Fellow time-nuts,
A guy can't show up at a conference without being spotted and hands
being shaken by fellow time-nuts.
Interesting days of tutorials and ice-breaker meeting.
Lunch with Enrico Rubiola was interesting and fun.
Cheers,
Magnus
___
Hi Michael,
Thank you for your suggestion. This is my first post to the group so I
hope I am replying correctly.
I have downloaded WinLabMon (for Windows XP?) and WinOncore12 but I have
not been able to communicate with the GPS receiver yet. Yes, please
send me the program you mentioned and
Hi Jerry
PM sent.
I developed some years ago a GPSDO using the TU series GPS receivers, you
can see the product on this link under the GPS:
http://rudius.net/oz2m/ngnb/index.htm
Regarding the TU-60 you need to convert from the Motorola format to Navmann
format first and then from Navmann format
I remember a few discussions over the last few years about building a
microcontroller (PIC, Arduino, MPS430, whatever floats your boat) based
IRIG generator. Did anyone ever get one working?
There is a C source code file in the NTP distribution to generate IRIG via a
sound card IIRC... That
A friend pointed me to this site:
US http://www.blitzortung.org/Webpages/index.php?lang=enpage_0=30
EU http://www.blitzortung.org/Webpages/index.php?lang=en
This is a wonderful out-of-the-box project, with echoes of Loran-C and GPS
triangulation. It's also a clever combination of home-brew
Indeed, very interesting. I stumbled across this the other day. After a
preliminary read of one of their documents:
A World-Wide Low-Cost Community-Based Time-of-Arrival Lightning Detection and
Lightning Location Network
Found here: http://www.blitzortung.org/Webpages/index.php?lang=enpage=3
In message 06013AA10880459380352E3FB29C4B5C@pc52, Tom Van Baak writes:
2) Can you imagine applying this entire process in reverse. That
is, instead of using GPS to timetag lightning strikes, use lightning
strikes to synchronize a global network of local clocks.
The first input you need is the
The first input you need is the exact longitude/latitude of the
lightning bolt.
The easiest way to do that is with a set of GPS synchronized receivers,
nd we're back to sqare one!
That's true for ultimate accuracy. But notice how each strike is seen by dozens
of observers and each
as, ahem, one of the early experimenters of lightning detection, gotta tell
ya, the return stroke risetime is on the order of 1 us. Also, the very
beginning of the waveform, that is the first part of the spike, is connected
with the beginning of the breakdown, hence the location on the ground.
Hi all,
what would be the best method to try injection locking a butler common
base crystal oscillator (see figure in
http://www.eska.dk/oscillator_data.htm for schematic)?
Any comment about close-in phase noise performance when adding
injection locking to such oscillators?
Thanks in advance for
I am seriously considering involved as I am a bit of a weather nut too.
I suspect this is quite common. You don't have to get into precise time very
deep before you realize that all your timing gear is just pile of environmental
sensors in disguise. Before time-nuts began, the first timing guy
Oh man does this bring back memories of 12au7s and loop antennas pre
internet 1970 as I recall. A QST magazine article. I built it and it used a
crt for readout.
There wasn't really a way back then to share the data.
But will say this is quite a nice setup.
Regards
Paul
WB8TSL
On Tue, Jun 24,
The response has been very positive such that a $ 45 kit is doable. Working
on getting at least two beta tests lined up.
However it is disappointing that no one has stepped up to tackle the
temperature problem. how many have looked at the temperature attachment and
clicked on the N5TNL link.
However it is disappointing that no one has stepped up to tackle the
temperature problem. how many have looked at the temperature attachment and
clicked on the N5TNL link. Let me make it clear that yes the GPSDO will work
but
there will be one or two orders of magnitude degradation
Tom,
airflow, or changes in airflow are typically much worse for ADEV than
actual ambient temperature changes in still air.
In still air for example a typical Eurocan DOCXO will have a case temp of
about 55C to 60C at 25C ambient.
Turn on any kind of significant airflow over that part and
Thank you Bruce.
Like others, I was saddened to hear of Ulrich's passing.
His contributions and the good spirit under which he contributed were notable.
He will be missed.
Didier KO4BB
On June 23, 2014 4:58:24 PM CDT, br...@ko4bb.com br...@ko4bb.com wrote:
Sadly Ina was terminally ill and
bang-bang servos do depend on inherent low-pass filtering by the controlled
device.
Don
saidj...@aol.com
Tom,
airflow, or changes in airflow are typically much worse for ADEV than
actual ambient temperature changes in still air.
In still air for example a typical Eurocan DOCXO will have a
Check out the temperature control code in Lady Heather. It uses a nice PID
controller algorithm (from Warren Sarkison) to PWM modulate a fan to stabilize
the environment around the Tbolt. It can achieve millidegree range
stability... I have seen long term RMS values of the temperature plot
On Tue, Jun 24, 2014 at 3:24 PM, Mark Sims hol...@hotmail.com wrote:
...
However it is disappointing that no one has stepped up to tackle the
temperature problem.
I can post what I have. It's a uP based PWM fan controller. It is a stand
alone device that does not know anything about the
Again we are talking past each other I am talking about temperature
compensation with the DDS that ideally should be removed. Those steps upset
any
loop.
Bert
In a message dated 6/24/2014 6:38:48 P.M. Eastern Daylight Time,
hol...@hotmail.com writes:
Check out the temperature control
Hi
If:
1) You are after better than 1.0 x 10^-13 accuracy
2) You are getting 1 to 9x10^-9 at one second ADEV out of your GPS
3) You have a telecom Rb with 1 to 5x10^-10 temp coef over a 70C delta
4) Your Rb self heats 20 to 30C in still air
Here’s some math:
You will need at least 10,000
After having tried just about every solution under the sun, my opinion is that
within the ambient temperature range (up to at least 100°C) and homebrew
budgets, nothing beats an NTC thermistor.
They are inexpensive, have a large output and interface most easily with a
microcontroller's ADC in
Lets be clear the 1 E-13 is a totally different project and does not relate
to the FE 5680 A. Yes most likely we will use the same universal
controller but with different code, same board. GPS crosses the 1 E-13 line at
10 seconds little more than a day. I whish it was just temperature
We use NTC 10K with the FRK. Precision is not important.We have to play
with the settings in order to have fan starting voltage over the full temp.
range.
Bert Kehren
In a message dated 6/24/2014 8:12:45 P.M. Eastern Daylight Time,
shali...@gmail.com writes:
After having tried just
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