[GPS_Standard] Crystek OCXO

[Bert, VE2ZAZ]

Hi Guys,

A couple of quick comments (I am at work right now...).

There is everything required on the board for a 0-10 V tuning range. Only an 
external supply is required. Consult Table 1 in the article.

This OCXO will most likely work. The only thing to say is that the 
end-to-end tuning range is 10-15 Hz. The maximum range I have tried is 10Hz. 
So tuning will be a bit coarser. If you happen to have it in your hand, try 
it. Worse case, it won't work very well. Not a big deal; you can shop for 
another one later.

Cheers,

Bert, VE2ZAZ


>From: "michael taylor" <mctylr at gmail.com>
>To: "David M. Witten II" <wittend at wwrinc.com>
>CC: gps_standard at mailman.qth.net
>Subject: Re: [GPS_Standard] Crystek OCXO
>Date: Tue, 29 Jan 2008 14:56:03 -0500
>
>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
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