[time-nuts] FA2 internal OCXO orientation sensitivity

[Didier Juges]

If it is sensitive to orientation, it is probably also sensitive to
vibrations, so mobile applications may be out of the question, depending on
your needs.

Didier KO4BB

On Mon, Oct 7, 2019 at 2:00 AM Mark Sims <holrum at hotmail.com> wrote:

> The first time that I tried to set the FA2 internal oscillator frequency I
> tilted the case so that the screen was facing down and the adjustment screw
> was facing up.  I got it on frequency, but when I placed the unit with the
> bottom of the case facing down the oscillator was 0.032 Hz off.  So I did
> some more testing with the case in various orientations.  It looks like the
> frequency is fairly insensitive to orientation except for tilt in the
> front-back axis where it is around +/-1 milliHertz per 3 degrees of tilt
> (which seems rather high to me).  If you are using the FA2 in a mobile
> application pay close attention to the front/back tilt of the case.
>
>    F:0010000000.001619430  bottom down
>    F:0010000000.001687723
>    F:0010000000.001946380
>    F:0010000000.001902348
>    F:0010000000.001692710
>    F:0010000000.001663366
>    F:0010000000.001712156
>    F:0010000000.001760899
>    F:0010000000.001590295
>    F:0010000000.001648737
>
>    F:0010000000.001922004 bottum up
>    F:0010000000.002214679
>    F:0010000000.002209653
>    F:0010000000.002063463
>    F:0010000000.001912133
>    F:0010000000.002556087
>    F:0010000000.002775519
>    F:0010000000.002053697
>    F:0010000000.002014587
>    F:0010000000.001570725
>
>    F:0010000000.033927950 screen down
>    F:0010000000.033435257
>    F:0010000000.032562128
>    F:0010000000.032625399
>    F:0010000000.032098574
>    F:0010000000.032225335
>    F:0010000000.032391257
>    F:0010000000.032571790
>    F:0010000000.032922928
>
>    F:0009999999.971298357  screen up
>    F:0009999999.967820455
>    F:0009999999.967859533
>    F:0009999999.967986393
>    F:0009999999.967800925
>    F:0009999999.967947314
>    F:0009999999.968327835
>    F:0009999999.968252960
>    F:0009999999.968030373
>
>    F:0009999999.998658455  left edge down
>    F:0009999999.998985308
>    F:0010000000.000419484
>    F:0010000000.002063510
>    F:0010000000.003292634
>    F:0010000000.003956045
>
>    F:0010000000.002448722  left edge up
>    F:0010000000.002029197
>    F:0010000000.001917045
>    F:0010000000.001985357
>    F:0010000000.002012571
>    F:0010000000.001980588
>
>
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