[time-nuts] G P S D O

[Ray Hudson]

Brian use PDF999    http://www.pdf995.com/ its a printer driver that prints to PDF file. When installing it just untick all the other junk it wants to install. You get a few of ads when using it but its free otherwise.

Ray.

--- On Thu, 29/10/09, Brian Kirby <kilodelta4foxmike at gmail.com> wrote:

> From: Brian Kirby <kilodelta4foxmike at gmail.com>
> Subject: [time-nuts] G P S D O
> To: "precise time" <time-nuts at febo.com>
> Received: Thursday, 29 October, 2009, 2:32 PM
> I have attached a plots of various
> GPSDO's compared against a HP5065A rubidium.
> 
> The first plot is of a HP Z3801A.  The left scale
> spans 36 nanoseconds.
> 
> The second plot is of a Trimble Thunderbolt, its running
> default 100 second time constant with a 1.2 damping
> factor.  Its from the group purchase.  I changed
> the scale to span 36 nanoseconds.
> 
> The third plot is of Efratom FRS-C rubidium that is
> controlled by the Shera Controller, and its GPS source is an
> older Motorola Oncore VP, ver 10.  The scale
> spans   36 nanoseconds.  Bear in mind
> this was not his stock PIC, but a PIC that we modified for a
> rubidium.  His stock PIC had a update rate of 30
> seconds, we tested units at 60, 120 and 240 seconds and
> settled on 120 seconds after the preliminary
> data.   The time constant was set up for mode
> 7, I believe that works out to  the proportional
> controller time constant around 1/3 of a day  (I'll
> have to find the paperwork and run the calcs).
> 
> I tried to present some information earlier, but the only
> instrumentation I had was a HP 53131A, with TAC32, and a
> Efratom FRK-L for reference.  At that time I did not
> have the computing horsepower, plotting capability or some
> more serious instrumentation.
> 
> The instrumentation used in these plots was a HP 5370B, it
> baselines at 2x10-11 at one second and drops a magnitude for
> every decade in tau.  The recording was done via a
> Prologix GPIB USB adapter and HyperTerminal in
> Windows.  The plots were generate in DF6JB/Ulrich's
> Plotter program (thanks !).
> 
> After generating the plots, I scanned them into PDF at 200
> DPI to save bandwidth.  I have not been able to
> generate PDF's directly inside of Plotter.  I use
> version 6 of PDF and it takes an internal error.  AT
> the present, I cannot afford to upgrade it.
> 
> I bought a Fury controller a couple of years back and due
> to personal issues I could not put it to use.  My next
> project it to put the Fury on the FRS-C and see how much we
> can smooth it out....
> 
> Brian KD4FM
> 
> -----Inline Attachment Follows-----
> 
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