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Subject: Re: Constant Frequency at LOW temperature
Date: Sun, 3 Nov 2002 22:47:47 +1100
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
I trust you don't intend to charge a consultancy fee to this client when
your professional skill is limitted to asking an NG without even first
establishing the major parameters?
"Arch-lab" wrote in message
> Feq. isn't pinned down yet since my client hasn't told me yet what the
> ratios are that they are building. However, the application will use a
> stepper. As far as accuracy, basically it will have to be able to keep up
> with the sky (telescope tracking).
Hardly a spec!
> "Bill Sloman" wrote in message
> > "Arch-lab" wrote in message
> > > Hi
> > >
> > > I haven't worked on this type yet... I need to create a nice stable
> > > frequency for a stepper... problem is that it will need to have the
> > > frequency at -30 degrees C.
> > >
> > > What technology / theory should I be looking up for this design.
> > TCXO - a temperature controlled crystal oscillator. You stck the crystal
> > a little oven and use a thermostat to make sure that the cyrstal and the
> > inside of the oven sit at about 50C or 70C.
> > The parts are commercially available.
> > Of course, you first have to work out what you mean by a "nice stable
> > frequency". For some applications, you might need an atomic clock as
> > (and available from) the Global Positioning System.
> > Give us some numbers, or a description of your application, and we might
> > able to be more helpful.
> > ------
> > Bill Sloman, Nijmegen
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