[Lowfer] Any use?
Ed Phillips
[email protected]
Thu, 21 Feb 2002 07:43:44 -0800
Ashlock,William wrote:
>
> Ed,
>
> Not sure what the normal xtal oscillator stability should be. No experience
> with oscillators other than this one and it appears to be under .2 Hz over a
> weeks time. I'm referring to the divided down freq (185.300), not the xtal
> freq. Is that what "your couple of Hz" refers to, as well? If so, this would
> be a bit large for QRSS60, where the whole ARGO window is about 3Hz. QRSS30
> wouldn't be too bad.
Yep. That drift is at the output frequency. Using a 32:1 CMOS divider
from a re-ground FT-241 crystal at about 5800 kHz in a room where the
temperature varies by at least 10� over the period of a day. Not
exactly a modern setup, but it has been sitting here putting along for
almost 25 years, and was plenty good enough "in the old days". Have
some very high precision 2 MHz ovenized crystals which I could use as a
reference for a synthesizer IF I got the ambition.
Ed