Hi
Looks like uBlox has released the basic info on the protocols and interfacing
of the F9T.
https://www.u-blox.com/en/product/zed-f9t-module#tab-documentation-resources
There are still a few documents referenced in what they did release that have
not yet
popped up on the web site.
Still l
For independent standards (not quite what you asked) I recall from
"The Science of Clocks and Watches" (a book with much technical info
if you're interested in these mechanical devices) that the most
accurate mechanical/pendulum clock was the Shortt Clock that used a
pendulum in a vacuum chamber fo
If I am reading the paper correctly they used the moon as the reference. I
would have thought it was the sun. But the moon gives a very clean edge
definition. And now I know how the 770 came about. One more bit in the
knowledge bunker.
Thanks
Paul
WB8TSL
On Mon, Mar 25, 2019 at 8:03 PM Tom Van Baa
On Mon 2019-03-25T16:54:28-0700 Tom Van Baak hath writ:
> In retrospect we would have had fewer leap seconds if they had
> chosen 9192631950 Hz instead of 9192631770 Hz. But at the time it
> wasn't a choice; it was just a measurement.
And it was a measurement which was performed during an interva
I have long felt that the 289 is a classic example of design by committee. It
has every possible feature that no one wants or needs and a price that
represents that, but not the features people actually care about in a meter
(fast turn on, rugged, light weight, reliable, long battery life.)
Mat
> Does anyone have a pointer to information about the absolute time
> accuracy (not stability) that was available via PZT or other techniques
> prior to the Cesium definition? I'm doing a presentation and want to
> show the evolution of accuracy. My Google-fu has failed me in finding
> anythi
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/FFA10ED6A784AA1E39637CC0CA93B750/S0074180900036007a.pdf/div-class-title-some-advantages-and-disadvantages-of-a-photographic-zenith-tube-div.pdf
indicates a timing error of around 6 millisec
Bruce
> On 26 March 2019 at 12:15 Br
On Mon 2019-03-25T18:44:05-0400 John Ackermann N8UR hath writ:
> Does anyone have a pointer to information about the absolute time accuracy
> (not stability) that was available via PZT or other techniques prior to the
> Cesium definition? I'm doing a presentation and want to show the evolution
> o
John
http://adsabs.harvard.edu/full/1968JRASC..62..205T
indicates a timing accuracy of a few milliseconds was typical for the Calgary
PZT.
Bruce
> On 26 March 2019 at 11:44 John Ackermann N8UR wrote:
>
>
> Does anyone have a pointer to information about the absolute time
> accuracy (not stabi
Does anyone have a pointer to information about the absolute time
accuracy (not stability) that was available via PZT or other techniques
prior to the Cesium definition? I'm doing a presentation and want to
show the evolution of accuracy. My Google-fu has failed me in finding
anything pre-Ato
You're so right about the 289. It costs too much, sucks the life out of
batteries and is way too big.
I have about a dozen handheld MMs, from a piece of Harbor Freight trash to
a Gossen Metrahit M248A (believe it or not, a gift from a widow, off her
late husband's bench. NIB). My 87 is the one
On 3/25/19 3:08 PM, Bob kb8tq wrote:
Hi
Very nice plots and some useful information. At some point the question becomes
what the 8607 is doing. Both are seeing changes in temperature (and pressure).
Eventually that will get into the picture. From the plots so far …. not so much
yet.
The 8607
I have both the 87 and the 189 (I agree re: the 289 - not to mention the
expense...). The 189 stays in the shop, with rare exceptions. The 87,
built like a tank, goes on the road in a padded case.
Get an 87 and a set of very skinny, pointed probes for those tight places.
You will be very happy.
Hi
Very nice plots and some useful information. At some point the question becomes
what the 8607 is doing. Both are seeing changes in temperature (and pressure).
Eventually that will get into the picture. From the plots so far …. not so much
yet.
Will we be getting weekly updates for the next
The 87 is a good general purpose meter. My preference has been the now
obsolete Fluke 189. It was replaced with the 289, which is just
horrible. It eats batteries, is huge, takes forever to 'boot'. No one in
the ship grabs that one unless it's the last one on the shelf.
We've gone to orange me
Very nice! I look forward to reading all of those. I hadn't known of that
publication.
Bob
On Monday, March 25, 2019, 3:03:12 AM PDT, Tom Van Baak
wrote:
Some of you know that I'm a pack-rat for vintage instruments, books,
documentation, and publications about atomic clocks. Especia
n Mon, 25 Mar 2019 at 10:03, Tom Van Baak wrote:
> Some of you know that I'm a pack-rat for vintage instruments, books,
> documentation, and publications about atomic clocks. Especially anything by
> Hewlett-Packard. I've enjoyed all the time-nuts posting by Rick Karlquist
> and Hugh Rice, et al.
Some of you know that I'm a pack-rat for vintage instruments, books,
documentation, and publications about atomic clocks. Especially anything by
Hewlett-Packard. I've enjoyed all the time-nuts posting by Rick Karlquist and
Hugh Rice, et al.
The usual online hp sources [1] host the massive annua
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