Hi
The most basic issue you are going to run into is that your counter is not high
enough
resolution / accuracy to give you meaningful data for time intervals under a
few hundred
seconds. I would focus on improving on that part of things before I went off on
a major
“test everything”
MY AIMS
1) Try to learn about the various statistical tests (ADEV, MDEV etc), and
how best to compare oscillators, by making some measurements on various
oscillators I have.
2) Investigate the short/medium term stability of the output of various
bits of test kit. All are locked to GPS by
Hi
The obvious question would be: What does it cost to set up a line to make a
proper
set of spherical Rb cells? Doing this as a glassblowing project is a dead end.
You
need it properly tooled ….
Bob
> On Jan 11, 2017, at 7:05 PM, Bruce Griffiths
> wrote:
>
>
Angus
Read the paper I posted on the current state of the art.
ADEV ~ 2E-13/SQRT(Tau) is feasible with large cells and using a laser instead
of rubidium lamp.In principle, one can use the same cell to lock the laser to
the rubidium absorption line and lock the microwave signal.Suitable laser
Hi
> On Jan 11, 2017, at 6:07 PM, Angus wrote:
>
> On Tue, 10 Jan 2017 21:43:07 -0500, you wrote:
>
>>
>> This does get back to state of the art Rb and what that means. In my
>> suggested case thats measured in terms of ADEV for Tau = 1 to 1,000,000
>> seconds.
On Tue, 10 Jan 2017 21:43:07 -0500, you wrote:
>
>This does get back to state of the art Rb and what that means. In my
>suggested case thats measured in terms of ADEV for Tau = 1 to 1,000,000
>seconds. If you wanted an Rb with (only) state of the art phase noise at 1 MHz
>offset
thats a
Hi
A spherical set of cells is going to be a massive pain to fabricate. I believe
you can hit < 5x10^-12 / sqrt(tau) with
a fairly normal cell design and cavity design. There are some very basic issues
with the photo detector’s S/N that
also tip things towards a coaxial approach.
Bob
> On
Hi
A cryo pump will get you into reliability issues if run 24/7. It also is
doubtful
that you will be able to maintain the vacuum level over long periods.
Bob
> On Jan 11, 2017, at 12:09 AM, Bruce Griffiths
> wrote:
>
> One could always use a cryo pump.
> The
In message <619617e1-aa26-4eb7-b73e-042f22912...@n1k.org>, Bob Camp writes:
>I guess the question then would be:
>
>Is a H Maser that runs 6.6 x 10^-12 at 1 second worth the trouble?
I would say absolutely not.
All things considered, I think a trapped-ion type standard would
be both
In message <0C641805E0824C499D3C15F67F0B880B@pc52>, "Tom Van Baak" writes:
>To keep a maser room within 1 C or 0.1 C takes much more power [...]
Forget the power: Look at the installation costs.
If you want to be able to go in and pat your maser, the air volume
and flow has to be big
Hi Dan,
Everything seems pretty much back to normal this morning. I’ll have to take
another look at yesterdays data to see when that happened. I’ll add a suitable
graph to my site as an example of wide area routing induced offset glitches.
Mike
> Le 11 janv. 2017 à 00:14, d...@drown.org a écrit
After doing some more design work on my WWVB simulator I came up with a DC way
to change output levels from 2 V to 2 uV (p-p). in 20dB steps. That would be at
"full power" output. Reduced output will be 17 dB down from that. Well into the
weeds at low signal levels. That would be quite some
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