In message 53f8060b.7020...@leikhim.com, Joe Leikhim writes:
I applaud those applying their rather extensive math skills at
this problem, but from the outside, it appears to me that the problem
is so very complex (error prone) and so many assumptions are being
applied, that folks time
Joe,
I did find it here:
http://www.dca.gov.my/mainpage/MH370%20Data%20Communication%20Logs.pdf
There is also some Inmarsat presentation giving a little more detail.
At the same time, the data gathered is from a system not designed for
navigation and positioning purposes. It gives a rough
Hi
Keep in mind that watching the OCXO in a fixed ambient may not tell the whole
story. Setting a PLL to 10,000 seconds on an OCXO and then ramping the
temperature 40 or 80C is likely to create issues…..
It’s very easy to fall into the “I only have a room that swings 0.2C” loop when
looking
Hi Charles,
I agree with your statement regarding the determination of the optimum
time constant, but, as Bob Camp mentioned, temperature change has a
significant impact on setting the value. My 'lab' is a
non-airconditioned bedroom. My Tbolt doesn't have any active
temperature control.
Ed wrote:
I don't think you're correct about the Miller GPSDO containing a
Shera controller.
Is there more than one Miller GPSDO? I was referring to this one,
by James Miller G3RUH, which uses a Shera controller and 10811 OCXO:
http://www.jrmiller.demon.co.uk/projects/freqstd/frqstd.htm
Thanks for that suggestion, Ed. After a bit of reading in the X72 Reference
Guide, it appears that the X72 does have a 1PPS input. That would be
considerably easier than trying to interface the Rb into the GPSDO. Still
trying to understand what the manual is telling me. Next thing is to
Now that I see it again, I think I knew about Miller's Shera version,
but I purged it from my brain in horror and disgust. He bought a
Z3801A, threw away the controller and added a Shera board. The Shera
board is good, but .
Ed
On 8/23/2014 1:40 PM, Charles Steinmetz wrote:
Ed wrote:
Hi Dave,
On 8/23/2014 3:51 PM, Dave M wrote:
Thanks for that suggestion, Ed. After a bit of reading in the X72
Reference Guide, it appears that the X72 does have a 1PPS input. That
would be considerably easier than trying to interface the Rb into the
GPSDO. Still trying to understand what
I've had the LEA-6T sitting in survey-in mode for about 17 hours, and at this
point, the u-center software says that the Mean 3D Std Dev is 0.109 meters.
Given that my antenna is just a puck at the peak of the attic (never got around
to adding the DIY choke-ring), has this reached the silly
Hi
If you lock an Rb to GPS, you need / want / should do it with a *very* long
time constant. Numbers in the one day to several days range are commonly seen.
If you lock it up with a tighter (shorter time constant) loop, it will just
wander around as it follows the GPS input. That’s what would
http://www.nasaspaceflight.com/2014/08/arianespace-soyuz-st-b-galileo-mission/
big oops at the minimum.
Jim
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kb...@n1k.org said:
If you have a temperature stable environment (or create one) you can get
some very good results with an (good) Rb locked to a (good) GPS via a proper
long time constant setup. Its not easy, but it can be done.
What's the temperature sensitivity of the typical
actually if the oscillator is stabil enough, with a very long time
constant one could kill the phase modulation of the new WWVB format
73
Alex
On 8/23/2014 6:27 PM, Bob Camp wrote:
Hi
If you lock an Rb to GPS, you need / want / should do it with a *very* long
time constant. Numbers in
Ed wrote:
I agree with your statement regarding the determination of the
optimum time constant, but, as Bob Camp mentioned, temperature
change has a significant impact on setting the value. My 'lab' is a
non-airconditioned bedroom. My Tbolt doesn't have any active
temperature control. If
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