There is a new product out which makes even greater claims:

http://www.ambient.de/Trilevel_lockit_instWS.pdf

This is a relevant quote from that fairly large pdf:

"The Lockit box 202C and 202T produce timecode at under one frame in 24
hours drift. Video sync is locked to that. Accuracies between boxes are
better than 0.5 ppm from minus 10 to plus 40 degree C (14F-104F).
Calibration will hold to under one ppm for over one year. The Lockit box
is unique because its crystal can be calibrated in the field to better
than 0.2 PPM to match other generators."

I'm really curious as to how they would achieve that much precision
in a small field unit.

Bruce Douglas

Robert Rolf wrote:
 > http://www.nagrausa.com/NAGRA_IV.htm
 > "Time code generator stability:
 >
 > +/- 1 ppm from -10 to +40=B0 C corresponding to a variation
 > ^^^^^^^^^^
 > of +/- 1 frame in 9 hours of operation at 30fps or in 11 hours
 > at 25fps (+/- 2 ppm from -10 to +60=B0 C) "
 >

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