Suitable TDC chips are available from http://www.acam.de/ http://
www.acam.de/ In particular the TDC-GP1 has a resolution of better
than 250picosec with a range of 200 millisec, which should be more
than adequate for measuring the time delay between GPS and local
standard derived PPS
Hal Murray wrote:
Suitable TDC chips are available from [1]http://www.acam.de/ [2]http://
www.acam.de/ In particular the TDC-GP1 has a resolution of better
than 250picosec with a range of 200 millisec, which should be more
than adequate for measuring the time delay between GPS and local
Yet another high resolution time interval interpolation technique is to
sample a pair of quadrature sinewaves at the leading edge of the pulse
to be time stamped.
When sampling a pair of 10MHz sinewaves in quadrature with a 12 bit ADC
a timing resolution of better than 50 picosec is possible.
Brian O'Connor [1]vk4gtw at bigpond.com wrote:
I note that Shera's QST article refers to using the 1 MHz
output from a HP5328A. Is there any degradation of
performance or increased thermal sensitivity due to the use
of a HP marked 7490 (ripple counter) to divide down to 1 MHz?
Would use of
Dr Bruce Griffiths wrote:
Brian O'Connor [1]vk4gtw at bigpond.com wrote:
I note that Shera's QST article refers to using the 1 MHz
output from a HP5328A. Is there any degradation of
performance or increased thermal sensitivity due to the use
of a HP marked 7490 (ripple counter) to divide
Dr Bruce Griffiths wrote:
Brian O'Connor [1]vk4gtw at bigpond.com wrote:
I note that Shera's QST article refers to using the 1 MHz
output from a HP5328A. Is there any degradation of
performance or increased thermal sensitivity due to the use
of a HP marked 7490 (ripple counter) to divide
Another way of determining the the arrival time of a pulse with high
resolution is to use centroid timing techniques.
The input pulse is converted to a short pulse using a delay line timed
monostable then the resultant pulse is low pass filtered by a discrete
component RLC Gaussian low pass
Dr Bruce Griffiths [EMAIL PROTECTED] wrote:
Yet another high resolution time interval interpolation technique is to
sample a pair of quadrature sinewaves at the leading edge of the pulse
to be time stamped.
These are all variants of what I (because of my high-energy physics
background!) call
Hi Bruce:
I'm interested in automatically measuring the earth's period by looking
close to straight up with a fixed telescope.
There are automatic star trackers that can see stars in the day time
so the only time you would not see the star is when there's cloud cover.
By using a reticule it
I wonder if it is possible to use radio astronomy. You'd
have to find an object that doesn't require a very large
antenna to acquire its signal.
Collins Radio once built a sun tracker for the Navy that used
microwave radiation from the sun. The antenna was driven by a
servo that maximized the
Does any one have any programs written relating to frequency measurements of
any type for the HP 8505A Network analyzer? Better yet, a programming manual
for it.
Chuck Norton
Frequency Standards Services
2727 E. Palmer Park Blvd. Ste 100
Colorado Springs, CO. 80909-5068
719-228-0540 voice
Hal in July you asked
/ With the fibre-based two-way time transfer. For shorter distances you
// can do well on coax, but for the distance range you require you really
// want to go fibre. That world is a bit different but can be made sense
// off.
/
How do I setup 2 clocks so they are
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