Ulrich,
2009/4/11 Ulrich Bangert df...@ulrich-bangert.de:
So why would my counter show any significant differences
between a 1 sec or 2 sec gate time?
suppose your source has a 0.5 Hz frequency modulation. Would you see it with
2 s gate time or a integer multiple of it? Would you notice it
Tom,
2009/4/11 Tom Van Baak t...@leapsecond.com:
Nevertheless leaving every second sample out is NOT exactly the same as
continous data with Tau0 = 2 s. Instead it is data with Tau0 = 1 s and a
DEAD TIME of 1s. There are dead time correction schemes available in the
literature.
Ulrich, and
2009/4/11 Magnus Danielson mag...@rubidium.dyndns.org:
Tom Van Baak skrev:
Nevertheless leaving every second sample out is NOT exactly the same as
continous data with Tau0 = 2 s. Instead it is data with Tau0 = 1 s and a
DEAD TIME of 1s. There are dead time correction schemes available in the
Steve
Steve Rooke wrote:
2009/4/11 Magnus Danielson mag...@rubidium.dyndns.org:
Tom Van Baak skrev:
Nevertheless leaving every second sample out is NOT exactly the same as
continous data with Tau0 = 2 s. Instead it is data with Tau0 = 1 s and a
DEAD TIME of 1s. There are dead time
Steve
Steve Rooke wrote:
If I take two sequential phase readings from an input source and place
this into one data set and aniother two readings from the same source
but spaced by one cycle and put this in a second data set. From the
first data set I can calculate ADEV for tau = 1s and can
Bruce Griffiths wrote:
...
Brice
An impostor? An alias? :-)
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Rex wrote:
Bruce Griffiths wrote:
...
Brice
An impostor? An alias? :-)
And I thought I was alluding to aliasing of the phase noise spectrum not
the characters of the alphabet.
Bruce
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Steve Rooke skrev:
2009/4/11 Magnus Danielson mag...@rubidium.dyndns.org:
Tom Van Baak skrev:
Nevertheless leaving every second sample out is NOT exactly the same as
continous data with Tau0 = 2 s. Instead it is data with Tau0 = 1 s and a
DEAD TIME of 1s. There are dead time correction
Bruce Griffiths skrev:
Rex wrote:
Bruce Griffiths wrote:
...
Brice
An impostor? An alias? :-)
And I thought I was alluding to aliasing of the phase noise spectrum not
the characters of the alphabet.
So it is not a case of shot noise of Bruce fingers? :)
I know mine
Hej Magnus
Magnus Danielson wrote:
Bruce Griffiths skrev:
Rex wrote:
Bruce Griffiths wrote:
...
Brice
An impostor? An alias? :-)
And I thought I was alluding to aliasing of the phase noise spectrum not
the characters of the
Hello Steve,
Try this... take Tom's sample data set, run the numbers. Then, using a good
random number generator, make another data set by randomly throwing out half
(or more) of the samples (to simulate a non ZDT counter). Run the numbers
again. See how they change. This should give
Fluke.l (China) was selling a number of 1938's on Ebay. I snagged one
just to have a piece of HP history.
It works just fine, but I've noticed something a little strange.
Comparing the 1938 to both my cesium and GPS standards, there's a
distinct periodic 1ns phase shift every second. Seems to
wje wrote:
Fluke.l (China) was selling a number of 1938's on Ebay. I snagged one
just to have a piece of HP history.
It works just fine, but I've noticed something a little strange.
Comparing the 1938 to both my cesium and GPS standards, there's a
distinct periodic 1ns phase shift every
Bruce,
2009/4/12 Bruce Griffiths bruce.griffi...@xtra.co.nz:
Steve
Steve Rooke wrote:
If I take two sequential phase readings from an input source and place
this into one data set and aniother two readings from the same source
but spaced by one cycle and put this in a second data set. From
2009/4/13 Magnus Danielson mag...@rubidium.dyndns.org:
Dead time is when the counter looses track of time in between two
consecutive measurements. A zero dead-time counter uses the stop of one
measure as the start of the next measure.
This becomes very important when the data to be measured
I, too, snagged one of these since it has the reputation of being the
ultimate achievement of crystal oscillator technology with the goal of
building a GPS controlled reference using a Brooks Shera controller card and
a GPS receiver.
Toward that end, since it takes a few minutes for the 1938 to
J. L. Trantham wrote:
I, too, snagged one of these since it has the reputation of being the
ultimate achievement of crystal oscillator technology with the goal of
Thanks, we thought it was pretty good :-)
Toward that end, since it takes a few minutes for the 1938 to 'lock', is
there a
If nobody has already mentioned it, Fluke.1 has the Rockwell
Tu00-D205 high performance 12-channel GPS receiver OEM modules for
$9.99 ea with free shipping worldwide, item number: 290306684157
These appear to have the 10KHz output described at
Thanks for the info.
My plan is to develop a stable GPS disciplined reference suitable for use as
a reference for Microwave work in the 10 GHz range that can be used in
portable locations with relatively quick start up.
Perhaps the 1938 would be better in the shop where it could be left on for
Chris
The biggest problem with the OCXO is probably that it has a square
wave output.
With careful design it is possible to achieve a jitter of a few
tens of femtosec for a logic level output from a limiter, but the
OCXO designers are unlikely to have used such a limiter.
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