[time-nuts] 10811 crystal orientation

Robert Atkinson robert8rpi at yahoo.co.uk
Wed Jul 8 20:43:58 UTC 2009


Hi Antonio,
Have a look at http://www.realhamradio.com/GPS-oven-journey.htm for internal pictures.
The crystal element is a disc mounted parallel to the flat end of the can, see http://www.bliley.com/index_088.htm

Robert G8RPI.

--- On Wed, 8/7/09, iovane at inwind.it <iovane at inwind.it> wrote:

> From: iovane at inwind.it <iovane at inwind.it>
> Subject: Re: [time-nuts] 10811 crystal orientation
> To: "time-nuts" <time-nuts at febo.com>
> Date: Wednesday, 8 July, 2009, 7:01 PM
> Hi Chad,
>  
> the sketch you sent seems to indirectly answer my question,
> as I could rely on the axis of minimum "g" sensitivity to
> orient my three 10811 assemblies, but for my purpose it
> seems that there is still a margin of ambiguity. I don't
> take from the sketch how the crystal is actually fitted
> (vertically?) into the case. As far as I know, "g"
> sensitivity depends mainly on how the crystal "weights" on
> its suspensions (contacts), and this is secondary for me.
> So, I would be pleased to know how the crystal is actually
> oriented, say regardless of the "g" sensitivity.
> 
> Thanks.
> Antonio I8IOV
> 
> > Hi Antonio,
> > 
> > Please see the attached diagram from the 10811A
> service manual.  Minimum and
> > maximum G-sensitivity axes are shown.  Since the
> other variants of 10811 are
> > all internally constructed the same, I would not
> expect a difference for the
> > -60111.
> > 
> > - Chad.
> > 
> > 
> > 
> > On Wed, Jul 8, 2009 at 10:27 AM, iovane at inwind.it
> <iovane at inwind.it>
> wrote:
> > 
> > > Dear all,
> > >
> > > does anybody out there know the orientation of
> the crystal faces relative
> > > to the outer case in a 10811-60111?
> > >
> > > (The sense of the question is that we are
> considering building a 3-axis
> > > apparatus for gravity-related tests. Note, based
> on our tentative
> > > modelization, crystals are not requested to work
> as accelerometers).
> > >
> > > Antonio I8IOV
> 
> 
> 
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