[time-nuts] Making a HP 10811 better

[Tom Van Baak]

> This is mentioned in the HPJ article on the 10811.
> (Required reading for anyone playing with 10811's).
> 
> Rick Karlquist N6RK

Indeed. For the rest of you please note the cover photo is
worth it even if you don't read the article:

"SC-Cut Oscillator Offers Improved Performance"
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1981-03.pdf

---

IIRC this is one of the articles that mentions in passing that
the 10811 (SC-cut) isn't actually operated at the turn-over
point, something, I think, that was more important for AT cuts.
I'm looking for the other paper I read recently that discussed
this aspect of the SC-cut.

---

Speaking of turn-over points. Some crystal cuts have both a
low temperature and high temperature turn-over point. Does
anyone know of a crystal oscillator that is specifically operated
at the low temperature point (and I'm not talking about exotic
cryo sapphire here)? Maybe something around -20 C. In the
range of a TEC cooler at least.

The reason for the interest is that it seems to me some of the
oscillator characteristics (such as drift or phase noise) might
be related to temperature, in which case a well-below ambient
temperature is better than a well-above ambient temperature,
even if it complicates the packaging or thermal regulation.

/tvb