Re: NIST time and frequency seminar - 11-14 June in Boulder
NIST has been doing the Time and Frequency Seminar for a few decades now.
Typically it is a mix of lectures and demos including some tours. They
bring in a number of speakers including current staff and some guest
speakers. John Vig
Hugh,
You must be the only one this ever happened to ;)
Didier KO4BB
On Sun, Feb 10, 2019, 7:06 PM Rice, Hugh (IPH Writing Systems) <
hugh.r...@hp.com> wrote:
>
> Putting things in writing and disclosing it to the public is a risky
> undertaking!
>
> Best wishes,
> Hugh
>
Hi, thanks for the comments. A bit more details about the boards and the
measurements.
DDS board1 is an AD evaluation kit AD9912A/PCBZ which is fed a 1 GHz SYSCLK
generated on another evaluation board EVAL-ADF4350EB1Z.
The FTW is written over SPI-bus from an Arduino.
DDS board2 is an ARTIQ
Hi
There are indeed TCXO’s out there that have exactly the same crystals in them
as OCXO’s (other than the cut angle). They are not super common. AT based
OCXO’s are not as popular as they once were. Large(r) package / high price
TCXO’s also are not what most people go out and buy.
All that
Joe Hobart writes:
> Your accuracy results are impressive. I have questions:
>
>What manufacture or brand DS3231 do you have?
There are two modules you can get easily from the usual places, prices
and delivery times vary wildly. The first and larger variant used to be
called ZS-042, but now
Here is a write up from when I attended the NIST Time & Frequency Seminar
last year (2018). Coincidentally, I had just had a tour of the NIST T
facilities a month or two before as part of another event. In the
spirit of full disclosure: I’m an embedded software developer who
routinely deals with
On Sat, 26 Jan 2019 00:32:46 +0100
Magnus Danielson wrote:
> > Sounds easy. But, Novatel has four fixed (TCXO, OCXO, rubidium,
> > cesium) plus a USER specifications to model the external clock
> > performance. Each model specifies three coefficients of the power law
> > spectral density (h-2,
On Wed, 23 Jan 2019 17:31:04 -0500
Bob kb8tq wrote:
> If you take a look at typical TCXO’s and XO’s in a real world environment,
> their noise is higher than a similar
> OCXO even at 100 Hz. If you are cleaning up something like a Rb, your loop
> may well be below 1Hz.
I always assumed,
On Sun, 17 Feb 2019 00:49:58 +
Mark Sims wrote:
> The two candidates for the F9P are "add current sawtooth" or "subtract
> previous sawtooth". I had been favoring "subtract previous" but some more
> detailed analysis seems to favor "add current". The difference between the
> results of
Hi Anders,
On 2019-02-18 14:47, Anders Wallin wrote:
Hi all,
We've tried to measure the 1e9/2**48 = 3.55uHz frequency resolution of an
AD9912 DDS (clocked at 1GHz SYSCLK), but found that the output corresponds
to an FTW with the LSB set to zero.
Results around 10MHz output, where we expect a
On Fri, 15 Feb 2019 23:06:36 -0800
"Tom Van Baak" wrote:
> > Mother of God, John, what makes this meeting worth the price?
>
> Yes, it sounds high but perhaps not out of line for multi-day professional
> conferences / seminars these days. True, you have to factor in Denver flights
> and
Hi,
Are you losing the least significant digit in your frequency measurement? A
double precision word has 52 bits of significance+sign, roughly corresponding
to 15 decimal places. Adding 3uHz to 1Ghz (or hundreds of MHz) is just about
on the limit of generating significance errors due to
Hi
Over the course of decades, we sent a lot of people to this workshop. It was
typical to
have a new engineer head out to it after a year or so on the job. I don’t
remember any of
them coming back saying that they had found it all way past their ability to
comprehend.
Compared to doing the
Hi all,
We've tried to measure the 1e9/2**48 = 3.55uHz frequency resolution of an
AD9912 DDS (clocked at 1GHz SYSCLK), but found that the output corresponds
to an FTW with the LSB set to zero.
Results around 10MHz output, where we expect a step of 3.55 uHz for each
step of the FTW, but instead see
I'm actually debating on whether to attend this or not. I really
need to understand a lot of the things related to time and Frequency
better, and it looks like this covers pretty much all of the bases.
The price, although high, isn't out of the range of expectations for
this type of workshop.
On 10/2/19 11:18 pm, Rice, Hugh (IPH Writing Systems) wrote:
> The AC transformer in the 5061A/B was from HPs transformer organization (HP
> actually made their own transformers for many years), and whoever designed
> the original power system left a lot of "brown out" margin in the system.
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