I took my recently acquired cesium clock to the hamfest
in Jackson, MS a couple of weeks ago in the hope that I could
cash in big and retire in splendor. But no one bought it.
So, instead I spent some of my hamfest earnings on a GPIB/USB
dongle and I've been using TimeLab and looking at the
Hi
Runs of ten days are not at all uncommon. Since GPS has some 24 / 48 hour
bumps in it, you will get better data with a month long run. You need at
least 10X (and preferably 100X) the data span relative to the stuff you
are looking for.
Bob
-Original Message-
From:
Don't hear LORAN today
On Sun, Feb 3, 2013 at 6:18 PM, Stan, W1LE stanw...@verizon.net wrote:
Hello The Net:
was able to get a lock onto this GRI but not the master station.
GRI 9007 is the EIDI chain with slaves at BO, Norway, Jan Mayen, and
Vaerlandet also in Norway.
Lock was short
Have had lock onto slave Seneca for about 20 minutes on GRI 8970.
compared to GPS/DO: phase offset 3.6 degrees, freq offset 6E-11
Stan, W1LE Cape Cod
On 2/4/2013 9:48 AM, paul swed wrote:
Don't hear LORAN today
On Sun, Feb 3, 2013 at 6:18 PM, Stan, W1LE stanw...@verizon.net wrote:
Hello
Yes indeed they are on the air.
Must have had to have the coffee while the solid state finals warmed up.
Looks like a 10am start of the day, like banks.
Paul
WB8TSL
On Mon, Feb 4, 2013 at 10:05 AM, Stan, W1LE stanw...@verizon.net wrote:
Have had lock onto slave Seneca for about 20 minutes on
Stan indeed the srs700is locked and stabilizing. Fired up the austrons also
and they are locking. So is the LORAN workday 1000 to 1700 EST?? Or is it a
work week 1000 Monday to 1700 Friday?
Regards
Paul.
On Mon, Feb 4, 2013 at 10:33 AM, paul swed paulsw...@gmail.com wrote:
Yes indeed they are
About this subject, are you concerned with multipath? The signal from two
of the basestations might arrive over a line-of-sight path whereas for the
third basestation the signal might bounce around before arriving...
JP
-
To time experts/EE's.
I would like to
Yes, we would need to address that as best we can. I thought of using two
different frequencies to combat that to provide additional data.
There is also the aspect that the mobile device is not expected to move too
fast so if we see a big change we look at it with suspicion.
Most likely one
I think for best timing rather then use a ping Where the device gets
a signal, waits then sends a reply it would be better to re-transmit
the signal in real time. So the base station send some waveform like
carrier that is modulated by a saw tooth wave. The remote device
simply re-transmits
Boy LORAN austron2100 and 2100f and GPS HP3801are tracking really well. The
Austrons are 1.5-2.0 E-12. Pretty much getting at there limits after 5
hours.
Regards
Paul.
On Mon, Feb 4, 2013 at 11:31 AM, paul swed paulsw...@gmail.com wrote:
Stan indeed the srs700is locked and stabilizing. Fired
I suspect my software version on the fs700 does not support the 2nd phase
menu that allows a longer then 1 sec offset count.
Regards
Paul.
On Mon, Feb 4, 2013 at 2:44 PM, paul swed paulsw...@gmail.com wrote:
Boy LORAN austron2100 and 2100f and GPS HP3801are tracking really well.
The Austrons
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 more data at cell towers why not
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
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 lighting immunity the fiber provides.
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
Hi
I'm hoping to get some information on the VCXO that sits in my watch
timing machine. The timer is a Chinese clone of a Witschi timer - the
heart of the thing is an 18MHz VCXO marked 'SCTF 03'. There's a BNC
socket that outputs the crystal frequency and a 1k pot to adjust the
frequency.
Great. Now if the transmissions continue and the format doesn't change!
-John
==
Boy LORAN austron2100 and 2100f and GPS HP3801are tracking really well.
The
Austrons are 1.5-2.0 E-12. Pretty much getting at there limits after 5
hours.
Regards
Paul.
On Mon, Feb 4, 2013
My thinking is the temperature has the largest effect on change in delay of
the cable and more data points would better to predict this change. The
round trip change in delay would collate with a average of the temperature
along the cable but not necessary as accurate, think cable buried at
On 02/04/2013 05:09 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
Yes standard size this is a ABRACON - AOCJY1 from Newark , don't know if
they stock 18 Mhz but you should be able to order one. First check power
supply voltage and pin out.
- Original Message -
From: john j...@ic0n.org.uk
To: time-nuts@febo.com
Sent: Monday, February 04, 2013 5:10
Hi
The transit time of the system is made up (more or less) of:
Forward:
1) electro to optical (likely an LED is involved)
2) transit over the fiber
3) optical to electro (probably a photo diode is involved)
4) electro to optical (likely a different LED is involved)
5) transit over the same
Hi
Missed one important item..
On Feb 4, 2013, at 7:38 PM, Bob Camp li...@rtty.us wrote:
Hi
The transit time of the system is made up (more or less) of:
Forward:
1) electro to optical (likely an LED is involved)
2) transit over the fiber
3) optical to electro (probably a photo
I think someones on it.
check out
http://www.ospmag.com/issue/article/Timing-Is-Everything
Le 4 févr. 2013 à 23:09, Stanley a écrit :
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
John; Are the voltages correct in the circuit? Perhaps something has
drifted such that the control voltage range is incorrect?
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
jleik...@leikhim.com
407-982-0446
WWW.LEIKHIM.COM
Hi John,
First question is do you have a schematic ?
Second question: Is the 1K pot directly across the VCC to ground ? Or is it in
the middle of a resistor string ?
Normally, the EFC pin has a nominal center point that is around 1/2 of the VCC
going to the VCXO module. Also, the EFC pin's
We can only dream. But will take what I can get for as long as I can get
it. It sure in the heck kicks wwvb's capabilities.
Regards
Paul
On Mon, Feb 4, 2013 at 6:20 PM, J. Forster j...@quikus.com wrote:
Great. Now if the transmissions continue and the format doesn't change!
-John
After 11:20 hours still tracking and locked to LORAN.
Frequency offset compared to my T'Bolt GPS/DO is -2.5E12.
Stan W1LE Cape Cod
On 2/4/2013 8:56 PM, paul swed wrote:
We can only dream. But will take what I can get for as long as I can get
it. It sure in the heck kicks wwvb's
My gut feeling is that it's pretty easy to measure propagation delay over
fiber, especially if it's long. Is there some reason you can't just bounce
light off the far end of the cable and measure round trip time? I don't
know the electronics involved in signaling with fiber but surely you could
albertson.ch...@gmail.com said:
I think for best timing rather then use a ping Where the device gets a
signal, waits then sends a reply it would be better to re-transmit the
signal in real time. So the base station send some waveform like carrier
that is modulated by a saw tooth wave. The
How do you know that the frequency range is incorrect for the function?
Assuming this is for calibration of wristwatches, maybe the idea is to
set them to some nominal value at room temperature, then expect them to
drift to the right frequency at skin temperature or so. There would
have to
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