:
FSCM 38243 is the manufacturer information. FSCM is the Federal Supply
Code for Manufacturers, which appears to be a subset of CAGE (Commercial
and Government Entity) codes maintained by the Defense Logistics
Agency. FSCM 38243 appears to be PG Electronics
On 3/2/14 11:09 AM, Chris Albertson wrote:
Junk crystals are good thermometers. Ballpark is 1 ppm/degree-C
So does this mean I can epoxy a sandstone power resister to a junk
crystal and keep the frequency exactly perfect by varying the power in
the resister?
Yes.. but you have to hold
On 3/2/14 12:21 PM, Bob Camp wrote:
Hi
As long as your resistor keeps the temperature to within a micro degree it will
do pretty well.
Oh, you were looking for 1E-12.. I was thinking 1E-9 would be good enough.
The other issue is that the phase noise might be pretty bad with a cheap
On 3/2/14 1:00 PM, Magnus Danielson wrote:
On 02/03/14 21:45, Bob Camp wrote:
Hi
The gotcha is that there are second order temperature effects. If you
are going to run the crystal very far off turn, you need to keep it
more stable than you might think.
hysteresis, memory effect, restart of
As Jim mentions in another post, you can run on the fundamental and the third
(or 5th or 7th) and get a thermometer out of the delta between the two modes.
The gotcha is that a change in load impedance will shift the frequencies
unequally. That will give you an apparent temperature change.
I
On 2/27/14 6:40 AM, Didier Juges wrote:
The BBB has 2GB of flash on board (non removable) and has a micro SD socket.
Would not be too hard to keep a backup copy of the OS and apps on the SD card
so that it would be easy to boot from SD and reload the built-in flash if the
BBB fails to boot
On 2/26/14 12:44 AM, Hal Murray wrote:
rich...@karlquist.com said:
Solid dielectric cable and connectors of 3.5 mm size are mode limited to 18
GHz. That is why there is so much stuff rated at 18 GHz as opposed to 16 or
20 GHz.
Thanks. That's what I was looking for.
Wiki says that SMA
On 2/25/14 1:40 PM, Tom Van Baak wrote:
So what's all this about a Thallium Beam Tube???
For info about the pro/con of Thallium beam frequency standards, see:
http://tf.boulder.nist.gov/general/pdf/9.pdf
http://tf.boulder.nist.gov/general/pdf/211.pdf
On 2/23/14 8:11 PM, Daniel Mendes wrote:
This is a different breed of time nuttery than usual in this list but i
think that at least some of you will enjoy it:
http://www.behance.net/gallery/FLUX-1440/2420150
Found it at hack a day
An enormous amount of work went into painting the
On 2/24/14 6:08 AM, Chuck Harris wrote:
Really impressive would be to have it create the
patterns that make the numeric display out of only
several feet of slowly moving rope connected as a
loop... but that would require some thinking, rather
than just a brute force approach.
It's art, after
On 2/24/14 8:17 AM, Poul-Henning Kamp wrote:
In message caa-f0u_jbz5dyb+hacmwfpkz6vhfo7arz+jpsmhrt9uss2n...@mail.gmail.com
, Pete Lancashire writes:
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf
pages 8 9
As far as I know, those satellites never made it
I ran across these units
http://www.conwin.com/time-frequency_references-gps_disciplined-gps_references.html
and I found some references from a few years ago in the time-nuts
archives, but I can't find any data on phase noise, etc. for the
disciplined output.
The data sheet/user manual/etc
On 2/22/14 5:17 AM, Jimmy Burrell wrote:
I need some help with a 'noob' question regarding some practical
examples in some of the NIST literature. When attempting to compare
two clocks, I'm a bit confused on the subject of exactly how to use
my counter to compare a delayed clock relative to
Google 'fractal antenna'. Fractal Antennas are a relatively recent (late
1980's to mid-1990's) discovery/invention. I have read that they are
approximately 20% more efficient than normal antennas.
Jim, KG4FXV
From: d0ct0r t...@patoka.org
To: Discussion
On 2/22/14 10:01 AM, Said Jackson wrote:
Jim,
Check the archives, I am pretty sure I reported on one of them, I think it was
on the FTS-250.. Or FTS-125.
Found it.. thanks.. the key was to put your name in the search
My recollection: Not that bad for the price, but phase noise and spurs
On 2/22/14 6:06 PM, saidj...@aol.com wrote:
Jim,
not sure if I had sent these before, or if you found them in the archives,
here are my ADEV, phase noise, and frequency stability measurements results
of the FTS-250.
All I did was remove the GPS antenna for about 10 seconds during the test
On 2/21/14 5:37 PM, Scott McGrath wrote:
It may be a downconverter rather than a filter some GPS time systems notably
ones by true time used an active down converter to transform signal to baseband
for long cable runs. Voltage to converter was rather high as I recall
Sent from my iPhone
On 2/20/14 4:40 PM, Brian Lloyd wrote:
On Thursday, February 20, 2014, J. Forster j...@quikus.com wrote:
The large amplitude swings happen on a very short time scale too.
Certainly 1 second at times.
8-bits is 48 dB. 16-bit parts at 60kHz should be cheap now. Why bother with
AGC? Just make
On 2/19/14 10:24 AM, Brooke Clarke wrote:
Hi:
This means that the concrete piers where many Cesium clocks and GPS
reference stations are located are bobbing up and down as if they were
on a ocean, although only tens of inches.
My GPS friends comment when you start getting to sub-meter
On 2/16/14 11:55 AM, Jimmy D. Burrell wrote:
I've looked at several different manufacturer GPS datasheets now
regarding the 1 PPS output in an attempt to compare apples to apples.
Some of them rate their 1 PPS output as something on the order of
PPS signals have an accuracy ranging 10ns which
On 2/13/14 10:09 AM, Chris Albertson wrote:
-- Forwarded message --
From: Chris Albertson albertson.ch...@gmail.com
Date: Thu, Feb 13, 2014 at 8:58 AM
Subject: Re: Atmega?
I posted this off list, but I'm reposting on the list with mnor edits. I
think there might be people
On 2/13/14 4:27 PM, Bob Camp wrote:
Hi
The number of bits and the performance of the ADC’s on the Arduino’s is pretty
underwhelming compared to the stuff on other similarly priced MCU’s. If you are
doing a design where the ADC matters, a PIC or just about anything from TI or
Freescale will
screwdriver handle. And if nothing more shows up, I'll try
opening it up and looking for 'dry' or otherwise crook solder joints, etc.
I did find the idea of rubidium movement inside the bulb an interesting one,
though. It's a possibility, isn't it?
Cheers,
Jim Rowe
-Original Message-
From
you to use an external source of 1Hz pulses like those from a
GPS receiver or a GPSDO, or a Rb Freq Reference. The dividers operate on
these 1Hz/1pps pulses as well, to provide gating times of 1s, 10s, 100s or
1000s. It seems to work pretty well.
Cheers,
Jim Rowe
-Original Message
Hi Mark,
I doubt if the counter is off frequency, since I'm using the 1pps pulses
from my GPSDO as its timebase. So although there's a bit of short-term
jitter, the longer-term count should be very close.
I will try the experiment you suggest, though, and see what difference
inversion makes
Hi Magnus,
Thanks for your further comments. As you probably saw in my reply to Mark
Sims, I am proposing
to check the swing limits 'before and after' inverting the unit, to check
out the theory before I open it up and try tweaking C217.
Cheers,
Jim
-Original Message-
From
in the right-side-up position. I don't want to
tempt fate, while its OK. What's that old adage? If it ain't broke, don't
try to fix it.
Cheers all,
Jim Rowe
-Original Message-
From: Jamieson (Jim) Rowe
Sent: Monday, February 10, 2014 8:05 AM
To: Discussion of precise time
between 9.999770
and 10.36MHz -- i.e., about 230Hz low and about 36Hz high. But it was
spending more of the time below 10MHz than above -- does this suggest to you
that I should tweak C217 until it swings by about the same amount either
way?
Cheers,
Jim
-Original Message-
From
'right way up' -- right?
Cheers,
Jim Rowe
-Original Message-
From: beale
Sent: Saturday, February 08, 2014 6:40 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts]How I got my FE-5680A to lock in Sydney, Australia
The entry in the FE5680 FAQ on this subject may be helpful, if you
Hi Ignacio,
Thanks for your comments also. I will open up the unit and see if I can find
any dry or poorly soldered joints, etc.
Best regards, Jim Rowe
-Original Message-
From: EB4APL
Sent: Saturday, February 08, 2014 12:21 AM
To: Discussion of precise time and frequency
Thanks for that suggestion too, Mr Kehren. I'll check for dry joints, etc in
that region also...
Cheers,
Jim Rowe
-Original Message-
From: ewkehren
Sent: Saturday, February 08, 2014 12:39 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] How I got my FE-5680A to lock in Sydney
that another approach might be to try varying the tuning
via the RS-232C serial port? Does this work via the C-tuning coil anyway, or by
tweaking the DDS?
I hope a much more experienced time nut can provide a few answers, please.
Jim Rowe
___
time
all (I do have quite
a bit of electrical wiring and electronic gear in my work room).
All the best,
Jim Rowe
-Original Message-
From: Ed Palmer
Sent: Friday, February 07, 2014 1:54 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] How I got my FE
-metal
shield case...
Best regards,
Jim Rowe
-Original Message-
From: Tom Harris
Sent: Friday, February 07, 2014 2:31 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] How I got my FE-5680A to lock in Sydney, Australia
I got into trouble once when we
Hi Magnus,
Thanks for those suggestions also. So if I understand you right, I'd be
better off trying to tweak the oscillator tuning -- using the trimcap? Or
did you mean via the RS-232C 'offset adjustment' command?
Regards,
Jim Rowe
-Original Message-
From: Magnus Danielson
no frequency change. I think this indicates that an
internal voltage regulator is used in the crystal circuitry and that it needs
at least 20 volts to work.
Jim Teixeira
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On 1/24/14 11:57 AM, Volker Esper wrote:
Nice! I didn't know that. But what a number, 300... Why such a
digital-hostile factor? Why not 256 or 512?
Volker
Am 24.01.2014 20:51, schrieb tmil...@skylinenet.net:
9.8304 MHz divided by 300 is 32,768 Hz.
Feed that to an electronic clock and you
On 1/19/14 10:31 PM, Chris Albertson wrote:
On Sun, Jan 19, 2014 at 6:41 PM, Lizeth Norman normanliz...@gmail.comwrote:
Is it possible to write (assuming the poor little creature would do it) a
piece of code, that given your lat/long, the time and a two line element
set for an orbiting
to compensate..
Or, provide a finer resolution for the timer libraries.
I suspect someone has already done this, so I'll do some googling.
#include TimerOne.h
#include Time.h
// Solar clock to drive mechanical mechanism
// Jim Lux, 19 Jan 2014
// assumes a mechanical clock is connected
much the same for it as well. The math gets a bit more
complicated, but the drop / add result nets out to the same thing.
Yes, that's something I need to add: a overall rate adjust to
calibrate the crystal.
Bob
On Jan 20, 2014, at 11:19 AM, Jim Lux jim...@earthlink.net wrote:
here's
On 1/20/14 9:20 AM, Jim Lux wrote:
Interestingly, it occurred to me that one could just add a sufficiently
large deviation random number to the period each time to dither it.
The rate changes once per hour (per tvb's EOT routine), so there's
3600 ticks at a given rate. If I were to vary
On 1/20/14 9:48 AM, Bob Camp wrote:
Hi
There are *lots* of ways to do any sort of code. I can’t think of any practical
problem that has a single unique “best” way to do it. All I’m trying to say is
that there is a way to get the job done (to much better accuracy than you need)
with what you
On 1/19/14 1:51 PM, Tom Van Baak wrote:
Use 24h clocks for
best results. They can be had from www.clockkit.com, an excellent
source of DIY quartz clock parts.
I couldn't find 24hr movements on the clockkit.com site.. where are they?
___
On 1/20/14 10:06 AM, Jim Lux wrote:
On 1/19/14 1:51 PM, Tom Van Baak wrote:
Use 24h clocks for
best results. They can be had from www.clockkit.com, an excellent
source of DIY quartz clock parts.
I couldn't find 24hr movements on the clockkit.com site.. where are they?
http
So here's my next idea..
Set up a 24 hour movement (no minute hand) so that you have the sun
moving around the dial: at the top at solar noon, with the rate being
reasonably constant around the dial(e.g. using the solar clock
algorithms developed)
Then, have two other pointers or sectored
On 1/20/14 11:00 AM, Bob Camp wrote:
Hi
I realize this is *exactly* what the OP didn’t want to do, but ….
A PI or any of the little dedicated ARM + GPU gizmos driving a cheap junk HDMI
monitor or TV would make for a very nice display of all that data… The total
cost could still be under
On 1/20/14 3:32 PM, Rex wrote:
That listing is a bit vague about if it has a second hand. For the kind
of pulse drive that has been discussed here, it seems you would want a
definite second capability and step vs. smooth second hand drive.
I know nothing except a little web searching, but this
On 1/20/14 5:57 PM, Robert LaJeunesse wrote:
Since most of those cheapo movements are a simple single-coil motor, energized with alternating
polarity short pulses, it would seem that there is no need for a 24 hour movement. You
can just have your micro pulse it twice the normal period, but
On 1/20/14 6:15 PM, Chris Albertson wrote:
On Mon, Jan 20, 2014 at 6:54 AM, Jim Lux jim...@earthlink.net wrote:
On 1/19/14 10:31 PM, Chris Albertson wrote:
On Sun, Jan 19, 2014 at 6:41 PM, Lizeth Norman normanliz...@gmail.com
wrote:
This is why I am a fan of the Teensy3... It's
On 1/19/14 2:00 AM, P Nielsen wrote:
To Jim Lux. After you get it working, would you consider putting the details
online, or selling as a kit?
Half coded.
I'll publish all the details..
It's pretty easy.. a Arduino, a clock, a wall wart to power it. I
haven't tried it yet (no clock to test
On 1/19/14 1:49 AM, Chris Albertson wrote:
On Sat, Jan 18, 2014 at 11:14 PM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
Are you perhaps thinking of sidereal time, Chris?
Either way, the difference is within the limits of the basic tin wind-up
alarm clock. A quality wrist watch
On 1/19/14 9:17 AM, Chuck Harris wrote:
The usual quartz clock that runs off of a AA cell is a little
trickier to drive than you might think. You need to feed
its stepper motor coil with an alternating +1.5V and -1.5V pulse.
The pulse follows the rising or trailing edge of a 1/2 Hz square
wave.
On 1/19/14 9:40 AM, David J Taylor wrote:
From: Jim Lux
Right now, the EOT is changing almost 30 seconds/day, which implies that
the clock could be some seconds off during part of the day (although
true at noon).
[]
30 seconds/day?
http://www.sundials.co.uk/pix/c/eot3.gif
from:
http
); // turn off pulse
pinMode(D1,INPUT);
}
That way you're not drawing power most of the time..
-Chuck Harris
Jim Lux wrote:
On 1/19/14 9:17 AM, Chuck Harris wrote:
The usual quartz clock that runs off of a AA cell is a little
trickier to drive than you might think. You
On 1/19/14 10:47 AM, Don Latham wrote:
Jim: I used a simple f/f, q and ~q and 180 ohm resistors. Could easily
be done with two ard outputs. needs 1/2 sec cycle. i just disconnected
the coils from the epoxied blob with the clock electronics. You can also
drive it backwards if it amuses. . .
Don
On 1/19/14 11:21 AM, Tom Van Baak wrote:
Yeah.. that *is* the challenge.
Use two outputs and make a sort of H bridge
Jim,
No problem.
1) equation of time:
See www.leapsecond.com/tools/eot1.c, source code that generates the equation of time and
its derivative. Sample output attached. You
So, Tom's EOT routine takes less than a millisecond to execute (in
double precision) on the Arduino..
So what I can probably do is call it every minute or hour to update the
rate for the next minute/hour.
Now I just have to figure out how to conveniently set the current
date/time (for now,
On 1/19/14 11:24 AM, Bob Camp wrote:
Hi
I’d put the table(s) in flash. You aren’t going to change it often enough to
matter in terms of re-flash cycles. They would all be pre-calculated for that
clock at that location, starting from today. In my approach this would be a
very application
On 1/19/14 12:20 PM, David J Taylor wrote:
From: Jim Lux
http://www.wsanford.com/~wsanford/exo/sundials/equation_of_time.html
5 Jan 5.2 minutes
6 Jan 5.7 minutes
30 seconds in a day..
The total variation over the year is +/- 15 minutes, but the derivative
is a lot bigger at some times
It turns out there's a handy Arduino library for time. And it will
ingest GPS or NTP, etc., as well as run off the internal clock.
One strategy, then, is:
Set the clock in the Arduino
then, periodically (once a minute or hour)
look up the date and time
calculate rate
On 1/19/14 1:51 PM, Tom Van Baak wrote:
So, periodically, one would need to reset both the analog clock AND the
Arduino clock to bring them back to proper alignment.
I suppose that periodically, one could compare number of ticks sent
with UTC + EOT offset and try to compensate (by dropping
On 1/19/14 3:58 PM, Chris Albertson wrote:
It is. Both double and float are 32-bits. Arduino uses the GCC AVR
compiler.
If you care a lot about precision you use integer math and do all your
calculations in integer units of milli or microseconds. If you try to keep
time in floats you are
.
---
#include Time.h
// Solar clock to drive mechanical mechanism
// Jim Lux, 19 Jan 2014
#include math.h
#define TIME_MSG_LEN 11 // time sync to PC is HEADER followed by Unix
time_t as ten ASCII digits
#define TIME_HEADER 'T' // Header tag for serial time sync message
#define TIME_REQUEST
On 1/19/14 6:41 PM, Lizeth Norman wrote:
Hi all,
Funny how this topic of the arduino time library comes around. Have been
following your conversations regarding the precise nature of arduino time
(gps time aware)
Is it possible to write (assuming the poor little creature would do it) a
piece of
On 1/19/14 8:00 PM, P Nielsen wrote:
It's not clear if the OP wants true local time or the time at the center of
his time zone.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
My original idea was to have 12 noon equate to the sun's
On 1/18/14 2:25 PM, P Nielsen wrote:
I am looking for a physical clock (not software) that will indicate local
solar time. IOW when the sun is at its highest point, the clock would
reliably read 12:00 throughout the year.
So it needs to take into account the equation of time?
there's
On 1/18/14 2:25 PM, P Nielsen wrote:
I am looking for a physical clock (not software) that will indicate local
solar time. IOW when the sun is at its highest point, the clock would
reliably read 12:00 throughout the year.
Is there a commercial product or kit available for this?
On 1/18/14 4:22 PM, Tom Van Baak (lab) wrote:
Add GPS if you want the clock to self-adjust when moved east or west (noon
moves a couple of milliseconds per meter). This feature would be especially
cool if the clock were used in a vehicle.
Ooohh... an automatic self adjusting sundial for
On 1/18/14 2:25 PM, P Nielsen wrote:
I am looking for a physical clock (not software) that will indicate local
solar time. IOW when the sun is at its highest point, the clock would
reliably read 12:00 throughout the year.
Once you buy into a microprocessor, it's pretty easy to make all
Just in case you want to build a clock with an Arduino..
http://jorisvr.nl/arduino_frequency.html
ADEV measurements, etc.
take home message.. absolute accuracy is a few kHz out of 16 MHz...
probably a 100 ppm crystal.
On some Arduinos (or Teensy3's which is what I use) there's a provision
On 1/18/14 5:11 PM, Bill Dailey wrote:
http://www.precisionsundials.com
The sawyer looks like it fits the bill.
$8,000
Actually, only $2,100.. that fancy helical thing Renaissance was the 8
kilobuck one..
The Sawyer thing has a lot of nice design features. Very clever how
they do the
On 1/18/14 5:23 PM, Mark Sims wrote:
Lady Heather can display time in LMST/LAST/GMST/GAST
I made a version that has an option to just show the date/time in full screen
mode for Jim Lux/JPL but never heard back from him.
I have passed it on to the person
I'm working on it now. Got the arduino UNO, need to go get a cheap cook
tomorrow
On Jan 18, 2014, at 18:01, P Nielsen pniel...@tpg.com.au wrote:
Thank you for the suggestions so far.
When I said no software, I meant not something like this:
On 1/17/14 8:43 AM, Michael Perrett wrote:
Magnus, I believe that he is referencing the the new L2 C/A code, which is
not protected. Reference
http://www.gps.gov/systems/gps/modernization/civilsignals/
Is the L2c officially on yet? and how many S/V are radiating it? I know
there was some
On 1/17/14 11:35 AM, Magnus Danielson wrote:
On 2014-01-16 20:29, Hal Murray wrote:
anders.e.e.wal...@gmail.com said:
The real benefit of dual-frequency is you can do post-processing with
PPP.
Javad has some modules but they start at 3 kUSD - if anyone knows of
hobby
level priced L1/L2
http://arstechnica.com/security/2014/01/dos-attacks-that-took-down-big-game-sites-abused-webs-time-synch-protocol/
Interesting.. throw requests at an NTP server that look as if they come
from the target, prompting large responses to the victim, presumably to
overload it.
The article talks
On 1/10/14 1:06 PM, Paul wrote:
On Fri, Jan 10, 2014 at 2:52 PM, Chris Albertson
albertson.ch...@gmail.comwrote:
It's not a big deal. Even if one pool NTP server is down
On Fri, Jan 10, 2014 at 4:32 AM, Jim Lux jim...@earthlink.net wrote:
The article talks about how the victim site can
On 1/8/14 9:06 PM, David I. Emery wrote:
On Wed, Jan 08, 2014 at 08:09:04PM -0500, Charles Steinmetz wrote:
Nathaniel wrote:
Following from that, suppose a jammer parks nearby and doesn't leave
in a timely fashion. How long does it take for the FCC to swoop in
(do they swoop? in my mind they
On 1/6/14 9:44 PM, Magnus Danielson wrote:
Jim,
On 07/01/14 05:43, Jim Lux wrote:
On 1/6/14 8:36 PM, Magnus Danielson wrote:
Bob,
It works the other way around. The standard Bell handset (103A I believe
the designation was) has the 300-3400 Hz response, and with not so fancy
analogue
On 1/6/14 6:05 AM, Magnus Danielson wrote:
MEMS might be good for certain tasks, but for closer in noise I've only
seen some progress recently, but not measured it myself. Close-in noise
seems to have been pretty bad for all MEMS so far.
I think that's probably related to the physically
On 1/6/14 8:36 PM, Magnus Danielson wrote:
Bob,
It works the other way around. The standard Bell handset (103A I believe
the designation was) has the 300-3400 Hz response, and with not so fancy
analogue filtering, you can handle 4 kHz and thus 8 kHz sampling rate.
The ITU-T G.711 A-law (where
Sony SW receiver from eBay would work.
Jim
On 1/3/14 1:31 PM, Brian Lloyd wrote:
On Fri, Jan 3, 2014 at 12:09 PM, Bob Albert bob91...@yahoo.com wrote:
Jayson,
I chuckle because WWV is my favorite radio station also.
Why not tune it in on a good day and record the audio? Then you can
On 1/1/14 10:28 PM, David J Taylor wrote:
From: Hal Murray
Are there any events similar to New Years where some specific countdown
time
is shown on TV?
Rocket launches, although typically not on live TV any more. More likely
streamed (at least that's how I watch them). In the post launch
On 1/2/14 11:56 AM, Chris Albertson wrote:
When they broadcast live TV like from a sports vent I wonder if the time
code generated by the camera is preserved? But then even if it were the
time might have been set manually to match the display on the camera
operator's cell phone.
Depends on
On 1/2/14 11:33 AM, Bill Hawkins wrote:
IIRC, the reason why NTSC has an almost 30 fps rate is that early
vacuum tube TV sets could develop heater-cathode leakage that
would put a black hum bar in the picture. Almost 30 allows the
bar to move through the picture in a 60 Hz power distribution
On 1/2/14 2:33 PM, Chuck Forsberg WA7KGX wrote:
Why didn't they make the color burst an exact multiple of 60 Hz?
Round numbers and such
http://en.wikipedia.org/wiki/Colorburst
has a nice description..
The whole thing of backwards compatibility and squeezing the maximum
amount of
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