On 4/16/13 9:17 PM, Lachlan Gunn wrote:
A few reasons:
- I am interested to see what can be done with the statistics of an
ensemble of oscillators---in particular, whether the additional measurements
can be used to get a timescale that is more stable than just GPS and OCXO or Rb.
-
On 4/17/13 4:26 AM, Bob Camp wrote:
Hi
The description from their tech guys is "Very high gain front end. It's a saturating
amp rather than a comparator."
I thought the whole point of fast ECL logic was that it never saturated.
Of course these days, one might have very fast saturating logi
On 4/16/13 8:28 PM, Mark C. Stephens wrote:
Actually, before I plugged the GPS antenna into the second unit, I checked out
where it last called home:
LAT N 36:01:05.225
LON E 128:41:48.761
HGT+1214.14 m (MSL)
Mt Palgong, according to Google Earth
Lots of transmitter towers up there,
On 4/16/13 5:19 PM, Sarah White wrote:
I just have to ask though... cake pans? really? I can't imagine it would
even be possible to modify a cake pan with enough accuracy to get a
usable antenna.
Sure.. cake pans, like other stamped goods, are actually pretty high
precision, because they're
On 4/16/13 11:04 AM, Attila Kinali wrote:
On Mon, 15 Apr 2013 23:00:49 -0700
Jim Lux wrote:
the effect of a strong multipath (which is what the choke ring
suppresses) would be a LOT bigger than that..
Uhmm.. to my understanding, this is not quite true.
The choke ring does not surpress
On 4/15/13 10:40 PM, bg wrote:
Chris,
Chokering is not needed. Measured quality antennas are listed at
http://www.ngs.noaa.gov/ANTCAL/
Or at
http://www.geopp.de/index.php?sprachauswahl=en&bereich=0&kategorie=34&artikel=62
/Björn
A lot of the antennas on that list are ch
On 4/15/13 10:22 PM, Jim Lux wrote:
On 4/15/13 9:27 PM, Tom Van Baak wrote:
NIST SIM GPS common view pinwheel
described in one of the NIST reports as an aperture coupled slot fed
array that is better than a patch, but not as large and heavy as a choke
ring.
W. Kunysz, 2000, “High
On 4/15/13 9:27 PM, Tom Van Baak wrote:
NIST SIM GPS common view pinwheel
described in one of the NIST reports as an aperture coupled slot fed
array that is better than a patch, but not as large and heavy as a choke
ring.
W. Kunysz, 2000, “High Performance GPS Pinwheel Antenna,” in
Proceedi
On 4/15/13 8:36 PM, Chris Albertson wrote:
On Mon, Apr 15, 2013 at 8:23 PM, Tom Van Baak wrote:
I'd be curious what level of improvement is possible. It will depend on the
receiver and the antenna. I believe the NIST project uses fancy antennas
but normal M12 receivers. So there's hope for the
On 4/15/13 1:48 PM, Dr. David Kirkby wrote:
On 04/15/13 04:39 AM, Jim Lux wrote:
Inexpensive USB spectrum analyzer.. http://www.signalhound.com/
It's not that inexpensive. I assembled a 22 GHz spectrum analyzer based
on the HP 7 modular measurement system for about the same money.
Inexpensive USB spectrum analyzer.. http://www.signalhound.com/
I think it has the ability to capture raw samples, too. (the BB60
definitely does.) They have a 10MHz ref input.
The spectrum analyzer has a phase noise feature
Phase Noise Plot
: Displays the phase noise amplitude, in dBc/Hz, vs
On 4/8/13 2:12 PM, Tom Van Baak wrote:
Alan,
Google for words like GPS re-radiator or GPS repeater. There are also units on
eBay. If not to buy, at least to study examples.
The one I have is made by www.gpssource.com but it seems you could build one
yourself. It's easy to test by looking at y
On 4/8/13 9:59 AM, Alan Melia wrote:
Hi all an interesting problem you may have encountered, I want to use a
GPS frequency standard inside a building with no opening windows
(opening windows are known as air conditioning in the UK :-)) )
This is part of a two day amateur microwave conference so
On 4/6/13 12:44 PM, Ivan.Cousins wrote:
Here is a related Arduino project.
http://www.pjrc.com/teensy/td_libs_TinyGPS.html
This is where I get my Arduino boards.
I like the 32 bit Arduino processor for some applications.
http://www.pjrc.com/store/teensy3.html
I'm a big fan of their teensy3..
On 4/6/13 6:55 AM, Bob Camp wrote:
Hi
On Apr 6, 2013, at 9:39 AM, Jim Lux wrote:
On 4/6/13 6:08 AM, Lester Veenstra wrote:
Any TimeNutter worth his/her salt can do that..right!
$100 Presto 23 qt canning style pressure cooker, electric heating elements,
thermocouple probes, some
On 4/6/13 6:08 AM, Lester Veenstra wrote:
Any TimeNutter worth his/her salt can do that..right!
$100 Presto 23 qt canning style pressure cooker, electric heating
elements, thermocouple probes, some fiberglass insulation to reduce
conductive losses.
Do it in your backyard and have a straw b
On 4/4/13 7:52 AM, Herbert Poetzl wrote:
On Thu, Apr 04, 2013 at 02:32:09PM +, Mark C. Stephens wrote:
I wanted to have a look at what the Z3805A puts out on Port 2.
I can see the LEDS flickering on the BOB so its saying something.
I connected up a terminal program set to 96008N1 and it s
On 4/4/13 12:51 AM, gary wrote:
Isn't this what WAAS does?
http://igs.bkg.bund.de/ntrip/about
Yes..
There's lots of ways to get real time (or near real time) correction
data. WAAS is but one. TASS (experimental) is another. There's various
and sundry local High Accuracy Reference Netwo
On 4/3/13 11:32 PM, gary wrote:
Can anyone translate this to English. OK, it is English, but you know
what I mean. It is supposed to be some new time service.
http://rts.igs.org/access/
Not exactly time service.. this is one of the entry points to do high
performance GPS geodesy. Of course
On 4/1/13 3:06 PM, Bill Hawkins wrote:
Looking for a long, thin horizontal clock display for use above or below
a flat screen TV.
Tried searching for "bar clock" and got a lot of useless hits.
If you're bulding it.. Arduino is your friend.. there's tons of LED
displays of all shapes and siz
On 3/30/13 2:58 PM, Lizeth Norman wrote:
What a bunch of hooey. Another so called expert wasted hours of my time
because he can't be bothered to either note that code is buggy or just
can't be bothered..
If you don't want to release it, then don't. If you do and it's a POS,
Expect emails.
Let
On 3/30/13 5:31 AM, Bob Camp wrote:
Hi
If you go back into the papers from the early 1980's there is one where they
used a high gain antenna and no knowledge of the coding scheme to pull timing
off of GPS. I believe it was at White Sands, but that could be wrong.
One can just run it into a
On 3/29/13 9:01 AM, Bob Camp wrote:
Hi
Too much tuning range is easy enough to fix. Use a pot to set it on frequency and then
hook it to the rest of the "stuff" with a fixed resistor. The gotcha would be
if the poor thing drifts so much that it *needs* the wide range to stay in lock.
My guess
On 3/29/13 2:36 PM, Chris Albertson wrote:
COSMIC and (coming soon) COSMIC-2 also do GPS occultation.
Yes, but COSMIC is not a constellation of 12 satellites and it is not as
cheap either. These guys want to put up 12 satellites at a total cost of
only $160M
COSMIC-2 is a constellation of 6
On 3/29/13 9:09 AM, David J Taylor wrote:
FYI: Yet another use for GPS timing signals is proposed:
http://bits.blogs.nytimes.com/2013/03/28/a-marshall-mcluhan-approach-to-weather-forecasting/
==
It's already been done! GPS occultation sensors have been fitted
On 3/27/13 3:20 PM, Bob Camp wrote:
Eight ohms at 28 volts would be just a bit under 4 amps. It's also
right at 100 watts. I'd be very surprised it you need anywhere near
that much current. You probably want a pure sine wave to keep
everything happy. A lot of the simple inverters are "sort of" s
On 3/25/13 8:27 AM, David Kirkby wrote:
On 25 March 2013 14:36, Jim Lux wrote:
On 3/25/13 7:17 AM, David Kirkby wrote:
The TCXO oscillator is off the board and a separate item, but costs
£40 and then one ideally wants to lock that to a more precise source.
The oscillator will lock to an
On 3/25/13 7:17 AM, David Kirkby wrote:
I'm possibly looking for a 40 MHz source and I know some of the
rubidiums are programmable. But can any of the affordable ones be
programmed to work at 40.0 MHz?
I was looking for a source to drive this 144 MHz -> 10 GHz transceiver.
http://www.chris-bart
On 3/24/13 8:22 PM, Chris Albertson wrote:
On Sun, Mar 24, 2013 at 7:34 PM, EB4APL wrote:
I wanted to build a GPSDO using the Brooks Shera design since I read the QST
article. I asked him in Jan 2009 about his source code, because I wanted to
change the PIC to a more modern one and add some fu
On 3/23/13 7:27 AM, J. Forster wrote:
I think the date for the DST time change were altered some years ago,
hence the Win SW messes up. I keep the 'puter clock on local time for
convenience, and switch because eBay does. I am only concerned with
roughly accurate local time.
For the last few y
On 3/13/13 7:06 AM, Bob Camp wrote:
Hi
A GPS that uses position hold gets it's coordinates from one of two possible
sources:
1) You measure the actual antenna location with a precision survey grade GPS
and enter them.
--or--
2) The GPS does a survey for some amount of time. It averages it's o
On 3/11/13 6:49 AM, James Peroulas wrote:
Date: Sun, 10 Mar 2013 17:37:13 -0700
From: gary
To: time-nuts@febo.com
Subject: Re: [time-nuts] frequency reference for portable operation
Message-ID: <513d2739.8030...@lazygranch.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have
Asking here on behalf of a friend..
With respect to portable amateur microwave operation.. you want good
close in phase noise (so you can use narrow band filters) AND good
frequency accuracy (so you can find the signal)>
the typical operation is "drive somewhere, operate a bit, drive
somewhe
On 3/4/13 6:52 PM, Bill Hawkins wrote:
Wouldn't it be easier to glue a fruit fly to the head of a pin and
attach electrodes to its visual ganglia to detect the change in
intensity of a segment of the display?
Excuse me, just back from surgery and the anesthetic may have
lingering effects. Discus
On 3/3/13 1:41 PM, DaveH wrote:
Fahnestock clips?
Alligator clips, of course.
But, I looked through the connector catalogs and I didn't see any double
shielded Fahnestock OR Alligator clips..
More seriously, you hook both shields to the shield of the connector.
Unless you want to get T
On 3/3/13 10:47 AM, Chris Albertson wrote:
It's not an e-field antenna. The goal is the sense the current in the LCD.
My bet is no much of anything leaks out of that RSA device or a wrist
watch either. You have to figure that tiny battery lasts for over a
year and even if ALL the energy in th
On 3/3/13 10:09 AM, Poul-Henning Kamp wrote:
Content-Type: text/plain; charset=ISO-8859-1
In message <51336234.3090...@earthlink.net>, Jim Lux writes:
Most LCD and LED clocks have a shielding metal-coating on the front
glass, exactly to eliminate all EMI/EMC issues.
Yes, but p
On 3/3/13 8:52 AM, cfo wrote:
On Sat, 02 Mar 2013 11:33:02 -0800, Jim Lux wrote:
I am interested in the timing behavior of my RSA fob, which changes
every 60 seconds. Since I'm not about to open it up and probe inside, I
was wondering if someone had a clever way, say using a USB web ca
On 3/3/13 9:12 AM, EB4APL wrote:
When LCD wristwatches became common in the seventies we, in the
frequency and timing group of a space tracking facility, investigated
the possibility of adjusting our new watches against our standard.
We found that a a small copper plate, about 1 X 2 cm, resting a
On 3/3/13 8:00 AM, Kevin Rosenberg wrote:
On Mar 3, 2013, at 7:59 AM, John Ackermann wrote:
Lesson learned -- use only double-shielded cable in the oscillator rack (and in
any RF measurement path) from now on.
I've learned that lesson as well. John Miles said that RG-58 is occasionally
refe
On 3/3/13 1:00 AM, Poul-Henning Kamp wrote:
Content-Type: text/plain; charset=ISO-8859-1
In message <657D7F7CC03849419A2A90752E6A60A6@pc52>, "Tom Van Baak" writes:
When playing with watches a while ago I tried to pick up any 32
kHz signal but failed. Those with 1 Hz stepper motors were
On 3/2/13 4:12 PM, Magnus Danielson wrote:
On 03/03/2013 01:00 AM, Peter Gottlieb wrote:
Perhaps you can detect EMI from the device especially if you put it it a
shielded metal box with pickup antenna. You might be able to get the
clock right from that.
Well, considering that actively "driving
On 3/2/13 2:52 PM, Tom Van Baak wrote:
Hi Jim,
I had a similar challenge a while ago. I ended up capturing a
4-digit, 7-segment display with a USB/LAN webcam, converting the JPG
to BMP, analyzing pixel gradients, matching the image with heuristic
masks, and appending an ascii log file with the
On 3/2/13 1:29 PM, li...@lazygranch.com wrote:
If you think about it, there would have to be some time correction if only
because these fobs can't be all that accurate in maintaining time. That is,
they would be no better than a watch.
I'm not so keen on wearing out the internal battery since
On 3/2/13 1:10 PM, Peter Gottlieb wrote:
I had one for work a while back and asked the IT security guys about it
and was told that the change was on a fixed schedule but of course each
fob was a little different due to temperature, over time, etc and that
the system automatically "learned" the fo
On 3/2/13 12:30 PM, li...@lazygranch.com wrote:
My fob only outputs a code on demand, that is after I push the button.
Any of the motion detection programs that use webcams would detect the change
in display, but with a multiplexed display, I'm not sure how well.
Interesting point.. mine onl
I am interested in the timing behavior of my RSA fob, which changes
every 60 seconds. Since I'm not about to open it up and probe inside, I
was wondering if someone had a clever way, say using a USB web cam, to
log the changes over a 48 hour period. You'd point the web cam at the
fob, and it
On 2/19/13 10:58 PM, Hendrik Dietrich wrote:
Good morning Paul,
First: I almost spilled my coffe as you bear a similar last name as a
guy at a national research lab who does exactly such things :)
Even when it makes your ECG preamplifier free for other things, I advise
you to use another sensor
On 2/19/13 4:58 PM, Paul Cianciolo wrote:
Hello Folks,
I am working on a project intended to convert an analog ECG signal to
a voltage proportional the heart rate, The actual electrodes
instrumentation amp is pretty much working fine so no worries
there.
The problem is, and here is where the r
On 2/15/13 6:21 AM, Bob Camp wrote:
The timing does relate to multiple valves, so it's not quite as simple as a
single rate. The time delta's for the other stuff are all pretty short, so you
may or may not be planing to randomly drive them as well.
It all depends on how fanatic you get about t
On 2/15/13 5:37 AM, Bob Camp wrote:
Hi
Ok, how about a nice simple table? Something in the 500 to 4K entries
shouldn't repeat often enough to be noticeable. Each entry probably can be a
byte.
Bob
Yes.. that might work..
Or, for that matter, I believe you could do it by randomly selecti
listically uniform pulse rate.
There's some faster cheap processors out there that I could drop in, as
well: teensy3 with the 48MHz Cortex is pretty powerful.
On Feb 15, 2013, at 7:43 AM, Jim Lux wrote:
I need to generate a sequence of pulses at around 1 Hz with a 1/f
characteristic (
I need to generate a sequence of pulses at around 1 Hz with a 1/f
characteristic (human heartbeat, as it happens). I'd like to do this
using software and a timer, so I'm looking for a clever algorithm using
a random number generator to do it.
I could take the phase noise spectrum and turn th
On 2/12/13 10:11 AM, Didier Juges wrote:
Before you know it, you are going to find that not having php (or Python, or
Perl, or whatever your favorite scripting language is) is crippling. I
recommend you bite the bullet and get a small ARM SBC big enough to run a full
Linux distro. I use a TS-7
On 2/11/13 10:20 PM, Chris Albertson wrote:
On Mon, Feb 11, 2013 at 10:04 PM, David J Taylor
wrote:
Anything which works on the Raspberry Pi must be fairly lightweight!I
don't think that basic Apache would be too much to manage, and many folk
have used it:
I have to agree with the above.
I'm intrigued by the possibility of using a lightweight web server to
provide a management/user interface to test equipment or appliances
(e.g. like the NTP server recently discussed, or a box with mixers and
counters).
I've built some web interfaces to very small things using Arduinos and
Ra
On 2/10/13 8:22 AM, Chris Albertson wrote:
On Sun, Feb 10, 2013 at 12:40 AM, David J Taylor
wrote:
- although I've never used it, I do like Chris's suggestion of power over
Ethernet. I see dozens of choices in Amazon's lists - is there a standard
for the power adapter and level?
Yes there is
On 2/10/13 12:40 AM, David J Taylor wrote:
- although I've never used it, I do like Chris's suggestion of power over
Ethernet. I see dozens of choices in Amazon's lists - is there a standard
for the power adapter and level?
[]
==
To clarify, now I've done a little re
On 2/4/13 2:39 PM, Bob Camp wrote:
Hi
Consider that cost to manufacture the cable goes up as you put stuff in it. You
not only need sensor packages, you also need to connect them so they can report
data. Unless the sensors are optically powered and linked, they would
compromise the inherent l
On 2/4/13 2:09 PM, Stanley wrote:
If a fiber-optic cable had temperature sensors either installed with or
embedded inside of this could make for better modeling changes in delay making
more accurate transfer of time and frequency possible. With fiber to tower
installs now under way to provide
On 2/2/13 5:07 AM, Grant Hodgson wrote:
GPS has already flown in space several times; one of the well-publicized
occurrences is when NASA sponsored an experiment to put a 6-channel
Trimble receiver on the ill-fated AO-40 amateur radio satellite which
launched in 2000.
This satellite had a hig
On 1/31/13 8:37 PM, Rick Harold wrote:
To time experts/EE's.
I would like to triangulate a position of a device which moves using 3
fixed positions devices of known location.
The idea is to have these operate on 915mhz or 434mhz or 2.4ghz or
appropriate frequency.
These two type of devices (fixe
On 1/31/13 1:09 PM, Chris Albertson wrote:
I know for sure my handheld Garmin works at 27000 feet, at
530mph... ...I was actually surprised it worked up there.
It made me wonder what the actual limits are.
What are the limits of your hand held unit or what are the limits of
GPS in general.
On 1/30/13 8:28 PM, Chris Albertson wrote:
For once the "best" is also cheap: Batteries.
But not all batteries are the same. You want one with low internal
resistance, so a lead acid flooded battery will be the best.
Most NiCd have very low internal resistance.. much lower than lead acid.
On 1/27/13 11:28 AM, Peter Gottlieb wrote:
It came down to startup issues. If every fifth time the system was
turned on it wouldn't initialize properly and not see an airflow or
whatever sensor, it required the calling of a tech from the test group
to come over and get it going. We run Labview
eed 10s or 100s of millisecond timing and shoving data back and forth..
On Sun, Jan 27, 2013 at 1:48 PM, Jim Lux wrote:
On 1/27/13 9:30 AM, Peter Gottlieb wrote:
At work we simply use multi port serial cards (*no* USB intermediary) or
Ethernet to serial adapters. Any use of USB for cri
On 1/27/13 9:30 AM, Peter Gottlieb wrote:
At work we simply use multi port serial cards (*no* USB intermediary) or
Ethernet to serial adapters. Any use of USB for critical test equipment
was pretty much banned here years ago.
Why the proscription against USB?
Because of difficulty with USB de
Q to verify
> connectivity:
> http://prologix.biz/gpib-ethernet-1.2-faq.html
>
> Regards,
> Abdul
>
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Jim Lux
> Sent: Sunday, January 27, 2013 8:16 AM
> To: Di
On 1/26/13 11:23 PM, Chris Albertson wrote:
On Sat, Jan 26, 2013 at 2:12 PM, J. Forster wrote:
Unless you are doing fundamental physics research, are you sure you need a
cryo temperature standard?
You are right. What I asked I should have said that 1% accuracy would
be good enough.I'm p
I spent a couple frustrating hours debugging a test setup with
programmable power supplies and counters (to make automated measurements
of freq/Vtune on some VCOs, as well as "Vsupply pushing")
I'm using something hacked from the sample Python code and the Prologix
Ethernet device (which has
On 1/24/13 8:13 AM, John Nelson wrote:
I hesitate to ask this question on here since it's perhaps more one for
position-nuts rather than time-nuts. My excuse is that it involves a
Thunderbolt ;-)
I've been a happy user of a Thunderbolt for a while as an accurate time and
frequency source but unt
On 1/24/13 7:24 AM, Mike S wrote:
On 1/23/2013 3:34 AM, Magnus Danielson wrote:
On 01/23/2013 02:32 AM, Mike S wrote:
Can you have a Cs under zero acceleration and at zero temperature, the
only conditions for which the second is defined? Since most metric units
are derived from the definition o
On 1/23/13 9:45 PM, li...@lazygranch.com wrote:
I doubt the impedance would be designed so nobody gets a right match. Anyway,
the geometric mean, which is how you would do such a compromise is 61.24 ohms.
I suspect that it's more like.. the mfr builds a prototype that has the
right pattern,
On 1/23/13 8:50 PM, Jim Lux wrote:
On 1/23/13 7:26 AM, li...@lazygranch.com wrote:
For a single frequency use like GPS, the impedance should be close to
the target. It is true for scanners and such, 50 ohms is quite
nominal. (This notion of DC to daylight and maintaining 50 ohms is
fantasy
On 1/23/13 7:26 AM, li...@lazygranch.com wrote:
For a single frequency use like GPS, the impedance should be close to the
target. It is true for scanners and such, 50 ohms is quite nominal. (This
notion of DC to daylight and maintaining 50 ohms is fantasy. ) But for a GPS,
you know exactly the
On 1/23/13 6:48 AM, David Kirkby wrote:
There's a fairly interesting (to me at least), discussion on an
Agilent forum devoted to the calibration of vector network analyzers.
http://www.home.agilent.com/owc_discussions/thread.jspa?threadID=34809&tstart=0
The title of the thread is "Coefficients
On 1/23/13 12:41 AM, Hal Murray wrote:
mspencer12...@yahoo.ca said:
This URL goes into some of the issues involved in using 75 ohm coax in a gps
system. I do acknowledge that several GPS manufacturers have promoted the
use of 75 ohm coax so some of the conclusions might be arguable..
If the
On 1/22/13 9:08 AM, Joe Leikhim wrote:
John;
You might look into building your own, _scaling up_ from a G3RUH design
(2.4 GHz)
note that they were illuminating a 60 cm dish in those experiments,
that's not a very big reflector for 12.5 cm wavelength at 2.4 GHz. not
even 5 lambda. I'm not sur
On 1/21/13 10:59 PM, Chuck Forsberg WA7KGX N2469R wrote:
RG-6 used for satellite TV has much lower loss than RG-58,
and is much cheaper and easier to work with than Heliax or LMR400.
And has a foil shield (if not multiples) with 100% coverage.
___
tim
On 1/21/13 9:14 AM, jmfranke wrote:
Would anyone happen to have a LHCP patch antenna, with or without
preamp, they would be willing to sell? I want to use it as the feed for
a 4 foot diameter F: 0.375 dish antenna for a dedicated WAAS receiving
set up.
why a patch? Patches are nice when you
On 1/17/13 6:22 AM, Bob Camp wrote:
Hi
Most cheap GPS's these days have user friendly firmware update capability.
That's been true for quite a while. I'd be amazed if the higher end stuff
didn't make updates an easy thing. Bugs in GPS code are not exactly
uncommon.
The real issue is the need to
On 1/11/13 7:00 AM, Nathaniel Bezanson wrote:
J. L. Trantham wrote:
Is there a way to connect a parallel port to a computer via USB?
Not a device that shows up as 'USB Print Support' but, instead,
shows up in Device Manager as an LPT port? I have been able to do
it via PCMCIA to Parallel Port
On 1/7/13 4:30 AM, Bob Camp wrote:> HI
>
> Well if you are getting it done in seconds on Matlab, then you likely
don't need Matlab very badly. Around here a typical Matlab setup is
indeed CPU bound for a *lot* longer than that during a normal work day.
Two or three hours a day is not at all unu
On 1/6/13 9:26 PM, Hal Murray wrote:
jim...@earthlink.net said:
Precisely.. but I'd just as soon not be in the PC integration business,
finding boards to plug into a mobo, etc. I was wondering what folks have
used (or seen used) in this sort of usage model.
Google for embedded PC and/or mini-
On 1/6/13 8:56 PM, gary wrote:
There is an open source equivalent of Matlab called Octave.
Yes..we use it too, and for anyone who uses Matlab, Octave is nice to
have as well. For instance, we have a centralized license server for
Matlab, and if you're incommunicado, you're stuck, but with Oct
On 1/6/13 6:09 PM, Bob Camp wrote:
Hi
Ummm, er you want to run Matlab and you are likely paying $100 an
hour to whom ever is waiting on the machine. My *guess* is that a
micro board of what ever flavor will do an arbitrary Matlab run in
maybe 30 days.
Yes.
But any of a zillion PC clones wil
On 1/6/13 5:52 PM, gary wrote:
This might be a good place to start looking.
http://beagleboard.org/project/BeagleTick/
I got a beagleboard mx, but it is for a different project. I'm not up to
speed on it enough to comment if this is the best solution. I can tell
you the hardware design and mor
On 1/6/13 5:43 PM, Chris Albertson wrote:
There is not "hottest ticket". It depends on what you need. The TI
"launch pad" is less then $5 shipped which makes it really popular.
Somehow I suspect the MSP430 launchpad won't run windows/Linux and
Matlab, eh?
If
you need loots of compute powe
Consulting the hive mind..
If you're building a standalone widget (e.g. something like an NTP
server we've been discussing, etc.) with an embedded PC, don't want to
fool with hardware designing, etc.; use off the shelf OSes (win and
Linux) and software (Matlab, Labview); have solid state boot
On 1/4/13 11:34 AM, Ed Palmer wrote:
They are neat toys, aren't they? :-) I discovered them a couple of
years ago. Since then I've collected a few from ebay to play with.
They're oddball units with no documentation, but they weren't too hard
to decipher. I even cobbled together a phase-lock s
On 1/4/13 10:25 AM, Rick Karlquist wrote:
Chris Albertson wrote:
My question is about the phase noise of the final 16MHz signal. Do
crystal filters "clean up" the signal. It seems that after several
16MHz crystals in series the output should look a lot like an XO.
For offsets out to 100 Hz
On 1/3/13 12:53 AM, Poul-Henning Kamp wrote:
In general, you should reuse as much code as you can, life is too short
to write another UDP checksum subroutine.
You captured it exactly..
The thrill of implementing sin() is long past.
Heck, I'd be happy with something that ran Matlab/Octave/Sci
On 1/2/13 5:34 PM, Tom Harris wrote:
+1 for Forth!
+1 for your opinions on PICs & AVRs. We can buy low end NXP ARM Cortex M0
chips (e.g. LPC1113) for less than the PIC18 we were using before, and it
has a real compiler and (unlike the real world) evidence of intelligent
design!
Do you really ne
On 1/2/13 4:46 PM, Bob Camp wrote:
Hi
That's the point I've been trying to make for about a month now. At some point,
for a hobby project, the cost of the CPU becomes irrelevant. In my book, once
the CPU goes below the price of lunch at McDonalds, it really doesn't matter
much.
yes.. it's
On 1/2/13 11:37 AM, Poul-Henning Kamp wrote:
Actually, the OS is not important, floating point support is.
floating point support in the sense that the compiler supports it and
generates appropriate code to use software FP or hardware FP as available?
Or you need HW floating point for per
On 1/1/13 12:16 PM, Poul-Henning Kamp wrote:
In message , Bob Camp writes:
I'm not bashing the Arm parts, [...] They worry about every uA of
current drain
True story:
Many years ago when the very first ARM silicon arrived and they started
testing it, it was generally execeeding expe
On 12/31/12 8:13 AM, Magnus Danielson wrote:
On 31/12/12 16:56, Bob Camp wrote:
Hi
I suspect that your ion standard will have some issues from magnetic
field. Quartz it's self has no magnetic sensitivity. Most atomic
gizmos have sensitivity as part of their basic physics.
All atomic clocks th
On 12/31/12 7:56 AM, Bob Camp wrote:
Hi
I suspect that your ion standard will have some issues from magnetic field.
Quartz it's self has no magnetic sensitivity. Most atomic gizmos have
sensitivity as part of their basic physics.
yes.. shielding of the physics package is part of the game..
On 12/31/12 12:55 AM, Hal Murray wrote:
jim...@earthlink.net said:
When designing the system to do coherent two way ranging to the Juno
spacecraft orbiting Jupiter, we found that the rotating magnetic field
(because the spacecraft spins at 2RPM in Jupiter's magnetic field) was
enough to modulat
On 12/30/12 8:28 PM, Bob Camp wrote:
Hi
Indeed, there will always be some EMF into the EFC from some field. You can
never really get rid of a loop with some cross section in the EFC circuit. Most
of us don't get to worry about 1x10^-16 at 1,000 seconds on our OCXO's….
Yes. I think it's not
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