Harold M Hallikainen wrote:
> Also, remember that setting a 12 MHz oscillator to
> within 1 Hz means it isn't going to stay there.
> That's 0.1 ppm. Really good crystal oscillators
> (with temperature compensation or ovens) can maybe
> do 1 ppm or so.

Yes, from Electronicstalk.com:

"The FTS501AH OCXO offers a frequency stability of
+/-250ppb over the standard temperature range of 0 to 70C"

(ppb = 1000 ppm ?)

 Mike.


News article from Electronicstalk.com
____________________________________________________________

OVEN-COMPENSATED CRYSTAL HOLDS FORM FOR TELECOMMS
____________________________________________________________

Date: 9 August 2002
News from: Fox Electronics
Product: FTS501AH
http://www.electronicstalk.com/news/fox/fox107.html

The FTS501AH OCXO (oven-compensated crystal oscillator) meets
stratum level accuracy requirements for telecommunications
applications, making it ideal for use in basestations, telecomms
switching, GPS and LAN/WAN applications as well as in test and
satellite equipment. This is the latest product developed and
manufactured at Fox's Customer Technology Centre (CTC), based at
the company's headquarters in Fort Myers, FL. The FTS501AH OCXO
offers a frequency stability of +/-250ppb over the standard
temperature range of 0 to 70C and an overall accuracy of
+/-4.6ppm for all conditions over 10 years. Frequency range of
the new OCXO is 10 to 40MHz. Supply voltage is 5.0V, with 3.3V
available, and control voltage is 0.5 to 5.0V. Storage
temperature range is -40 to 85. In addition to the 14-pin DIP
configuration, Fox's new oscillators are offered in a variety of
different packaging and stabilities, based on customer
requirements. The OCXOs are also available in CMOS and sinewave
versions. Pricing for the new FTS501AH OCXOs begins at $68 each
in quantities of 1000. Delivery is 8 weeks ARO, depending on
frequency.

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