Fellow clockers,
I will soon be the proud owner of a Datum 9520-240 desktop time
display, and would like to find a manual for it (preferably with schematics).
Any help?
Thanks much.
-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technolog
Said
Some of the highest resolution techniques for comparing 2 10MHz sources are:
1) Use a Quartzlock A7-MX - resolution 5E-14/tau equivalent to 50 fs at
1 sec.
2) Use the JPL technique: Measure the beat frequency between the 2
oscillators (offset one oscillator by 1Hz using an offset generato
[EMAIL PROTECTED] wrote:
>
> In a message dated 4/7/2007 04:08:20 Pacific Daylight Time,
> [EMAIL PROTECTED] writes:
>
>
> The Wavecrests are wonderful tools, but they address a different problem
> than
> what normal time-nuts usually care about, so they are not a given perfect
> counter fo
In a message dated 4/7/2007 04:08:20 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
The Wavecrests are wonderful tools, but they address a different problem
than
what normal time-nuts usually care about, so they are not a given perfect
counter for long term comparision. It is aimed at j
Ladies and Gentlemen,
I am currently analytically involved in solving two different problems with a
TrueTime XL-DC and a TrueTime GPS-DC.
Schematics for both would be most helpful and efficient but, of course, not
absolutely necessary for a successful diagnosis and corrective action.
If anyone
At 11:38 AM 4/7/2007, Jason Rabel wrote:
>I've discovered that trying to get any schematics from them is impossible,
>even for old / obsolete equipment. But they love to comment on how you
>should upgrade to their latest piece of hardware. ;)
Why? So you have something that is way more expensive a
I *think* the XL-DC might still have some current links on the Symmetricom
site.
I've discovered that trying to get any schematics from them is impossible,
even for old / obsolete equipment. But they love to comment on how you
should upgrade to their latest piece of hardware. ;)
Do you have a spe
In message <[EMAIL PROTECTED]>, "Tom Van Baak" writes:
>Now, at much larger tau I would expect the three lines
>to merge as something else becomes the limiting factor,
>but that's well over tau 10^6 seconds.
Actually, it's already about 2e5 seconds where the repetition
pattern of GPS satellites t
On Sat, April 7, 2007 13:08, Tom Van Baak said:
> Improving the Performance of Low Cost GPS Timing Receivers
> ftp://ftp.cnssys.com/pub/PTTI/PTTI_2006.pdf
>
> You'll see the nice plot comparing h/w and s/w on page 15.
> They also did a linearity test. Good paper; read it all.
How about GPS Adev u
> Tom
>
> Is there anyway that you can derive the same plot for an M12+ receiver
> with post facto (software) sawtooth correction?
> It should be marginally better than a CNS II. Hardware correction always
> adds some noise. Some of the Dallas programmable delay chips used in the
> CNS II are n
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] Looking for Wavecrest Visi
Date: Sat, 7 Apr 2007 08:59:28 +0200 (CEST)
Message-ID: <[EMAIL PROTECTED]>
> On Sat, April 7, 2007 8:38, [EMAIL PROTECTED] said:
>
> > BTW: not sure why these units are not so popular on this list, they have
> > picoseco
Tom Van Baak wrote:
> John,
>
> I like the questions you ask. Here's an updated plot:
>
> http://www.leapsecond.com/pages/3gps/gps-adev.gif
>
> Note that the tau 1 second Allan deviation is essentially
> the standard deviation of the sawtooth: in the graph the
> VP is about 55 ns, CNS about 15 ns,
John,
I like the questions you ask. Here's an updated plot:
http://www.leapsecond.com/pages/3gps/gps-adev.gif
Note that the tau 1 second Allan deviation is essentially
the standard deviation of the sawtooth: in the graph the
VP is about 55 ns, CNS about 15 ns, CNS2 about 3 ns.
(CNS is an M12+; t
In a message dated 4/7/2007 00:00:25 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
On the only "time-nut visit" I have done, the nut was VERY proud of his
Wavecrest! You do not think the userbase is limited by pricelevel and
availability?
Hi Bjoern,
there is one on Ebay today for $9
On Sat, April 7, 2007 8:38, [EMAIL PROTECTED] said:
> BTW: not sure why these units are not so popular on this list, they have
> picosecond cable-length measurement which is fantastic to measure Antenna
[...]
On the only "time-nut visit" I have done, the nut was VERY proud of his
Wavecrest! You
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