Hi
I suspect it would indeed work. The database would not need to be very fancy.
Bob
On Jan 9, 2011, at 12:27 PM, scmcgr...@gmail.com wrote:
> Have you thought of using RRD (Round Robin Database).
>
> RRD is a CSV format which stores value vs time and is generally used for
> archiving network
Hi
The spec they were after was a warmup to "on frequency +/- 1x10^-8" from -40 C
sort of thing. I believe the warmup time was under 15 minutes, but I don't
know the exact number.
Bob
On Jan 9, 2011, at 8:43 PM, Mike S wrote:
> At 06:36 PM 1/9/2011, Tom Van Baak wrote...
>> The outer oven
At 07:59 AM 1/10/2011, Bob Camp wrote...
The spec they were after was a warmup to "on frequency +/- 1x10^-8"
from -40 C sort of thing. I believe the warmup time was under 15
minutes, but I don't know the exact number.
Nope. It was only spec'd for operation from 0-50C. It was required to
achi
IMHO, The dual oven 10811 oscillators I've seen are not designed as some
hack JUST to do a quick warm-up.
The six sided heater and all the trouble they went thru to insulate the
inside oven from any effects from the outside is a design meant to keep the
inside oven highly isolated from wide am
Hi
Obviously none of the -40 stuff made it into the final Z3801 specification.
>From the stories I've heard, it was indeed part of the initial developmental
goal. There were several customers beyond Nortel in the running early on.
The whole idea of un-heated (outdoor box) "nano cells" was around a
Bob Camp wrote:
the story to remember that sort of detail.
>
> I've never seen any frequency vs temperature data on the "double oven"
> 10811's that shows they are significantly better than a normal part. HP
> apparently never published any data. They also never used the approach
> again, despite i
It is perhaps wise to remind ourselves at this point that the designers'
approach was "good enough" whereas the typical time-nut's approach is "as
good as it can possibly be."
On Mon, Jan 10, 2011 at 1:58 PM, Rick Karlquist wrote:
> Bob Camp wrote:
> the story to remember that sort of detail.
Designers want good enough at the lowest cost. This oven design sounds
complicated.
-Original Message-
From: "William H. Fite"
Sender: time-nuts-boun...@febo.com
Date: Mon, 10 Jan 2011 14:04:20
To: ; Discussion of precise time and frequency
measurement
Reply-To: Discussion of precise t
li...@lazygranch.com wrote:
> Designers want good enough at the lowest cost. This oven design sounds
> complicated.
I was not cheap, it was not high performance, it was not elegant.
But it did get product shipped on time.
Rick
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Would a TSB (Tab Separated Value) format be preferable? Full-stops
and commas are used in numbers as decimal and thousands separators (or
vice versa), so using tab character would avoid any problems with
commas in the actual data (and make it is a bit easier to quickly
eyeball when viewed in a tex
We have mountains of data here too. The best why to store it is in a
"real" database of some kind. There are several that are free, open
source and multi-platform. The best for this use is "Postgres". As
this is free and open source there is no reason not to use it.
In the past I've kept snap
--- On Sat, 1/8/11, Magnus Danielson wrote:
...
> >> How will the input side work? How will you handle
> input
> >> signals of various kinds? In particular sine of
> various
> >> amplitudes and frequencies. Slew-rate can be a
> limiting
> >> factor as white noise will convert into jitter if
>
The counter argument is with a heavyweight database - the size of the datastore
increases dramatically and there is no guarantee that the tool will be around
in 10 years to read the data.
All SQL databases use ASCII format CSV to load and dump the data from their
internal data representation.
There is a difference between archival format and database format. If you
are looking for an archival format that is portable, then a CSV (or other
delimiter of your choice) is ideal. They are easy to import to a real
database and compress well. If, on the other hand, you are looking for a
working
On Mon, Jan 10, 2011 at 2:08 PM, Bob Bownes wrote:
> There is a difference between archival format and database format. If you
> are looking for an archival format that is portable, then a CSV (or other
> delimiter of your choice) is ideal. They are easy to import to a real
> database
If it needs
On 1/10/2011 1:42 PM, Tijd Dingen wrote:
...
I read up on it on Bruce's site. At least I think it is Bruce's site, what with the
"/~bruce/" in the url. ;)
...
regards,
Fred
I assume you mean: http://www.ko4bb.com/~bruce
That is not Bruce's site, rather DIDIER's site. Didier has been very
Hi
In a normal industrial setting, one would make a few decisions and start
pushing data in a direction.
In this case, I'd like to look at *everybody's* data. That makes a bit more
complex problem. If it's an "archive and import" approach, the process has
to work on autopilot. Customizing the im
You saved me a lot of typing. :) Comments inline...
--- On Mon, 1/10/11, Bob Bownes wrote:
> From: Bob Bownes
> Subject: Re: [time-nuts] Archiving Timing Data
> To: scmcgr...@gmail.com, "Discussion of precise time and frequency
> measurement"
> Date: Monday, January 10, 2011, 10:08 PM
> There
That was indeed the site I meant. I stand corrected. :)
--- On Mon, 1/10/11, Rex wrote:
> From: Rex
> Subject: Re: [time-nuts] No State Of The Art Counter
> To: "Discussion of precise time and frequency measurement"
>
> Date: Monday, January 10, 2011, 10:42 PM
> On 1/10/2011 1:42 PM, Tijd Di
List,
While comparing oscillators at 10 GHz might work for some it is indeed a
daunting challenge at the very least.
I would like to propose what may be cheaper and more readily achieved method
for Comparing 10 MHz Oscillators by more of us time-nuts. (This is still
theoretical)
What I propo
List,
Wrote: It was not cheap, it was not high performance, it was not elegant. But
it did get product shipped on time.
“In the land of the blind the one eyed man is king”
Rick,
All your statements are most likely 100 percent accurate. You are the expert.
The problem for the rest of us is th
Perry Sandeen wrote:
List,
While comparing oscillators at 10 GHz might work for some it is indeed a
daunting challenge at the very least.
I would like to propose what may be cheaper and more readily achieved method
for Comparing 10 MHz Oscillators by more of us time-nuts. (This is still
the
List,
Wrote:< I have no problems with my 10811. I just want to experiment with ways
to improve performance, right now I have several that are in the E-13
YES!
Regards,
Perrier
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Would someone mind posting the manual for this? I have a dead one in the
closet that needs my attention and I'm not quite sure where to start. The
power supply works, but no other signs of life.
Thanks,
Chris Erickson
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