[GPS_Standard] Crystek OCXO

[michael taylor]

On Jan 29, 2008 2:00 PM, David M. Witten II <wittend at wwrinc.com> wrote:
> The Crystek documentation claims the following:
>
>         Tuning range +-1 ppm (min) to +-1.5 ppm (max)
>           over a 0 vdc (min) +5 vdc (typ.) +10 (max) control range
>         Phase noise:
>                  -102 dBc/Hz @ 10 Hz offset

No frequency stability? Seems an odd parameter to omit for an OCXO.

> Is there anything anyone can suggest that I should consider about this
> strategy?  How would I map the control voltage range to the -5v to +5v
> range without introducing error?

I think you mean convert the VE2ZAZ's EFC output of -5 to +5V to the 0
to +10V of the EFC used by the crystal (with 5V being the normal
'middle' value.

Using op-amps to translate the levels would be one way. Here is an
example for mapping [0, 5] to [-5, 5] which you should be able to
adapt for your needs.
<http://www.febo.com/pipermail/time-nuts/2007-December/028752.html>

-Michael