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List: time-nuts@lists.febo.com
From: Bruce Griffiths
Re: [time-nuts] GPS noise reduction
Sun, Apr 6, 2008 12:23 AM
The PPS timing noise will then be
sufficient by itself (if the TIC uses synchronisers) for the averaged
TIC outputs to be effectively unbiased estimators of the phase errors of
their respective oscillators.
When using a PPS signal it only remains to determine the optimum
algorithm for discipling the OCXOs.
List: time-nuts@lists.febo.com
From: Bob Raker
Re: [time-nuts] Setting Oscillator Frequency
Fri, Nov 13, 2009 5:45 PM
If settability is not specified, it can be estimated from the tune
range and the number of turns of the adjusting device. A rule of thumb is
to use one point of resolution for every three degrees of rotation.
List: time-nuts@lists.febo.com
From: Magnus Danielson
Re: [time-nuts] Newbie questions
Wed, Jan 6, 2010 1:16 PM
So we felt ok with using the 1 ns/ft estimate.
Well, I think you should reconsider. Theory says that
v = 1/sqrt(my*epsilon) = 1/sqrt(my_r * epsilon_r) * c
For a coaxial cable, we have the magnetic properties about the same as
vacuum, so my_r = 1 is a fair approximation.
List: time-nuts@lists.febo.com
From: Pete Rawson
Re: [time-nuts] Timing Distribution in Mountainous Terrain
Fri, Sep 10, 2010 10:56 PM
The other sites respond with their estimated time. The master
provides corrected time.
Knowing past history of path properties & precise (ballon) location
at each transmission (data sent with transmission); the rest should
be easy.
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From: jim s
Re: [time-nuts] GPS USB dongle for time server
Tue, Nov 9, 2010 5:50 AM
Assuming you hack the USB driver to get a time hack exactly when a
certain string comes from the USB, you would need to figure out how to
estimate the latency from the device to the interrupt service routine to
eliminate that, as it would jitter.
List: time-nuts@lists.febo.com
From: Magnus Danielson
Nerd facts - 45 years since Allan variance article
Sat, Feb 19, 2011 1:09 PM
After these articles the field has been
improved significantly by improved analysis on biases,
noise-separations, statistical certainty and improved estimators to
achieve the high statistical certainty.
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From: Tijd Dingen
Re: [time-nuts] BYMLBI (Back Yard Medium LBI)
Sat, Mar 19, 2011 2:53 PM
Combine your
local datapoints + gps derived datestamps (and estimate of uncertainty) with
those of fellow enthusiasts around the planet.
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From: Bruce Griffiths
Re: [time-nuts] cheap 5V OCXO in 14DIP has about 1E-9 drift per day
Sun, Apr 10, 2011 8:08 PM
url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F26%2F23863%2F01093262.pdf%3Farnumber%3D1093262&authDecision=-203>
>
>
> http://tf.nist.gov/general/pdf/1800.pdf
>
> Bruce
Additional references that estimate the degree of tank mistuning
permissable before asynchronous modes occur:
http://www.its.caltech.edu/~kaushiks/KS_RFIC.pdf
List: time-nuts@lists.febo.com
From: Jim Lux
Re: [time-nuts] WWVB BPSK Receiver Project?
Thu, Mar 15, 2012 3:09 PM
.
>
and the cleverness of the Costas loop is that it uses (an estimate of)
the current data bit (the output of the I arm) to flip the sign of the
error signal from the quadrature arm.
There's a lot of scope for modification of the basic linear Costas loop.
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From: SAIDJACK@aol.com
Re: [time-nuts] Experience with THS788 from TI?
Wed, Mar 21, 2012 9:49 PM
If you average over many samples, all of these will get you a better
estimate. How much better depends on a bunch of things. The TI part *could*
do very well if you have a 200 MHz signal to look at.