[time-nuts] Improving the stability of crystal oscillators

Brooke Clarke brooke at pacific.net
Thu Oct 11 15:58:38 EDT 2007


Hi Tom:

Very interesting.  How about  building a circuit to drive those GR crystals?

The same man is the inventor of all four of the early GR patents, James Kilton 
Clapp, of   "Clapp Oscillator" fame.
http://en.wikipedia.org/wiki/Clapp_oscillator
In the 1930s GR patents he's showing an inductor in series with the crystal and 
Wiki dates the "Clapp Oscillator" 1948 where a capacitor is in series.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam

Tom Van Baak wrote:
> 
> Maybe because it was written back in 1930's, but one of the better
> discussions of quartz temperature control, including considerations
> of insulation and isothermal layers (attenuation and conduction)
> are in the patents for the old double oven General Radio frequency
> standard:
> 
> http://www.leapsecond.com/museum/gr676b-50kc/
> http://www.leapsecond.com/museum/gr676b-50kc/US1967185.pdf
> 
> /tvb
> 
> 
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