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Subject: Re: Constant Frequency at LOW temperature
Date: Thu, 7 Nov 2002 23:17:43 +0000
NNTP-Posting-Date: Thu, 7 Nov 2002 23:22:38 +0000 (UTC)
User-Agent: Turnpike/6.01-U ()
In message , Bill Sloman
>"Tom Bruhns" wrote in message
>> "Bill Sloman" wrote in message
>> > "Arch-lab" wrote in message
>> > 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.
>> I know Bill well enough to believe this was a slip of the fingers on
>> the keyboard...what he describes is an OCXO: oven controlled crystal
>> (xtal) oscillator. TCXO (temp. compensated, not controlled) has parts
>> which compensate the known temperature drift of the oscillator
>> circuit; some these days do it digitally. An advantage of a TCXO over
>> an OCXO is that it generally takes less power; the oven, especially
>> when ambient is very cold, takes power. Another advantage is that the
>> TCXO turns on quickly, while the OCXO takes some time to stabilize,
>> again more so at cold ambient. At least, those (TCXO; OCXO) are the
>> common terminologies you'll find in crystal vendors' literature.
>Thanks Tom - my crystal vendor's books were all at work, and the slip was a
>failure of memory. Apologies to all.
>Bill Sloman, Nijmegen
Is it possible that the requirement is not only for temperature
stability but also pullability.
Locking to planets would require a different frequency than stars, how
The best crystal oscillators will only pull 1ppm so perhaps DDS (direct
digital synthesis) is the way to go.
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